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 12CQ
Suppose you move your hand forward to meet the egg when performing the egg-toss game. Will this be more or less likely to break the egg than moving your hand backward? Explain. (See everyday phenomenon box 7.1.)
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A ballistic pendulum is a device for measuring bullet speeds. One of the simplest versions consists of a block of wood hanging from two long cords. (Two cords are used so that the bottom face of the block remains parallel to the floor as the block swings upward.) A 9.7-g bullet is fired into a ballistic pendulum in which the block has an inertia of 4.5 kg, and the block rises 60 mm above its initial position.
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I need some help! I am really confused. I do not know how to solve this!
A block of mass m = 4.4 kg, moving on frictionless surface with a speed vi = 9.2 m/s, makes a perfectly elastic collision with a block of mass M at rest. After the collision, the 4.4 kg block recoils with a speed of vf = 2.5 m/s. Mass m is closest to:
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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 160 g baseball is thrown with a speed of 20 m/s. It is hit straight back toward the pitcher at a speed of 40 m/s. What is the maximum force that the bat exerts on the ball if the impulsive force registers at 0.60 milliseconds?arrow_forwardA condition of the law of conservation of momentum is that no external forces are at play. Look at each of the following situations and choose if the law applies to it. Select all that apply. A. Two kinetic carts collide on a frictionless surface.B. A bullet strikes a wooden block, causing the block to accelerate from rest.C. Two cars collide on a dirt road where the force of friction is high.D. A coin sliding on a table experiences a frictional force.arrow_forwardTwo initially stationary carts, A and B, are pushed across a frictionless horizontal surface by the same horizontal force. Cart B is heavier than Cart A, but both are pushed for the same time. After the push, which cart has the greater final momentum? They have the same final momentum Cart B Cart A After the push, which cart has the greater final kinetic energy? Cart B They have the same final kinetic energy Cart Aarrow_forward
- A skateboarder changes his body posture to be able to complete a spin. What best explains this? a) Conservation of Linear Momentum b) Conservation of Energy c) Conservation of Angular Momentum d) Newton’s 3rd Lawarrow_forwardI figure out how to do find the speed before collision but I’m stuck on how to find the speeds of the ball and the block immediately after the collision.arrow_forward1. This physical quantity is the inertia of motion. 2. which of the following is conserved in inelastic collision a. Kinetic energy b. Momentum c.potential energy d.impulse 3.Which of the following quantities are conserved (pick two) in elastic collision? a. Kinetic energy b. Momentum c. Potential energy d. Impulse 4. Suppose a fly is hit by the windshield of a moving truck, which of the following correctly describes the forces acting on both truck and fly upon collisionA. they are equal and oppositely directedB. the fly experiences a larges force since it diesC. the truck experiences a larger force since it is at a greater speedD. the force on the fly is smaller since it is moving slower than the truckarrow_forward
- Dan is gliding on his skateboard at 2.0 m/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.0 m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 7.0 kg . How fast is Dan going as his feet hit the ground? Express your answer using two significant figures.arrow_forwardA particle is suspended from a post on top of a can by a light string of length L. as shown in Figure P9.57a. The can and particle are initially moving to the right at constant speed the with the string vertical. The can suddenly comes to rest when it runs into and sticks to a bumper as shown in Figure P9.57b. The suspended panicle swings through an angle . (a) Show that the original speed of the cart can be computed from. vi=2gL(1cos) (b) If the bumper is still exerting a horizontal force on the cart when the hanging panicle is at its maximum angle forward from the vertical. at what moment does the bumper stop exerting a horizontal force?arrow_forwardThis is a symbolic version of Problem 23. A girl of mass mG is standing on a plank of mass mp. Both are originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity vGP to the right relative to the plank. (The subscript GP denotes the girl relative to plank.) (a) What is the velocity vPI of the plank relative to the surface of the ice? (b) What is the girls velocity vGI relative to the ice surface?arrow_forward
- Two blocks are free to slide along the frictionless, wooden track shown in Figure P8.19. The block of mass m1 = 5.00 kg is released from the position shown, at height h = 5.00 m above the flat part of the track. Protruding from its front end is the north pole of a strong magnet, which repels the north pole of an identical magnet embedded in the back end of the block of mass m2 = 10.0 kg, initially at rest. The two blocks never touch. Calculate the maximum height to which m1 rises after the elastic collision. Figure P8.19arrow_forwardA massive tractor is rolling down a country road. In a perfectly inelastic collision, a small sports car runs into the machine from behind. (i) Which vehicle experiences a change in momentum of larger magnitude? (a) The car does. (b) The tractor does. (c) Their momentum changes are the same size. (d) It could be either vehicle. (ii) Which vehicle experiences a larger change in kinetic energy? (a) The car does. (b) The tractor does. (c) Their kinetic energy changes are the same size. (d) It could be either vehicle.arrow_forwardAn open box slides across a frictionless, icy surface of a frozen lake. What happens to the speed of the box as water from a rain shower falls vertically downward into the box? Explain.arrow_forward
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