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    Momentum and Heat

    Homework Statement A 30 kg boy on a 5 kg sled takes a running start from the top of a slippery hill, moving at 4.00 m/s. The hill is 60 m long at an angle of 11.5 degrees above the horizontal. The boy and sled reach the bottom of the hill moving at 10.0 m/s. (a) How much mechanical energy...
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    2-d momentum collision

    Homework Statement Two hockey pucks of equal mass undergo a collision on a hockey rink. One puck is initially at rest, while the other is moving with a speed of 5.4 m/s. After the collision, the velocities of the pucks make angles of 33° and 46° relative to the original velocity of the...
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    Waterfall Energy Question

    Homework Statement The highest waterfall in Canada is the Della Falls in British Columbia, with a change in elevation of 4.4  102 m. When the water has fallen 12% of its way to the bottom, its speed is 33 m/s. Neglecting air resistance and fluid friction, determine the speed of the water...