A towing machine can deliver horizontal towing force T by a strong, inelastic cable. The towing force T can vary as shown in the graph. A 490 kg timber, initially at rest, is attached to the towing machine. The static friction coefficient between the timber and the surface is Hk=0.49, and the towing machine must overcome the minimum force needed to move the timber against the static friction. If the kinetic friction coefficient between the timber and the surface is u = 0.39, determine the velocity of the timber at t 6.5 seconds. %3D M T (N) 2000 T=125 r(s) 4.

A flatbed truck traveling at 125 kph circles a horizontal curve with a radius of 317 m that is inwardly banked at 10°. The static friction coefficient between the truck bed and the 222-kg crate it transports is 0.66. Calculate the friction force (N) acting on the crate. 10°

A horizontal force is exerted on a 150 lb chair at rest. The coefficient of static friction between the chair and the floor is 0.55. Determine the maximum horizontal force that can be applied to the chair before it moves.