Quiz 6: Applications of Newtons Laws
Physics & Astronomy
Q 1Q 1
You are driving in your car with a sack of groceries in the seat next to you. You see a light change and you slow down and the sack remains on the seat. Suddenly the car in front of you slams on the brakes, and you are forced to brake harder. The groceries slide off the seat. Explain what happened.
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Essay
At the lower deceleration the frictional force required to decelerate the sack of groceries was below the maximum static friction between the sack and the seat,but at the higher deceleration the frictional force was not sufficient,so the sack slid.
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Essay
The net force acting on the object must be zero.
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Essay
Yes,although the speed is constant,the direction of the velocity can be changing.
Q 4Q 4
An airplane is flying with constant speed along a horizontal circle. Is the direction of its acceleration constant?
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Essay
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Q 6Q 6
You are driving your car and set your sunglasses on the dashboard. When you make a left turn, the sunglasses go sliding off to the right. Explain.
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Essay
Q 7Q 7
The force of kinetic friction between two surfaces is dependent on the relative speed of the two surfaces.
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True False
Q 8Q 8
The force of kinetic friction between two surfaces is independent of the area of contact between the surfaces.
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True False
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True False
Q 10Q 10
The force of static friction between two surfaces is independent of the area of contact between the surfaces.
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True False
Q 11Q 11
The force fo static friction between two surfaces is parallel to the surface of contact, and in in the direction that opposes relative motion.
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True False
Q 12Q 12
An ideal pulley changes the direction of the tension in a string without changing its magnitude.
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True False
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True False
Q 14Q 14
When an object is in translational equilibrium, the net force acting on the object is non-zero.
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True False
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True False
Q 16Q 16
For uniform circular motion, the velocity and acceleration vectors are perpendicular to each other at every point in the path.
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True False
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True False
Q 18Q 18
The banking angle for a properly banked curve does not depend on the mass of the car going over it.
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True False
Q 19Q 19
When a curve is properly banked a passenger in a car traveling on it at the designed speed does not feel a lateral force.
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True False
Q 20Q 20
An object moving along a curved path with constant speed does not have a net force acting on it.
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True False
Q 21Q 21
Its more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because
A) The normal force is greater when the carton is at rest.
B) μs < μk.
C) Initially, the normal force is not perpendicular to the applied force.
D) μk < μs.
E) μs = μk.
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Multiple Choice
Q 22Q 22
A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that
A) a frictional force is acting on it.
B) a net downward force is acting on it.
C) a net upward force is acting on it.
D) it is not acted on by appreciable normal force.
E) it is not acted on by appreciable gravitational force.
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Multiple Choice
Q 23Q 23
If a car slows down with the wheels rolling, is the frictional force between the tires and the ground kinetic or static?
A) kinetic
B) static
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Multiple Choice
Q 24Q 24
When a car goes around a curve, it has a tendency to skid outwards. Is the frictional force between the tires and the ground that keeps the car from skidding kinetic or static?
A) kinetic
B) static
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Multiple Choice
Q 25Q 25
A flatbed truck is carrying a crate along a level road. The coefficient of static friction between the load and the bed is 0.40. The truck accelerates forward and the crate stays in its place on the truck bed. In what direction is the force that the bed exerts on the crate?
A) forward
B) backward
C) toward the center of the road
D) There is no frictional force because the crate does not move with respect to the bed.
E) There is not enough information to answer this question.
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Multiple Choice
Q 26Q 26
As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is
A) static friction.
B) kinetic friction.
C) a combination of static and kinetic friction.
D) neither static nor kinetic friction, but some other type of friction.
E) It is impossible to tell what type of friction acts in this situation.
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Multiple Choice
Q 27Q 27
FIGURE 6-1
-In Figure 6-1, the block of mass m is at rest on an inclined plane that makes an angle θ with the horizontal. The force of static friction f must be such that
A) f > mg.
B) f > mg cosθ.
C) f > mg sinθ.
D) f = mg cosθ.
E) f = mg sinθ.
