Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 7, Problem 31CQ
A ball bounces off a wall with a velocity whose magnitude is less than it was before hitting the wall. Is the collision elastic? Explain.
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Chapter 7 Solutions
Physics of Everyday Phenomena
Ch. 7 - Does the length of time that a force acts on an...Ch. 7 - Two forces produce equal impulses, but the second...Ch. 7 - Is it possible for a baseball to have as large a...Ch. 7 - Are impulse and force the same thing? Explain.Ch. 7 - Are impulse and momentum the same thing? Explain.Ch. 7 - If a ball bounces off a wall so that its velocity...Ch. 7 - Is there an advantage to following through when...Ch. 7 - What is the advantage of a padded dashboard...Ch. 7 - What is the advantage of an air bag in reducing...Ch. 7 - If an air bag inflates too rapidly and firmly...
Ch. 7 - If you catch a baseball or softball with your bare...Ch. 7 - Suppose you move your hand forward to meet the egg...Ch. 7 - A truck and a bicycle are moving side by side with...Ch. 7 - Is the principle of conservation of momentum...Ch. 7 - A ball is accelerated down a fixed inclined plane...Ch. 7 - Two objects collide under conditions where...Ch. 7 - Which of Newtons laws of motion are involved in...Ch. 7 - A compact car and a large truck have a head-on...Ch. 7 - A fullback collides midair and head-on with a...Ch. 7 - Two ice skaters, initially at rest, push off one...Ch. 7 - Two shotguns are identical in every respect...Ch. 7 - When a cannon rigidly mounted on a large boat is...Ch. 7 - Is it possible for a rocket to function in empty...Ch. 7 - Suppose you are standing on a surface that is so...Ch. 7 - Suppose an astronaut in outer space suddenly...Ch. 7 - Suppose that on a perfectly still day, a sailboat...Ch. 7 - A skateboarder jumps on a moving skateboard from...Ch. 7 - A railroad car collides and couples with a second...Ch. 7 - Is the collision in question 28 elastic, partially...Ch. 7 - If momentum is conserved in a collision, does this...Ch. 7 - A ball bounces off a wall with a velocity whose...Ch. 7 - A ball bounces off a wall that is rigidly attached...Ch. 7 - A cue ball strikes an 8 ball of equal mass, which...Ch. 7 - Two lumps of clay traveling through the air in...Ch. 7 - Two lumps of clay, of equal mass, are traveling...Ch. 7 - Two cars of equal mass collide at right angles to...Ch. 7 - A car and a small truck traveling at right angles...Ch. 7 - A cue ball strikes a glancing blow against a...Ch. 7 - An average force of 4800 N acts for a time...Ch. 7 - What is the momentum of a 1300-kg car traveling...Ch. 7 - A bowling ball has a mass of 7 kg and a speed of...Ch. 7 - A force of 128 N acts on a ball for 0.45 s. If the...Ch. 7 - A 0.14-kg ball traveling with a speed of 40 m/s is...Ch. 7 - A ball experiences a change in momentum of 64...Ch. 7 - A 75-kg front-seat passenger in a car moving...Ch. 7 - A ball traveling with an initial momentum of 1.7...Ch. 7 - A ball traveling with an initial momentum of 5.1...Ch. 7 - A fullback with a mass of 108 kg and a velocity of...Ch. 7 - An ice skater with a mass of 70 kg pushes off...Ch. 7 - A rifle with a mass of 3.4 kg fires a bullet with...Ch. 7 - A rocket ship at rest in space gives a short blast...Ch. 7 - A railroad car with a mass of 13,000 kg collides...Ch. 7 - A 4150-kg truck traveling with a velocity of 12...Ch. 7 - For the two vehicles in exercise E16: a. Sketch to...Ch. 7 - A car with a mass of 1600 kg traveling with a...Ch. 7 - Refer to example box 7.2 and figures 7.17 and...Ch. 7 - A fast ball thrown with a velocity of 40 m/s...Ch. 7 - A bullet is fired into a block of wood sitting on...Ch. 7 - Consider two cases in which the same ball is...Ch. 7 - A car traveling at a speed of 22 m/s...Ch. 7 - A 1600-kg car traveling due east with a speed of...
