A batter hit a 0.145kg baseball straight upward with an initial speed of 25.0m/s. Use the work-energy theorem to calculate the speed of the ball at a height of 20.0m/s above the bat. Ignore air resistance.

The figure below shows a plot of potential energy U versus position x of a 0.76 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) In the graphs, the potential energies are UA = 20.0 J, UB = 35.0 J, and Uc = 45.0 J. Uc UB UA 4 х (m) The particle is released at x = 4.5 m with an initial speed of 6.0 m/s, headed in the negative x direction. (a) If the particle can reach x = 1.0 m, what is its speed there, and if it cannot, what is its turning point? m (b) What are the magnitude and direction of the force on the particle as it begins to move to the left of x = 4.0 m? magnitude direction +X Suppose, instead, the particle is headed in the positive x direction when it is released at x = 4.5 m at speed 6.0 m/s. (c) If the particle can reach x = 7.0 m, what is its speed there, and if it cannot, what is its turning point? m (d) What are the magnitude and direction of the force on the particle as it begins to move to the right of x = 5.0 m? magnitude…

A skier, starting from rest, coasts down a mountain that makes an angle of 20.0 ° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.167. She coasts for a distance of 13.5 m before coming to the edge of a cliff. Use the Work-Energy theorem to find her speed at the edge of the cliff.

A 17 g bullet is accelerated in a rifle barrel81.5 cm long to a speed of 846 m/s.Use the work-energy theorem to find theaverage force exerted on the bullet while it isbeing accelerated.Answer in units of N.

A 1.80 kg snowball is fired from a cliff 12.0 m high. The snowball's initial velocity is 16.4 m/s, directed 27.0° above the horizontal. (a) How much work is done on the snowball by the gravitational force during its flight to the flat ground below the cliff? (b) What is the change in the gravitational potential energy of the snowball-Earth system during the flight? (c) If that gravitational potential energy is taken to be zero at the height of the cliff, what is its value when the snowball reaches the ground? (a) Number (b) Number (c) Number Units Units Units

A 50.2-g golf ball is driven from the tee with an initial speed of 58.0 m/s and rises to a height of 22.4 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.23 m below its highest point? (a) Number (b) Number Units Units

At location A, a 48.0-kg sledder has a height of 36.0 m above the bottom of the hill and possesses 480 J of kinetic energy. While coasting to location B at a height of 12.0 m, 1160 J of mechanical energy are dissipated. Determine the missing potential energy (PE) and kinetic energy (KE) values for locations A and B. Use g m 10.0 N/kg. Tap on an energy box to enter or edit its value. PEA = KEA = PEB = KEB = B For best results, avoid early rounding. Enter answers to at least 3 significant digits. Color-Coding Key: Not checked Correct Incorrect Entering answer Check Answers Send a chat

A motorcyclist drives up a 3.1-meter tall ramp and leaves the ramp with a speed of 42.5 m/s.  If his speed is 37.8 m/s when he reaches the peak of his path, what is the maximum height (in m) above ground that he reaches? (Use energy, not kinematic equations.)

A 0.475-kg ball is thrown straight downward with a speed of 2.21 m/s from a platform 11.2 m above the ground. Air resistance does -6.81 J of work on the ball during its decent. What is the speed of the ball (in m/s) just before it hits the ground?

An advertisement claims that a(n) 1600 kg car can accelerate from rest to 26 m/s in 8.4 s. Given: Unit conversion: 746 W/hp. What average power must the motor pro- duce to cause this acceleration, if we ignore friction and air resistance? Answer in units of hp. Answer in units of hp. Your response... PALETTE