A 40 lb block starts from rest and slide down a plane at an angle of 30o with the horizontal

In 50 seconds, a 3.2-ton vehicle can reach 140 mph from rest. Exclude friction losses while calculating the engine's output.

A 16-lb shell has a velocity of 2000 ft/s when it leaves the barrel of a cannon. if the barrel is 10 ft, find the average force on the shell while its in the barrel.

A 25-kg block is initially at rest on a horizontal surface, and a horizontal force of 75.0 N is required to set the block in motion after which a horizontal force of 60.0 N is required to keep the block moving with constant speed.   Find   (a) the coefficient of static friction and (b) the coefficient of kinetic friction between the block and the surface.

In the system in which the first starts to move without speed, the masses of 10, 1 kg each, with the effect of the 18 N force T, with a radius of R=578 mm in t secondsIt reaches an angular velocity of 141 rpm. Since the radius of the pulley is r= 165 mm, ignore the friction and all the masses except the four masses.Find t by

A 12-lb weight stretches a spring 2 ft. The weight is released from a point that is 1 ft below the equilibrium position with an upward velocity of 4 ft s-1.

Shown below are coplanar forces F1 and F2 pulling on a 1.0 - kg block which ismoving at constant speed on a horizontal surface. If the coefficient of kineticfriction between surfaces is 0.2, what is the magnitude of F2?

The lower block of mass m2 = 3.2 kg is pulled on by a rope with a tension force of 28 N. The upper block has mass m1 = 1.8 kg. The coefficient of kinetic friction between the lower block and the surface is 0.32. The coefficient of kinetic friction between the lower block and the upper block is also 0.32. What is the acceleration of the 3.2 kg block?

Block A weighs 500 N and block B weighs 280 N. Block A is held by a cord fastened to the wall. Force P is applied on B to drag it to the left at constant speed. The coefficient of friction between A and B is 0.30 and that between B and the floor is 0.32. Find the following (a) the normal force exerted by B on A, FNA  (b) the tension in the cord attached to A, T  (c) the frictional force exerted by B on A, fA  (d) the force applied on B, P  (e) the frictional force exerted by the ground on B, fB.

Crate A is gently placed with zero initial velocity onto a moving conveyor belt. The coefficient of kinetic friction between the crate and the belt is μk . Draw the FBD and KD for A immediately after it contacts the belt.