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Multiple Choice
Q 28Q 28
FIGURE 6-1
-In Figure 6-1, the block of mass m is at rest on an inclined plane that makes an angle θ with the horizontal. The normal force F acting on the block must be such that
A) F > mg.
B) F > mg cosθ.
C) F > mg sinθ.
D) F = mg cosθ.
E) F = mg sinθ.
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Multiple Choice
Q 29Q 29
FIGURE 6-2
-In Figure 6-2 the scale at left is attached to the ceiling and a mass of 1.00 kg hangs from it. It reads 9.81 N. The identical scale at the right is connected by perfect strings passing over perfect pulleys to two 1.00 kg masses hanging vertically at the end of the strings. The scale at right reads
A) exactly 9.81 N.
B) more than 9.81 N, but not quite twice as much.
C) less than 9.81 N.
D) exactly 19.62 N.
E) more than 19.62 N.
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Multiple Choice
Q 30Q 30
FIGURE 6-3
-Compare the two situations shown in Figure 6-3. On the left (A), James is holding the rope and keeping the bucket at rest. On the right (B), James ties the rope to the bucket so that it keeps the bucket at rest. In both cases the bucket contains the same quantity of water. In what case is the tension in the rope higher?
A) left
B) right
C) It is the same in both cases.
D) We need more data to answer.
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Multiple Choice
Q 31Q 31
FIGURE 6-4
-A 16-kg fish is weighed with two spring scales, each of negligible weight, as shown in Figure 6-4. What will be the readings on the scales?
A) The bottom scale will read 16 kg, and the top scale will read zero.
B) The sum of the two readings will be 32 kg.
C) The top scale will read 16 kg, and the bottom scale will read zero.
D) Each scale will show a reading greater than zero and less than 16 kg, but the sum of the two readings will be 16 kg.
E) Each scale will read 8 kg.
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Multiple Choice
Q 32Q 32
FIGURE 6-5
-Two masses, m1 and m2, are connected to each other as shown in Figure 6-5. Mass m1 slides without friction on the table surface. Both masses have acceleration of magnitude a as shown. How does the tension in the string compare to the weight, m2 g, of mass m2?
A) The tension is equal to m2 g.
B) The tension is larger than m2 g.
C) The tension is smaller than m2 g.
D) It depends on m1 being smaller than m2.
E) It depends on m1 being larger than m2.
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Multiple Choice
Q 33Q 33
FIGURE 6-6
-Two identical masses are attached by a light string that passes over a small pulley, as shown in Figure 6-6. The table and the pulley are frictionless. The masses are moving
A) with an acceleration less than g.
B) at constant speed.
C) with an acceleration greater than g.
D) with an acceleration equal to g.
E) with an acceleration that cannot be determined without additional information.
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Multiple Choice
Q 34Q 34
When an object experiences uniform circular motion, the direction of the acceleration is
A) in the same direction as the velocity vector.
B) in the opposite direction of the velocity vector.
C) is directed toward the center of the circular path.
D) is directed away from the center of the circular path.
E) depends on the speed of the object.
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Multiple Choice
Q 35Q 35
What type of acceleration does an object moving with constant speed in a circular path experience?
A) free fall.
B) terminal acceleration.
C) constant acceleration.
D) linear acceleration.
E) centripetal acceleration.
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Multiple Choice
Q 36Q 36
When an object experiences uniform circular motion, the direction of the net force is
A) in the same direction as the motion of the object.
B) in the opposite direction of the motion of the object.
C) is directed toward the center of the circular path.
D) is directed away from the center of the circular path.
E) is dependent on the speed of the object.
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Multiple Choice
Q 37Q 37
Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity.
A) It is moving in a straight line.
B) It is moving in a circle.
C) It is moving in a parabola.
D) It is moving in a hyperbola.
E) None of the above is definitely true all of the time.
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Multiple Choice
Q 38Q 38
An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors.
A) Both vectors point in the same direction.
B) The vectors point in opposite directions.
C) The vectors are perpendicular.
D) The question is meaningless, since the displacement is zero.
E) The question is meaningless, since the acceleration is zero.
