A small box with a mass 32.0 g is released from rest at point A, which is at the top edge of a large, hemispherical bowl. Assume that the size of the box is small as compared to the radius of the bowl so that the box can be treated as a particle. The work done by friction on the box when it moves from point A to point B at the bottom of the bowl has magnitude 0.640 J. Between points A and B, how much work is done on the rock by the normal force?1. Between points A and B, how much work is done on the rock by gravity?2. What is the speed of the rock as it reaches point B?3. Of the three forces acting on the rock as it slides down the bowl, which (if any) are constant and which are not? Explain.4. Just as the rock reaches point B, what is the normal force on it due to the bottom of the bowl?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

An charge with mass m and charge q is emitted from the origin, (x,y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.