A 45- crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 30 , the crate begins to slide downward. Q1:What is the coefficient of static friction between the crate and the ramp? I got that answer and it was .58 It's the second I need help...

A 10 kg crate is sliding at a constant speed of 7 m/s along a frictionless horizontal table, when it encounters a friction patch (s=0.8, k=0.2). Find the work done by friction force acting on the crate, after it has slid 5 m... I got 98 J, but this is wrong, not sure why, when I calculated...

A passenger is pulling on the strap of a 15 suitcase such that the suitcase moves to the right ans speeds up. The tension in the strap is 70. and the strap is inclined 35 degrees above the horizontal. If the acceleration is 1.3 m/s^2, find the frictional force acting on the suitcase. EH?...

:confused: :confused: A force of 30.0 N is required to start a 4.4 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 30.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of...

To meet a U.S. Postal Service requirement, footwear must have a coefficient of static friction of 0.5 or more on a specified surface. In an emergency, what is the minimum time interval in which a person starting from rest can move a distance L on a tile surface if she is wearing footwear meeting...