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Multiple Choice
Q 39Q 39
For an object that travels at a fixed speed along a circular path, the acceleration of the object is
A) larger in magnitude the smaller the radius of the circle.
B) in the same direction as the velocity of the object.
C) smaller in magnitude the smaller the radius of the circle.
D) in the opposite direction of the velocity of the object.
E) zero.
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Multiple Choice
Q 40Q 40
A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward
B) 0.5g downward
C) 2g downward
D) g upward
E) 2g upward
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Multiple Choice
Q 41Q 41
A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point?
A) rg
B) 2rg
C) (rg)1/2
D) (2rg)1/2
E) (0.5rg)1/2
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Multiple Choice
Q 42Q 42
The banking angle in a turn on the Olympic bobsled track is not constant, but increases upward from the horizontal. Coming around a turn, the bobsled team will intentionally "climb the wall," then go lower coming out of the turn. Why do they do this?
A) to give the team better control, because they are able to see ahead of the turn
B) to prevent the bobsled from turning over
C) to take the turn at a faster speed
D) to take the turn at a slower speed
E) to reduce the g-force on them
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Multiple Choice
Q 43Q 43
A 55.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300. What horizontal force must be applied to the box for it to start sliding along the surface?
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Short Answer
Q 44Q 44
A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A 140-N force is applied to the box. What is the frictional force on the box?
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Short Answer
Q 45Q 45
FIGURE 6-7
-A 30.0-kg load is being lifted with constant speed using the ideal pulley arrangement shown in Figure 6-7. What is the magnitude of the force F?
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Short Answer
Q 46Q 46
A 30.0-kg load is being raised by a force of 180 N using the ideal pulley arrangement shown in Figure 6-7. What is the acceleration of the load?
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Short Answer
Q 47Q 47
A workman lowers a 30.0-kg load using the ideal pulley arrangement shown in Figure 6-7. He allows the rope to slide in his hands, thus exerting a downward force of 100 N on the rope. What is the acceleration of the load?
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Short Answer
Q 48Q 48
FIGURE 6-8
-Two masses are connected by a string which goes over an ideal pulley as shown in
Figure 6-8. Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal. The coefficient of static friction between block A and the plane is 0.400. What mass should block B have in order to start block A sliding up the ramp?
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Short Answer
Q 49Q 49
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor. The coefficient of static friction between the person's shoes and the floor is 0.700. What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving?
A) 0.333
B) 0.500
C) 0.350
D) 0.667
E) 0.700
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Multiple Choice
Q 50Q 50
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?
A) 0.161
B) 0.188
C) 0.0441
D) 0.0851
E) 0.103
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Multiple Choice
Q 51Q 51
A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
A) 3.92 m/s2
B) 7.84 m/s2
C) 8.00 m/s2
D) 78.5 m/s2
E) 196 m/s2
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Multiple Choice
Q 52Q 52
A flatbed truck is carrying a 20.0-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place?
A) 0.381°
B) 13.1°
C) 21.8°
D) 23.6°
E) 66.4°
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Multiple Choice
Q 53Q 53
A flatbed truck is carrying a 20.0-kg crate up a sloping road inclined 15.0° above the horizontal. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
A) 0.625 m/s2
B) 1.25 m/s2
C) 2.50 m/s2
D) 3.16 m/s2
E) 6.33 m/s2
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Multiple Choice
Q 54Q 54
A flatbed truck is carrying a 20.0-kg crate down a sloping road inclined 15.0° below the horizontal. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
A) 1.25 m/s2
B) 0.625 m/s2
C) 2.50 m/s2
D) 3.16 m/s2
E) 6.33 m/s2
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Multiple Choice
Q 55Q 55
A policeman investigating an accident measures the skid marks left by a car. He determines that the distance between the point that the driver slammed on the brakes and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? (This car was not equipped with anti-lock brakes.)
A) 10.7 m/s
B) 12.8 m/s
C) 21.4 m/s
D) 32.9 m/s
E) 45.7 m/s
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Multiple Choice
Q 56Q 56
A 50.0-kg box is being pushed along a horizontal surface. The coefficient of kinetic friction between the box and the ground is 0.350. What horizontal force must be exerted on the box for it to accelerate at 1.20 m/s2?
