A rocket motor is undergoing a "bench test." It is attached to a fixed support by four large springs of constant 10^6 N/m. The motor burns fuel at a rate of 50 kg/s. When the motor is running the springs are observed to stretch 1.5 cm. Determine the exhaust speed of the burned fue

A pumped-storage reservoir sits 144 m above its generating station and holds 7.0×109 kg of water. The power plant generates 341 MW of electric power while draining the reservoir over an 6.1 h period. What fraction of the initial potential energy is lost to nonconservative forces (i.e., does not emerge as electricity)?

Problem 10.12 2 The maximum energy a bone can absorb without breaking is surprisingly small. Experimental data show that a leg bone of a healthy, 60 kg human can absorb about 240 J. W S X H mmand / # 3 E E D C 4 888 R F - 1 % 5 V 7 T G ▾ Part A 1 6 B From what maximum height could a 60 kg person jump and land rigidly upright on both feet without breaking their legs? Assume that all energy is absorbed by the leg bones in a rigid landing. Express your answer with the appropriate units. h= 40 Submit Previous Answers Request Answer < Return to Assignment Provide Feedback MacBook Air X Incorrect; Try Again; One attempt remaining Y H & 7 39 m U N 8 DI M ( 9 K ? MOSISO B O < дв O L P I command - { + [ = ? Review option delete

A tennis ball bouncing on a hard surface compresses and then rebounds. The details of the rebound are specified in tennis regulations. Tennis balls, to be acceptable for tournament play, must have a mass of 57.5 g. When dropped from a height of 2.5 m onto a concrete surface, a ball must rebound to a height of 1.4 m. During impact, the ball compresses by approximately 6 mm. If the ball accelerates uniformly when it hits the floor, what is its approximate acceleration as it comes to rest before rebounding?A. 1000 m/s2         B. 2000 m/s2C. 3000 m/s2         D. 4000 m/s2

A bullet having mass of 0.002kg hits a stationary block of wood having a mass of 14kg. The coefficient of kinetic friction between the block and floor is 0.12, and the block slides 3mm on the floor as a result of impact. Compute the energy lost during the impact. Provide FBD. Thank yooou.

After coming down a slope, a 60-kg skier is coasting northward on a level, snowy surface at a constant 15 m/s. Her 5.0-kg cat, initially running southward at 3.8 m/s, leaps into her arms, and she catches it. (a) Determine the amount of kinetic energy converted to internal energy in the Earth reference frame. (b) What is the velocity, measured in the Earth reference frame, of an inertial reference frame in which the cat's kinetic energy does not change?..

Water flows over a section of Niagara Falls at a rate of 1.30 × 106 kg/s and falls 52.0 m. What is the power dissipated by the waterfall?

You're rolling solid rubber balls on the kitchen floor. Ball 1 has a density of 1.16 × 103 kg/m3 and a radius of 28.0 mm. Ball 2 has an unknown density and a radius of 43.0 mm and is initially at rest. You roll ball 1 at an initial speed of 3.00 m/s, and the two balls collide head-on. Ball 1 reverses direction and comes back to you at 2.00 m/s, and after the collision, the speed of ball 2 is 1.00 m/s. The positive x axis is in the direction of ball 1's initial motion. A.What is the magnitude of the initial momentum of ball 1? Express your answer with the appropriate units.   B. What is the magnitude of the final momentum of ball 1? Express your answer with the appropriate units.   C. What is the magnitude of the initial momentum of ball 2? Express your answer with the appropriate units.

An astronaut lands on a newly-discovered planet (without an atmosphere). As an experiment, she throws vertically upwards a pure vanadium sphere of radius 2.0 cm and density 5.5 × 103 kg m3 with an initial speed of 3.0 ms 1. The point of release is 1.2 m above the ground. She observes the sphere to travel 4.8 m before it starts falling to the ground. Calculate the kinetic energy of the projectile just as it hits the ground.

This time, the pendulum is 1.07 m long and has a mass of 3.19 kg. You give it a push away from vertical so that it starts swinging with a speed of 1.02 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulum s initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down?     18.1 degrees     20.5 degrees     19.3 degrees     11.4 degrees