A 1.00×104-kg train car moving due east at 28.0 m/s collides with and couples to a 2.00×104-kg train car that is initially at rest. What is the common velocity ?f of the two‑car train after the collision? ?f = 9.3m/s What is the total kinetic energy ?i of the two train cars before the collision? ?i = ?J What is the total kinetic energy ?f of the two train cars after the collision?

The ballistic pendulum is a device to measure the speed of a bullet using conservation of energy and momentum. A 20 g bullet is fired horizontally into a 1.1 kg wood block hanging from a 1.2-m-long string. The bullet embeds itself into the block, and the block then swings out to an angle of 35°. A. How high does the block of wood go relative to its initial height when its hanging straight down? B. What is the increase in gravitational potential energy of the wood block at its maximum height? C. Use conservation of energy to determine the speed of the block just after the bullet strikes it. D. Use conservation of momentum to determine the speed of the bullet right before it strikes the block.

A railroad car of mass 3.50 ✕ 104 kg moving at 3.05 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. a) What is the speed of the three coupled cars after the collision?  b) How much kinetic energy is lost in the collision?

microblology textb. PHY166_onlıne Jab. Pinterest Word sdev E Reading li Constants An atomic nucleus at rest decays radioactively into an alpha particle and a different nucleus. Part A What will be the speed of this recoiling nucleus if the speed of the alpha particle is 2.2x105 m/s ? Assume the recoiling nucleus has a mass 57 times greater than that of the alpha particle. Express your answer to two significant figures and include the appropriate units. HÁ Vnucleus = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Provide Feedback Next > P Pearson Copyright © 2021 Pearson Education Inc. All rights reserved. I Terms of Use | Privacy Policy | Permisstons | Contact Us | V0 3:44 acer