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- A car of mass 750 kg traveling at a velocity of 27 m/s in the positive x-direction crashes into the rear of a truck of mass 1 500 kg that is at rest and in neutral at an intersection. If the collision is inelastic and the truck moves forward at 15.0 m/s, what is the velocity of the car after the collision? (See Section 6.3.)arrow_forwardA tennis ball of mass 57.0 g is held just above a basketball of mass 500 g as shown in Figure P9.17. With their centers vertically aligned, both balls are released from rest at the same time, to fall through a distance of 1.20 m. (a) Find the magnitude of the downward velocity with which the basketball reaches the ground. (b) Assume that an elastic collision with the ground instantaneously reverses the velocity of the basketball while the tennis ball is still moving down. Next, the two balls meet in an elastic collision. To what height does the tennis ball rebound? Figure P9.17arrow_forwardInitially, ball 1 rests on an incline of height h, and ball 2 rests on an incline of height h/2 as shown in Figure P11.40. They are released from rest simultaneously and collide elastically in the trough of the track. If m2 = 4 m1, m1 = 0.045 kg, and h = 0.65 m, what is the velocity of each ball after the collision?arrow_forward
- (a) Does the center of mass of a rocket in free space accelerate? Explain. (b) Can the speed of a rocket exceed the exhaust speed of the fuel? Explain.arrow_forwardInitially, ball 1 rests on an incline of height h, and ball 2 rests on an incline of height h/2 as shown in Figure P11.40. They are released from rest simultaneously and collide in the trough of the track. If m2 = 4 m1 and the collision is elastic, find an expression for the velocity of each ball immediately after the collision. FIGURE P11.40 Problems 40 and 41.arrow_forwardA 0.500-kg sphere moving with a velocity expressed as (2.00i3.00j+1.00k)m/s strikes a second, lighter sphere of mass 1.50 kg moving with an initial velocity of (1.00i+2.00j3.00k)m/s. (a) The velocity of the 0.500-kg sphere after the collision is (1.00i+3.00j8.00k)m/s. Find the final velocity of the 1.50-kg sphere and identify the kind of collision (elastic, inelastic, or perfectly inelastic). (b) Now assume the velocity of the 0.500-kg sphere after the collision is (0.250i+0.750j2.00k)m/s. Find the final velocity of the 1.50-kg sphere and identify the kind of collision. (c) What If? Take the velocity of the 0.500-kg sphere after the collision as (1.00i+3.00jak)m/s. Find the value of a and the velocity of the 1.50-kg sphere after an elastic collision.arrow_forward
- A 2.00-g particle moving at 8.00 m/s makes a perfectly elastic head-on collision with a resting 1.00-g object. (a) Find the speed of each particle after the collision. (b) Find the speed of each particle after the collision if the stationary particle has a mass of 10.0 g. (c) Find the final kinetic energy of the incident 2.00-g particle in the situations described in parts (a) and (b). In which case does the incident particle lose more kinetic energy?arrow_forwardStarting with equations m1v1=m1v1cos1+m2v2cos2 and 0=m1v1cos1+m2v2sin2 for conservation of momentum in the x- and y -directions and assuming that one object is originally stationary, prove that for an elastic collision of two objects of equal masses, 12mv12=12mv22+mv1v2cos(12) as discussed in the text.arrow_forwardThe magnitude of the net force exerted in the x direction on a 2.50-kg particle varies in time as shown in Figure P9.10 (page 244). Find (a) the impulse of the force over the 5.00-s time interval, (b) the final velocity the particle attains if it is originally at rest, (c) its final velocity if its original velocity is 2.00im/s, and (d) the average force exerted on the particle for the time interval between 0 and 5.00 s. Figure P9.10arrow_forward
- A soccer player runs up behind a 0.450-kg soccer ball traveling at 3.20 m/s and kicks it in the same direction as it is moving, increasing its speed to 12.8 m/s. (a) What is the change in the magnitude of the balls momentum? (b) What magnitude impulse did the soccer player deliver to the ball? (c) What magnitude impulse would be required to kick the ball in the opposite direction at 12.8 m/s, instead? (See Section 6.1.)arrow_forwardAn estimated force-time curve for a baseball struck by a bat is shown in Figure P9.13. From this curve, determine (a) the magnitude of the impulse delivered to the ball and (b) the average force exerted on the ball. Figure P9.13arrow_forwardA tennis ball of mass mt is held just above a basketball of mass mb, as shown in Figure P8.22. With their centers vertically aligned, both are released from rest at the same moment so that the bottom of the basketball falls freely through a height h and strikes the floor. Assume an elastic collision with the ground instantaneously reverses the velocity of the basketball while the tennis ball is still moving down because the balls have separated a bit while falling. Next, the two balls meet in an elastic collision. (a) To what height does the tennis ball rebound? (b) How do you account for the height in (a) being larger than h? Does that seem like a violation of conservation of energy? Figure P8.22arrow_forward
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Impulse Derivation and Demonstration; Author: Flipping Physics;https://www.youtube.com/watch?v=9rwkTnTOB0s;License: Standard YouTube License, CC-BY