A positive charge Q is fixed in place on a frictionless ice rink. A positively charged...

A positive charge Q is fixed in place on a frictionless ice rink. A positively charged hockey puck is released on the ice nearby. What will be true about the motion of the hockey puck?

A) Its speed will be greatest immediately after it is released.

B) Its acceleration will be zero immediately after it is released.

C) As its distance from Q increases, its acceleration will increase.

D) As its distance from Q increases, its speed will decrease.

E) As its distance from Q increase, its speed will increase.

Expert Solution

The nature of the charge on the puck and the fixed charge is the same. So, the force between them will be repulsive. As the puck moves away from the fixed charge its velocity will increase because the force of repulsion will be acting on the puck for quite a long time.

A) False, because the velocity of the puck will start increasing when it is released. The velocity will start increasing soon after it is released due to the acceleration generated by the repulsive forces.

B) False, The puck will have some initial acceleration, due to which it will attain a velocity in the beginning.

C) False, the force of repulsion will decreases with distance, so the acceleration will also decrease.

D) False, as the puck moves away from the charge Q, the repulsive forces on Q will decrease but it will still generate a positive acceleration which will increase the velocity of the puck.

E) True, the velocity of the puck will increase as it moves away from Q, the force of repulsion will decrease in magnitude, but would still be generating a positive acceleration which in turn will increase the velocity of the puck.

genius_generous answered 2 years ago

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