Physics I. Unit : potential energy and conservation of energy. A,B,C,D,E, and F

Question

Physics I. Unit : potential energy and conservation of energy. A,B,C,D,E, and F please

The figure shows a ball with mass m = 0.488 kg attached to the end of a thin rod with length L = 0.387 m and negligible mass. The other end of the rod is pivoted so I ball can move in a vertical circle. The rod is held horizontally as shown and then given enough of a downward push to cause the ball to swing down and around and just the vertically upward position, with zero speed there. How much work is done on the ball by the gravitational force from the initial point to (a) the lowest point, (b) the highest point, and (c) the point on the right level with the initial point? If the gravitational potential energy of the ball-Earth system is taken to be zero at the initial what is it when the ball reaches (d) the lowest point, (e) the highest point, and (f) the point on the right level with the initial point? (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units (f) Number Units

Explanation / Answer

(a) work done by gravity = - m g deltaH

= - m g (-L) = m g L

= 0.488 x 9.8 x 0.387

= 1.85 J

(B) W = - m g (L) = -m g L

= - 1.85 J

(C) deltaH = 0

W = 0

(D) PE = m g deltah

PE = m g (-L) = - 1.85 J

(E) PE = m g L = 1.85 J

(F) deltaH = 0

PE = 0

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---