A) 60.0 N
B) 116 N
C) 172 N
D) 232 N
E) 491 N
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Multiple Choice
Q 57Q 57
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.400. What is the force of friction on the box?
A) 31.9 N
B) 196 N
C) 217 N
D) 246 N
E) 616 N
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Multiple Choice
Q 58Q 58
A baseball player is running to second base at 5.03 m/s. When he is 4.80 m from the plate he goes into a slide. The coefficient of kinetic friction between the player and the ground is 0.180. What is his speed when he reaches the plate?
A) 4.47 m/s
B) 2.89 m/s
C) 1.96 m/s
D) 2.56 m/s
E) He stops before reaching the plate.
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Multiple Choice
Q 59Q 59
A 50.0-kg box is being pulled along a horizontal surface by means of a rope that exerts a force of 250 N at an angle of 32.0° above the horizontal. The coefficient of kinetic friction between the box and the surface is 0.350. What is the acceleration of the box?
A) 0.638 m/s2
B) 1.74 m/s2
C) 3.16 m/s2
D) 6.31 m/s2
E) 8.53 m/s2
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Multiple Choice
Q 60Q 60
A 50.0-kg box is being pushed along a horizontal surface by a force of 250 N directed 28.0° below the horizontal. The coefficient of kinetic friction between the box and the surface is 0.300. What is the acceleration of the box?
A) 0.769 m/s2
B) 1.77 m/s2
C) 3.16 m/s2
D) 6.31 m/s2
E) 8.53 m/s2
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Multiple Choice
Q 61Q 61
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 20.7° below the horizontal is applied to the box. The coefficient of kinetic friction between the box and the surface is 0.300. What is the acceleration of the box?
A) 1.21 m/s2
B) 1.77 m/s2
C) 2.84 m/s2
D) 3.54 m/s2
E) 5.14 m/s2
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Multiple Choice
Q 62Q 62
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 26.0° below the horizontal is applied to the box. What is the minimum coefficient of static friction between the box and the surface required for the box to remain stationary?
A) 0.441
B) 0.654
C) 0.375
D) 0.866
E) 0.406
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Multiple Choice
Q 63Q 63
A 50.0-kg block is being pulled up a 13.0° slope by a force of 250 N which is parallel to the slope, but the block does not slide up the slope. What is the minimum value of the coefficient of static friction required for this to happen?
A) 0.115
B) 0.566
C) 0.654
D) 0.359
E) 0.292
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Multiple Choice
Q 64Q 64
A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A) 0.528 m/s2
B) 0.158 m/s2
C) 0.412 m/s2
D) 0.983 m/s2
E) 0.260 m/s2
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Multiple Choice
Q 65Q 65
A 50.0-kg block is being pulled up a 15.0° slope by a force of 300 N which is directed 30.0° above the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A) 1.36 m/s2
B) 0.158 m/s2
C) 0.924 m/s2
D) 0.520 m/s2
E) 1.47 m/s2
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Multiple Choice
Q 66Q 66
A 50.0-kg block is being pushed up a 15.0° slope by a force of 300 N which is directed 30.0° below the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A) 0.164 m/s2
B) 0.967 m/s2
C) 1.20 m/s2
D) 2.20 m/s2
E) 0.528 m/s2
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Multiple Choice
Q 67Q 67
A box slides down a 25.0° slope under its own weight. The coefficient of kinetic friction between the box and the slope is 0.350. What is the acceleration of the box?
A) 1.03 m/s2
B) 2.06 m/s2
C) 1.22 m/s2
D) 2.20 m/s2
E) 2.44 m/s2
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Multiple Choice
Q 68Q 68
FIGURE 6-9
-A 22.0-kg crate is pulled along a horizontal floor by the ideal arrangement shown in
Figure 6-9. The force F is 300 N. The coefficient of friction between the crate and the floor is 0.270. What is the acceleration of the crate?
