A small 100 g cube is placed on a frictionless plane. The cube has an excess cha

Question

A small 100 g cube is placed on a frictionless plane. The cube has an excess charge of 35 uC. The plane is inclined by an angle of 27 degrees above the horizontal. There is a uniform, horizontal electric field in the region with a strength of 2.50*10^4 N/C.

A. Find the change in electrical potential energy as the box moves 0.75 m up along the plane.
B. Find the change in gravitational potential energy as the box moves 0.75 m up along the plane.
C. What is the change in kinetic energy of the cube as it moves over this 0.75 m?
D. If the plane is not truly frictionless and the box is actually moving at 2.5 m/s after traveling 0.75 n along the plane, how much work was done by friction? (initial velocity=2.0 m/s)

Answers:
A. -0.585 J
B. 0.333 J
C. 0.251 J
D. -0.139 J

Not sure how to solve the problem to get these answers.

Explanation / Answer

http://www.physicsclassroom.com/reviews/energy/energyans3.cfm

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