You push a box of mass 24.9 kg with your car up to an icy hill slope of irregular shape to a height 4.4 m. the box has a speed 14 m/s when it starts up the hill, the same time that you brake. it then rises up to the top (with no friction) before immediately falling off a sheer cliff to the ground (with no drag).
(a) what is the speed of the box at the top of the hill?
(b) what is the direction (unit vector) of the box's velocity just before hitting the ground?

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Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be