Question

Please answer most of the questions if not all.

1. A box is given a horizontal shove so that it slides across a floor with an initial speed of 3.5m/s. If it travels 4.2m before stopping what is the coefficient of kinetic friction U_k?

2. A girl weighing 480N is standing on a scale while riding a ferris wheel that goes around in a circular path that is 20m in diameter at a speed of 4.95m/s. What does the scale read (in newtons) when the girl is at the top of her circular path?

3. A boy on a sled starting from rest slides 88m down a hill inclined at 12.3 degree. The boy and sled together have a mass of 48kg. If the final speed is 13.2m/s how much mechanical energy was dissipated by friction? (i.e. what is W_NC?)

Answer 1