A) 4.17 m/s2
B) 6.57 m/s2
C) 2.34 m/s2
D) 4.85 m/s2
E) 9.65 m/s2
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Not Answered
There is no answer for this question
Q 69Q 69
Diff: 1 Var: 5 Page Ref: Sec. 6-2
-A mass of 40.0 grams is attached to a vertical spring with a spring constant k = 20.0 N/m and lowered slowly until the spring stops stretching. How much does the spring stretch?
A) 0.00200 m
B) 0.0196 m
C) 0.0816 m
D) 0.800 m
E) 0.200 m
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Multiple Choice
Q 70Q 70
A tightrope walker with a mass of 60.0 kg stands at the center of a rope which was initially strung horizontally between two poles. His weight causes the rope to sag symmetrically, making an angle of 4.80° with the horizontal. What is the tension in the rope?
A) 359 N
B) 589 N
C) 1760 N
D) 2470 N
E) 3520 N
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Multiple Choice
Q 71Q 71
A mass of 3.0 kg rests on a smooth surface inclined 34° above the horizontal. It is kept from sliding down the plane by a spring attached to a wall. The spring is aligned with the plane and has a spring constant of 120 N/m. How much does the spring stretch?
A) 360 cm
B) 240 cm
C) 14 cm
D) 24 cm
E) 36 cm
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Multiple Choice
Q 72Q 72
FIGURE 6-10
-A 10-kg sign is held by two ropes as shown in Figure 6-10. What is the tension on rope A?
A) 44 N
B) 69 N
C) 72 N
D) 88 N
E) 98 N
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Multiple Choice
Q 73Q 73
A 10-kg sign is held by two ropes as shown in Figure 6-10. What is the tension on rope B?
A) 69 N
B) 44 N
C) 72 N
D) 88 N
E) 98 N
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Multiple Choice
Q 74Q 74
A 3.00-kg mass and a 5.00-kg mass hang vertically at the ends of a rope that goes over an ideal pulley. If the masses are released, what is the resulting acceleration of the masses?
A) 0 m/s2
B) 3.68 m/s2
C) 2.45 m/s2
D) 4.90 m/s2
E) 6.13 m/s2
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Multiple Choice
Q 75Q 75
A 3.00-kg mass and a 5.00-kg mass hang vertically at the ends of a rope that goes over an ideal pulley. If the masses are released from rest, how long does it take for the 3.00-kg mass to rise by 1.00 m?
A) 0.407 s
B) 0.735 s
C) 0.815 s
D) 1.81 s
E) 0.903 s
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Multiple Choice
Q 76Q 76
A 3.00-kg mass rests on the ground. It is attached to a string which goes vertically to and over an ideal pulley. A second mass is attached to the other end of the string and released. The 3.00-kg mass rises 50.0 cm in 1.00 s. How large was the other mass?
A) 3.67 kg
B) 4.29 kg
C) 6.83 kg
D) 7.15 kg
E) 7.34 kg
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Multiple Choice
Q 77Q 77
FIGURE 6-11
-Refer to Figure 6-11. Block A has a mass of 3.00 kg and rests on a smooth table and is connected to block B, which has a mass of 2.00 kg, after passing over an ideal pulley, as shown. Block B is released from rest. How long does it take block B to travel 80.0 cm?
A) 0.404 s
B) 0.494 s
C) 0.639 s
D) 0.785 s
E) 0.935 s
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Multiple Choice
Q 78Q 78
Refer to Figure 6-11. Block A has a mass of 3.00 kg and rests on a smooth table and is connected to block B, which has a mass of 2.00 kg, after passing over an ideal pulley, as shown. Block B is released from rest. What is the acceleration of the masses?
A) 3.22 m/s2
B) 5.10 m/s2
C) 3.92 m/s2
D) 6.54 m/s2
E) 8.24 m/s2
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Multiple Choice
Q 79Q 79
Refer to Figure 6-11. Block A has a mass of 2.00 kg and rests on a rough table and is connected to block B, which has a mass of 3.00 kg, after passing over an ideal pulley, as shown. Block B is released from rest. The coefficient of kinetic friction between block A and the table is 0.300. What is the acceleration of the masses?
