Gravitational potential energy of the chile earth system
A 400 N child is in a swing that is attached to a pair of ropes 2.0 m long. Find the gravitational potential energy of the chile earth system relative to the childs lowest position when the ropes are horizontal.
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A 120-g mug at 21degreeesC is filled with 210 g of coffee at 91degreesC. Assumin all of the heat lost by the coffee is transferred to the mug, what is the final temperature of the coffee? The specific heat capacity of the mug is 7.8 102 J/(kgC).
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When the tire surface is rotating at a maximum speed of 1 m/s, the stone flies out of the tread. The magnitude FN of the normal force that each side of the tread channel exerts on the stone is 1.8 N. Assume that only static friction supplies the
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While rolling balls down an inclined plane, Galileo observes that the ball rolls 1 cubit as he counts to 10. How far will the ball have rolled from its starting point when he has counted to 20?
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