Kinetic friction

Hi. Can you tell me how to do the following problem? I can't find an applicable equation for it, or a similar problem in my book. "A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.190 and the push imparts an initial speed of 4.20 m/s?" Thank y ...continues

Vector, projectile

Hi. More vector confusion. "A catapult on a cliff launches a large round rock towards a ship from a H of 33.0 m above sea level, directed at an angle above the horizontal with an unknown speed v(0). The projectile remains in flight for 6.00 seconds and travels a horizontal distance D of 169 m. Assuming that air friction can b ...continues

Contact force

Hi. Here's my problem: "Two blocks, M1 and M2, are in contact on a frictionless table. A horizontal force F is applied to M2. If M1 = 1.30 kg, M2 = 3.20 kg, and F = 5.30 N, find the size of the contact force between the two blocks." I know that I first need to treat the blocks as one body and find the acceleration, so... ...continues

Force, speed

Hi. Here's a tricky one (for me, anyway): "A train has a mass of 5.07 x 10^6 kg and is moving at 75.5 km/hr. The engineer applies the brakes, which results in a net backward force of 1.71 x 10^6 N on the train. The brakes are held on for 26.0 s. What is the new speed of the train?" Thank you!

Force of friction

A 17.2 kg box is released on a 38.1 degree incline and accelerates down the incline at 0.269 m/s^2. Find the friction force impeding its motion, and the coefficient of friction.

force, cycling up hill

"If a bicyclist of mass 69.0 (including the bicycle) can coast down a 6.90 degree hill at a steady speed of 5.60 km/hr because of air resistance, how much force must be applied to climb the hill at the same speed?"

force, pulley system

"The leg and cast in the figure below (see attached Word file) weigh 217 N (w1). (Assume w3 = 100 N and theta = 39.3°). Determine the weight w2 needed in order that there be no force exerted on the hip joint by the leg plus cast."

force, weight in moving elevator

A 75.6 kg person stands on a scale in an elevator. What does the scale read (it reads mass units, not weight units) when the elevator is accelerating downward at 3.00 m/s^2?"

force, acceleration, coefficient of kinetic friction

"In the figure below, m1 = 10.7 kg and m2 = 4.15 kg. The coefficient of kinetic friction is 0.271. If the system is set in motion with m2 moving downward, what will be the acceleration of the system?" I'm not sure how to factor in the coefficient of kinetic friction. Can you show me how to do this problem? Thank you!

force

"A student's car stalls right in front of a speed bump while she is on her way to physics class. To pull it over the bump, she ties a cable to her bumper and to a nearby tree, and pulls with a force, F, of 70.0 pounds (311 N) at the midpoint in a perpendicular direction. If theta is 12.4 degrees, what is the size of the force pu ...continues