A) 3.92 m/s2
B) 0.981 m/s2
C) 4.71 m/s2
D) 5.89 m/s2
E) 6.54 m/s2
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Multiple Choice
Q 80Q 80
FIGURE 6-12
-Two masses are connected by a string which goes over an ideal pulley as shown in Figure 6-12. Block A has a mass of 3.0 kg and can slide along a smooth plane inclined 30° to the horizontal. What is the mass of block B if the system is in equilibrium?
A) 1.5 kg
B) 3.0 kg
C) 2.6 kg
D) 3.5 kg
E) 6.0 kg
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Multiple Choice
Q 81Q 81
Two masses are connected by a string which goes over an ideal pulley as shown in Figure 6-12. Block A has a mass of 3.00 kg and can slide along a smooth plane inclined 30.0° to the horizontal. Block B has a mass of 2.00 kg. What is the acceleration of mass B?
A) 0.981 m/s2 downward
B) 0.981 m/s2
upward
C) 1.86 m/s2 downward
D) 1.86 m/s2 upward
E) 0 m/s2
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Multiple Choice
Q 82Q 82
Two masses are connected by a string which goes over an ideal pulley as shown in Figure 6-12. Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal. The coefficient of kinetic friction between block A and the plane is 0.400. Block B has a mass of 2.77 kg. What is the acceleration of the blocks?
A) 0.392 m/s2
B) 1.96 m/s2
C) 3.12 m/s2
D) 5.35 m/s2
E) 0 m/s2
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Multiple Choice
Q 83Q 83
Answer: A
Diff: 3 Var: 1 Page Ref: Sec. 6-4
-Two masses are connected by a string which goes over an ideal pulley as shown in Figure 6-12. Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal. The coefficient of static friction between block A and the plane is 0.400. Block B has a mass of 2.77 kg. What is the tension in the string?
A) 22.0 N
B) 22.7 N
C) 26.1 N
D) 24.5 N
E) 27.3 N
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Multiple Choice
Q 84Q 84
FIGURE 6-13
-Refer to Figure 6-13. Block A has a mass of 3.00 kg, block B has a mass of 5.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A) 0.981 m/s2
B) 1.86 m/s2
C) 2.94 m/s2
D) 4.20 m/s2
E) 4.71 m/s2
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Multiple Choice
Q 85Q 85
FIGURE 6-13
-Refer to Figure 6-13. Block A has a mass of 6.00 kg, block B has a mass of 4.00 kg and block C has a mass of 3.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A) 0.981 m/s2
B) 1.97 m/s2
C) 2.74 m/s2
D) 2.26 m/s2
E) 0 m/s2
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Multiple Choice
Q 86Q 86
FIGURE 6-13
-Refer to Figure 6-13 Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks B and C?
A) 13.7 N
B) 20.6 N
C) 25.5 N
D) 34.3 N
E) 38.3 N
Free
Multiple Choice
Q 87Q 87
FIGURE 6-13
-Refer to Figure 6-13. Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks A and B?
A) 13.7 N
B) 20.6 N
C) 34.3 N
D) 25.5 N
E) 38.3 N
Free
Multiple Choice
Q 88Q 88
A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the acceleration of the ball?
A) 0 m/s2
B) 10 m/s2
C) 20 m/s2
D) 50 m/s2
E) 0 m/s2
Free
Multiple Choice
Q 89Q 89
A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the magnitude of the net force on the ball?
A) 0 N
B) 20 N
C) 40 N
D) 50 N
E) 100 N
Free
Multiple Choice
Q 90Q 90
FIGURE 6-14
-A 20.0-gram mass is attached to a 120 cm-long string as shown in Figure 6-14. The tension in the string is measured to be 0.200 N. What is the angle α?
A) 11.2°
B) 13.6°
C) 18.7°
D) 22.4°
E) 24.6°
Free
Multiple Choice
Q 91Q 91
An airplane is flying with constant speed of 300 m/s along a horizontal circle with a radius of 15,000 m. If the lift force of the air on the wings is perpendicular to the wings, at what angle relative to the horizontal should the wings be banked?
