Can you help me solving these problems ? Physics 133 Mechanics-Homework #9 1. Ch
ID: 1498055 • Letter: C
Question
Can you help me solving these problems ?
Physics 133 Mechanics-Homework #9 1. Chapter 9, Problem 5 a. Write the kinetic energy of a particle in terms of momentum and mass only. Show your work! b. How fast wouid a 5.50kg bowing ball have to travel to have the same momentum as a 45,9g golt bal raveling 50.0m/s? 2 Chapter 9, Problem 6 The force-versus-time curve for a club striking a 45.9g goi ball is shown in Figure 9.P2 a What is the impuise on the go bal? b. the ball starts from rest, what is es speed after being acted on by the impuse? 3 Chapter 9. Problem 12 A 0.275kg volleyball is braveling with a velocity of 12.5m's when a player returns it directly along its original path in the opposte direction at a speed of &50ms a. What impuise did the ball reoeive from the player? b. If the ball was in contact with the player's hand for 80.0ms, what average foroe did she apply to the bal? 4 Chapter 9. Problem 17 A 3,00ktarget ile fires & 9.72g bulet with a speed of 762m/s. I the rifle is alowed to recoil freely. what is its reooil velocity? 5 Chapter 9, Problem 22 A225N/m spring compressed 0.10m and held by a string. The spring is placed between two artrack gldorsof masses 200g and 300g. When the string is cut, the spring expands and gives all of its energy to the glders Calculate the velocity of each glider after the spring expands. 6 Chapter 9, Problem 26 A loaded boxcar of 25,000kg mass is rolling freely down a level track at a speed of 0.600m/s. The boxcar colides with a stationary boxcar, couples to it and they move off together at 0.400ms a What is the mass of the second boxcar? b. By what fraction is the kinetic energy reduced by the collision? 7, Chapter 9. Problem 27 Aneutron (mass l 67510.77kg) wth volocity 3.03x10°m/s makes a portoctly castc hoadoncolison with a stationary alpha parcle (mass 6 64 × 10 2, kg). a. What is the ratio of the alpha mass to the neutron mass? b. Find the velocities of both particles ater the collision. c What fraction of the neutron's kinetic energy is transterred to the alpha particle? 8 Chapter 9. Problem 33. Two masses colide head-on. Before the collision, their velocities are v-+2.00m/s and v--3.00m/s. After the collision, their velocities are --1.50m/s and -40.50m/s. Find the mass ratio and the coefficient of restitution for the collision 9. Chapter 9, Problem 35 Consider the colision betwoon a bat and a baseball. Take the balls mass as 0 142kg and the bat's mass as 1.00kp. Let the initial speed of the bal be 40.0m/s and suppose the bat moves with a velocity of-15.0m/s Assume re coeficerE of restation is 0 400 a Calculate the velocity of the bal and bat after the collision b. Are your answers reasonable?
Explanation / Answer
1) a) KE = mv2/2 = (mv)2/2m = p2/2m
b) 5.50v2/2 = 0.459 * 502/2
=> v = 50 * (0.459/5.50)1/2 = 14.4 m/s
(Note: Only one question will be answered in one turn)