Physics question help?
Time：2012-11-12 19:27:36 +0000 - 1 year!!> ago
A 95 kg rowboat is initially at rest, until it is pulled toward the dock with a rope with a tension of 30.0 N. The dock is higher than the boat, and the rope makes an angle of 25° at the place where it meets the boat. What is the acceleration of the boat?
30N/95kg = .315
.315 * 25cos=0.286 or 0.29
Did I do this one right?
A man pushes a 20.0 kg cart at constant speed up a hill with an 8.0° slope. What is the net force on the cart?
A bicyclist is pedaling along a road that is sloped upward with angle . At which of these road elevation angles must the bicycle wheels exert the greatest force back on the road to move the bicycle forward at the same constant speed?
(the higher it is in degrees the more force need back?)
Did I do this one right? Also how do I know when to use cos or sin?