17 Conservation of Energy

# 17 Conservation of Energy - give an expression for the...

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A non-bouncy object is dropped from the top of a 100m building. If the object comes to rest upon hitting the ground, does this defy conservation of energy? Explain.
A 0.5 kg toy sinks into the lake. If the buoyant and viscous forces of the water on the toy do a total of 10J of work, what is the speed of the toy 3m below the surface?

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You just took a ride on the roller coaster below and wonder how fast you were going at the end of the ride. By counting the steps into and out of the ride, you determine that you started 30m up and ended 5m up. How fast were you going at the end?
A ball moves on a spring at a 30° angle below the horizontal. The equilibrium length of the spring is 1.5m. If the ball is released from rest at a total spring length of 1m,

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Unformatted text preview: give an expression for the kinetic energy when the spring is at its equilibrium length. A ball moves on a spring at a 30° angle below the horizontal. If the ball is released from rest at 1m above the equilibrium, how much will the spring stretch beyond its equilibrium length (in terms of k and m)? A 2kg ball on a 3m pendulum is released from rest at a 45° above the lowest point. If the spring constant is 3600N/m, how far will the spring compress? (Ignore the small rise in the ball at the end.) A cart is to be released from the left side of the roller coaster shown below. If the cart is to make it all the way around the loop (which has a radius of 20m) without falling, what is the minimum height of the starting point?...
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17 Conservation of Energy - give an expression for the...

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