hockey puck

During a hockey game, a puck is given an initial speed of 12.00 m/s. It slides 54.00 m on the ice before it stops. What is the coefficient of kinetic friction between the puck and the ice?

Problem relating to centroid

The asking problem: For the semiannular area, determine the ratio of r1 to r2 for which the centroid of the area is located at x=-1/2*r2 and y=0. Note: This problem is a 2D problem and not a 3D. It was taken from the «Distributed forces: Centroids and Centers of Gravity» section of my static course. The files is in word97 ...continues

About a problem relating to rigid body in equilibrium

The asking problem: The uniform rod AB lies in a vertical plane. Its ends are connected to rollers which rest against frictionless surfaces. Determine the relation between the angles teta and alpha when the rod is in equilibrium. Note: This is a 2D problem and not a 3D. It was taken from the «Statics of Rigid Bodies in Two Di ...continues

Projectile problem

On a distant planet, golf is just as popular as it is on earth. A golfer tees off and drives the ball 3.5 times as far as he would have on earth, given the same initial velocities and launch angles on both planets. The ball is launched at a velocity of 45m/sec at an angle of 29 degrees above the horizontal. On the distant planet ...continues

Working with projectile motion.

William Tell must split the apple atop his son's head from a distance of 27 meters. When he aims directly at the apple, the arrow is horizontal. At what angle must he aim the arrow to hit the apple if the arrow travels at a speed of 35m/sec?

Projectile problem

A hunter aim directly at a target (on the same level) 120 meters away. If the bullet leaves the gun at a speed of 250m/sec, by how much will it miss the target? At what angle should the gun be aimed so the target will be hit?

Calculating the total time and the average force during the movement of a mass on a surface.

On a frictionless ice a variable force P in Newtons, expressed by P= 5 + 6 t, is applied to an initially stationary block of wood to move it across the ice until its final speed is V= 25 m/sec. The mass of the wood is M= 3 kg. Vectors P and V are in the same direction. a. Find the time, in seconds, that the force is applied. b ...continues

Calculating the loss of mechanical energy.

A block of mass M slides along a horizontal table with speed Vo. At x=0 it hits a spring constant k and begins to experience a frictional force. The coefficient of friction is a variable and is given by u=bx, where b is a constant. Find the loss in mechanical energy when the block has come momentarily to rest.

Mass moving in circular motion

Mass m whirls on a frictionless table, held to circular motion by a string which passes through a hole in that table. The string is slowly pulled through the hole so that the radius of the circle changes from L1 to L2. Show that the work done in pulling the string equals the increase in kinectic energy.

Calculating a leaping man's power.

A 160 lb man leaps into the air from a crouching position. His center of gravity rises 1.5 ft before he leaves the ground, and it then rises 3 ft to the top of his leap. What power does he develop assuming that he pushes the ground with constant force?