A) 15.1°
B) 22.2°
C) 31.5°
D) 37.7°
E) 63.0°
Free
Multiple Choice
Q 92Q 92
A 1000-kg car is picking up speed as it goes around a horizontal curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.350. At what speed will the car begin to skid sideways?
A) 9.25 m/s
B) 23.6 m/s
C) 34.3 m/s
D) 35.0 m/s
E) 18.5 m/s
Free
Multiple Choice
Q 93Q 93
A car moving at 10.0 m/s encounters a bump that has a circular cross-section with a radius of 30.0 m. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump?
A) 200 N
B) 389 N
C) 789 N
D) 489 N
E) 589 N
Free
Multiple Choice
Q 94Q 94
A car moving at 10.0 m/s encounters a depression in the road that has a circular cross-section with a radius of 30.0 m. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A) 200 N
B) 389 N
C) 789 N
D) 489 N
E) 589 N
Free
Multiple Choice
Q 95Q 95
Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle with a radius of 600 m. At the bottom of the dive, the speed of the airplane is 150 m/s. What is the apparent weight of the 70.0-kg pilot at that point?
A) 3310 N
B) 686 N
C) 2630 N
D) 489 N
E) 1370 N
Free
Multiple Choice
Q 96Q 96
Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 320 m/s. What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 7.00 times his true weight?
A) 1740 m
B) 1490 m
C) 2240 m
D) 228 m
E) 41.7 m
Free
Multiple Choice
Q 97Q 97
In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.50 km?
A) 157 m/s
B) 314 m/s
C) 78.5 m/s
D) 255 m/s
E) 510 m/s
Free
Multiple Choice
Q 98Q 98
A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?
A) 29.1°
B) 13.5°
C) 33.8°
D) 56.2°
E) 60.9°
Free
Multiple Choice
Q 99Q 99
FIGURE 6-15
-A 20.0-gram mass is attached to a 120 cm-long string as shown in Figure 6-15. It moves in a horizontal circle with a constant speed of 1.50 m/s. What is the angle α?
A) 10.8°
B) 13.5°
C) 17.7°
D) 24.6°
E) 49.2°
Free
Multiple Choice
Q 100Q 100
FIGURE 6-15
-A 20.0-gram mass is attached to a 120 cm-long string as shown in Figure 6-15. The angle α is measured to be 18.0°. What is the speed of the mass?
A) 0.545 m/s
B) 1.95 m/s
C) 3.82 m/s
D) 1.18 m/s
E) 1.09 m/s
Free
Multiple Choice
Q 101Q 101
In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the floor is lowered away from the passengers, but they remain stuck against the wall of the cylinder. For a cylinder with a 2.0-m radius, what is the minimum speed that the passengers can have for this to happen if the coefficient of static friction between the passengers and the wall is 0.25?
A) 8.9 m/s
B) 2.3 m/s
C) 3.0 m/s
D) 4.9 m/s
E) It depends on the mass of the passengers.
Free
Multiple Choice
Q 102Q 102
A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force required to keep the car from sliding?
A) 9000 N
B) 9810 N
C) 300 N
D) 900 N
E) 3000 N
Free
Multiple Choice
Q 103Q 103
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 20° with a speed of 24.5 m/s. What is the minimum coefficient of static friction required for the car not to skid?
A) 0.12
B) 0.24
C) 0.36
D) 0.48
E) 0.60
Free
Multiple Choice
Q 104Q 104
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.300. What is the force exerted by friction on the car?
A) 1590 N
B) 3430 N
C) 7240 N
D) 7820 N
E) 795 N
Free
Multiple Choice
Q 105Q 105
A 600-kg car is going over a curve with a radius of 120 m that is banked at an angle of 25° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.30. What is the normal force exerted by the road on the car?
A) 1590 N
B) 3430 N
C) 3620 N
D) 7240 N
E) 5330 N
Free
Multiple Choice