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Question1

Determine the force needed to hold a 1000 pounds car on an inclined plane that makes angle of 30 degree with horizontal, if the force is to be parallel to the inclined?

Question2

In a simplify roller bearing, the inner cylinder has a radius of 1.0 cm and is stationary. The outer hollow cylinder has a radius of 1.2 cm and is rotating at 8.0 rpm. Between the two cylinders are some small cylinders with a radius of 0.10 cm, which roll without slipping on both the inner and outer cylinders. What is an angular speed of the small cylinders, which is between two inner and outer cylinders?

Question3

A proton is initially at rest at a point where the potential is 504 V. Sometime later on the proton is at a point where the potential is 193 V. If no force other than electrostatic force acts on the proton, what is its final kinetic energy?

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