A box weighing 30 N is on a horizontal floor. The coefficient of static friction is 0.30 and that of kinetic friction is 0.25. Find the frictional force under the following conditions: a) no additional forced is added, b) a force of 5 N is applied to the east, c) a force of 9 N is applied to the west, d) a force of 10 N is applied to the south.

Consider an ideal gas at 27.0 degrees celsius and 1.00 atmosphere pressure. imagine the molecules to be uniformly spaced, with each molecule at the center of a small cube. what is the length l of an edge of each small cube if adjacent cubes touch but don't overlap?

How much energy will be transferred to your eardrum while listening to this sound for 1.0 min?

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.