A thin rod is suspended from a string tied around its middle, as shown from above in the following picture. B A Which of the following forces would, if exerted on its own, cause the rod to rotate counterclockwise? (All directions are with respect to the picture). Select all that apply Pushing down on side A Pushing down on side B Pushing up on side A Pushing up on side B
A thin rod is suspended from a string tied around its middle, as shown from above in the following picture. B A Which of the following forces would, if exerted on its own, cause the rod to rotate counterclockwise? (All directions are with respect to the picture). Select all that apply Pushing down on side A Pushing down on side B Pushing up on side A Pushing up on side B
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A thin rod is suspended from a string tied around its middle, as shown from above in the following
picture.
A
B
Which of the following forces would, if exerted on its own, cause the rod to rotate
counterclockwise? (All directions are with respect to the picture). Select all that apply
Pushing down on side A
Pushing down on side B
Pushing up on side A
Pushing up on side B
8
A tennis ball and a bowling ball are swung in circles at the same constant speeds. What can we say
about the work the string does on both objects?
The work done on both objects is zero because the force the string exerts on each of them is
perpendicular to their displacement.
The work done on the bowling ball is greater than the work done on the tennis ball because
the bowling ball has a greater mass.
The work done on both objects is zero because the force that the string exerts on each of
them passes through their axis of rotation.
The work done on the bowling ball is greater than the work done on the tennis ball because
the force the string exerts on the bowling ball is greater.
A cart moves along a frictionless track and collides with another stationary cart. The two carts
stick together after the collision. Which of the following statements are true about the [cart 1.
cart 2) system for this process?
The total momentum of the system increases after the collision.
The total kinetic energy of the system increases after the collision.
The total momentum of the system decreases after the collision.
The total kinetic energy of the system remains constant.
The total kinetic energy of the system decreases after the collision.
The total momentum of the system remains constant.
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