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Physics & Astronomy

Quiz 2 :

Kinematics: Description of Motion

Quiz 2 :

Kinematics: Description of Motion

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A hospital patient is given 500 cc of saline by IV. If the saline is received at a rate of 4.0 mL/min, how long will it take for the half liter to run out
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Write the expression for the total volume of the saline.
img The time it takes for the saline to be finished is equal to the total volume of the saline divided by the rate of its injection,
img Here
img is the rate of injection of the saline.
Substitute
img for
img and
img for
img ,
img img Therefore, it takes about two hours for the half liter saline to run out.

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A scalar quantity has (a) only magnitude, (b) only direction, (c) both magnitude and dirrection.
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A physical quantity which have only magnitude is called as scalar quantity and have both magnitude and direction is known as vector quantity. Here, magnitude is defined as the size or quantity, whereas the direction is referred as a vector, which is directed from one place to another.
A vector has both magnitude and direction, the then option (c) is incorrect.
A scalar quantity has only magnitude but no specified direction. Hence, the option (b) is also incorrect.
Therefore, the correct answer is
img .

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If the displacement of an object is 300 m north, what can you say about the distance traveled by the object
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Distance traveled by an object is the change in its position whereas displacement is shortest path traced by the object.
Measuring the shortest path is the displacement, so its magnitude will always be equal to or smaller than the distance.
If the displacement of the object is 300 m north, then the distance of the object may be greater or equal to the displacement.
Suppose, if the object traces a straight line path towards north, then the distance will also be 300 m. But, if the same object moves in different paths and finally reaches north, then the distance of the object will be greater than the displacement.

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A senior citizen walks 0.30 km in 10 min, going around a shopping mall. (a) What is her average speed in meters per second (b) If she wants to increase her average speed by 20% when walking a second lap, what would her travel time in minutes have to be
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A motorist travels 80 km at 100 km/h, and 50 km at 75 km/h. What is the average speed for the trip
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What is the magnitude of the displacement of a car that travels half a lap along a circle that has a radius of 150 m How about when the car travels a full lap
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Distance is to displacement as (a) centimeters is to meters, (b) a vector is to a scalar, (c) speed is to velocity, (d) distance is to time.
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A vector quantity has (a) only magnitude, (b) only direction, (c) both direction and magnitude.
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Does a fast-moving object always have higher acceleration than a slower object Give a few examples, and explain.
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A car is traveling at a constant speed of 60 mi/h on a circular track. Is the car accelerating Explain.
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The average velocity of a jogger on a straight track is computed to be +5 km/h. Is it possible for the jogger's instantaneous velocity to be negative at any time during the jog Explain.
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Can the displacement of a person's trip be zero, yet the distance involved in the trip be nonzero How about the reverse situation Explain.
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Speed is the magnitude of velocity. Is average speed the magnitude of average velocity Explain.
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What can be said about average speed relative to the magnitude of the average velocity (a) greater than, (b)equal to, (c) both a and b.
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A hospital nurse walks 25 m to a patient's room at the end of the hall in 0.50 min. She talks with the patient for 4.0 min, and then walks back to the nursing station at the same rate she came. What was the nurse's average speed
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Which of the following is always true about the magnitude of the displacement: (a) It is greater than the distance traveled; (b) it is equal to the distance traveled; (c) it is less than the distance traveled; or (d) it is less than or equal to the distance traveled
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You are told that a person has walked 750 m. What can you safely say about the person's final position relative to the starting point
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A train makes a round trip on a straight, level track. Tire first half of the trip is 300 km and is traveled at a speed of 75 km/h. After a 0.50 h layover, the train returns the 300 km at a speed of 85 km/h. What is the train's average speed and (b) average velocity
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On a position-versus-time plot for an object that has a constant acceleration, the graph is (a) a horizontal line, (b) a nonhorizontal and nonvertical straight line, (c) a vertical line, (d) a curve.
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An Olympic sprinter can run 100 yd in 9.0 s. At the same rate, how long would it take tire sprinter to run 100 m
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