Fundamentals of Physics Study Set 2

Physics & Astronomy

Quiz 12 :

Equilibrium and Elasticity

Quiz 12 :

Equilibrium and Elasticity

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A 160-N child sits on a light swing and is pulled back and held with a horizontal force of 100 N.The magnitude of the tension force of each of the two supporting ropes is:
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B

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For a body to be equilibrium under the combined action of several forces:
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C

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A massless meter stick on a horizontal frictionless table top is pivoted at the 80-cm mark.A img force is applied perpendicularly to the end of the stick at 0 cm, as shown.A second force img (not shown)is applied perpendicularly to the stick at the 100-cm end of the stick.The forces are in the plane of the table top.If the stick does not move, the force exerted by the pivot on the stick: img
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E

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The center of gravity coincides with the center of mass:
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A 5.1-kg mass is located at the origin, and a 2.3-kg mass is located at x = 4.9 cm.Assuming g is constant, what is the location of the center of mass xcom, and the location of the center of gravity xcog, of the two masses?
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Which of the following is NOT in equilibrium?
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Which of the following is in static equilibrium?
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Three identical uniform rods are each acted on by two or more forces, all perpendicular to the rods.Which of the rods could be in static equilibrium if an additional force is applied at the center of mass of the rod? img
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The location of which of the following points within an object might depend on the orientation of the object?
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A net torque applied to a rigid object always tends to produce:
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A massless meter stick on a horizontal frictionless table top is pivoted at the 80-cm mark.A force is applied perpendicularly to the end of the stick at 0 cm, as shown.A second force (not shown)is applied perpendicularly at the 60-cm mark.The forces are in the plane of the table top.If the stick does not move, the force exerted by the pivot on the stick: img
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For a body to be equilibrium under the combined action of several forces:
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To determine if a rigid body is in equilibrium the vector sum of the gravitational forces acting on the particles of the body can be replaced by a single force acting at:
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For an object in equilibrium the sum of the torques acting on it vanishes only if each torque is calculated about:
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A picture can be hung on a wall in three different ways, as shown.The tension in the string is: img
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A picture P of weight W is hung by two strings as shown.The magnitude of the tension force of each string is T.The total upward pull of the strings on the picture is: img
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A cube balanced with one edge in contact with a table top and with its center of gravity directly above the edge is in ________ equilibrium with respect to rotation about the edge and in ________ equilibrium with respect to rotation about a horizontal axis that is perpendicular to the edge.
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The conditions that the sum of forces and the sum of the torques both vanish:
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A cylinder placed so it can roll on a horizontal table top, with its center of gravity below its geometrical center, is:
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A cylinder placed so it can roll on a horizontal table top, with its center of gravity above its geometrical center, is:
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