A 375g ball is thrown with an initial horizontal velocity of 21.0m/s at a 4.50kg target that is sliding towards the thrower with an initial velocity of -1.50m/s. The ball hits the target and emerges from the other side with a final velocity of 6.50m/s. a) What is the final velocity of the target? b) What is the change in the kinetic energy of the system?

Two gliders are set in motion on a horizontal air track. A spring of force constant k is attached to the back end of the second glider. As shown in Figure P8.48, the first glider, of mass m1, moves to the right with speed v1, and the second glider, of mass m2, moves more slowly to the right with speed v2. When m1 collides with the spring attached to m2, the spring compresses by a distance xmax, and the gliders then move apart again. In terms of v1, v2, m1, m2, and k, find (a) the speed rat maximum compression, (b) the maximum compression xmax, and (c) the velocity of each glider after m1 has lost contact with the spring.

A particle is suspended from a post on top of a can by a light string of length L. as shown in Figure P9.57a. The can and particle are initially moving to the right at constant speed the with the string vertical. The can suddenly comes to rest when it runs into and sticks to a bumper as shown in Figure P9.57b. The suspended panicle swings through an angle . (a) Show that the original speed of the cart can be computed from. vi=2gL(1cos) (b) If the bumper is still exerting a horizontal force on the cart when the hanging panicle is at its maximum angle forward from the vertical. at what moment does the bumper stop exerting a horizontal force?

A 0.12.kg bullet moving 215.m/s hits a 6.7 kg block of wood at rest. If the bullet becomes embedded in the wood (and if the block of wood is free to move), what is the speed of the system immediately after the impact? What percent of the kinetic energy is lost due to the impact? Speed: 4.604.m/s 4.139_m/s С. D. 4.444.m/s 4.007 m/s 3.783_m/s А. В. Е. 4.285_m/s F. /--/ Percent: 114.60 percent 98.24 percent 111.20 percent 101.70 percent 94.82 percent 106.30 percent А. D. В. Е. С. F.

Find the magnitude of the shopping cart's final velocity. After Emily Jumps, the shopping cart is... A. moving in the same direction as Emily. B. moving opposite the direction emily is moving. C. is not moving. Find the change of kinetic energy of the entire system and whether it increased or decreased.

When a 0.050 kg golf ball takes off after being hit, its speed is 42 m/s. a) What is the change in kinetic energy of the ball? b) Assume that the force on the golf ball acts parallel to the motion of the ball and that the club is in contact with the ball for a distance of 0.01 m. Determine the average force applied to the ball by the club.

A 0.1000-kg marble is fired by a boy from a slingshot at point A, at a height of 1.500 m from the ground. It hits a frictionless inclined concrete wall at point B, which is 30.0 m away from the boy. After hitting the wall, the marble rebounds with a velocity, VB. directed 140° from the horizontal as shown. The ball finally hits point C on the frictionless floor. The velocity of firing, VA, is 20.0 m/s, directed 45.0° with the horizontal. VA = 20 m/s 14.42 m/s 4.80 m/s 15.51 m/s 5.72 m/s [1.5 m C 9.37 m/s 5.72 m/s 10.98 m/s 15.51 m/s 30 m VB 60° B Which of the following gives the closest value of the magnitude of the velocity of the ball BEFORE it strikes the floor at point C? = 140° Which of the following gives the closest value of the magnitude of the velocity of the ball AFTER it strikes the floor at point C, if the coefficient of restitution between the ball and the floor is 0.650?

In target practice, a thick board stops a bullet at a penetration depth of 5.80 cm. Use the conservation of energy method. a) Find the average frictional force that stops the bullet. b) If the same bullet hits another thinner board of 2.90 cm thick and made by the same material (assuming the same average frictional force), what is the speed of the bullet as it emerges from the thinner board?

A 0.550 kg ball of Play-Doh hangs from the ceiling by a string. A 0.100 kg wad of Play-Doh is thrown straight upward from below the ball and strikes the ball with a speed of 6.40 m/s and sticks to it.   Is the mechanical energy of this system conserved? Yes or No   How high (in cm) does the combined mass of Play-Doh rise above the original position of the ball of Play-Doh?

1.A cart of mass m moves with a speed v on a frictionless airtrack and collides with an identical cart that is stationary. If the two carts stick together after the collision, what is the final kinetic energy of the system?Explain and labled the problem.