1. A box is sitting on a wooden ramp. The box has a mass of 25.0 kg. The coefficient of static friction is 0.375 and the coefficient of kinetic friction is 0.125 The ramp is at an
angle of 55.0°.

a. How much force is needed to start moving the box up the ramp?

b. How much force is needed to keep the box moving up at a constant velocity?

c. How much force is needed to accelerate the box up the ramp at 1.50 m/s??

d. If the pushing force is gone, what is the acceleration of the box DOWN the
ramp?

Please help

Your physics assignment is to figure out a way to use electricity to launch a small 6.0-cm-long plastic drink stirrer. you decide that you'll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire, as shown in figure p23.56 . when you let go, the electric force of the wire on the plastic rod will shoot it away. suppose you can uniformly charge the plastic stirrer to 10 nc and that the linear charge density of the long wire is 1.0 x10-7 c/m. what is the net electric force on the plastic stirrer if the end closest to the wire is 2.0 cm away?