University Physics Volume 1
18th Edition
ISBN: 9781938168277
Author: William Moebs, Samuel J. Ling, Jeff Sanny
Publisher: OpenStax - Rice University
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Textbook Question
Chapter 9, Problem 56P
Two asteroids collide and stick together. The first asteroid has mass of
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A spaceship has a mass of 600 kg at rest and accelerates to high speed. A person at rest on the ground observes that the spaceship has 1000 kg. How fast (in x 108 m/s) is the spaceship?
An astronaut whose mass is 80 kg carries an empty oxygen tank with a mass of 10 kg. She throws the tank away from herself with a speed of 2.0 m/s. With what velocity does she move off into space? How long would it take her to move 200 m back to the spaceship?
A spaceship at rest relative to a nearby star in interplanetary space has a total mass of 2.00 ✕ 104 kg. Its engines fire at
t = 0,
steadily burning fuel at 79.3 kg/s with an exhaust speed of 4.50 ✕ 103 m/s. Calculate the spaceship's acceleration at
t = 0,
mass at
t = 135 s,
acceleration at
t = 135 s,
and speed at
t = 135 s,
relative to the same nearby star.
HINT
(a)
acceleration at
t = 0
(Enter the magnitude. Enter your answer in m/s2.)
m/s2
(b)
mass at
t = 135 s
(Enter your answer in kg.)
kg
(c)
acceleration at
t = 135 s
(Enter the magnitude. Enter your answer in m/s2.)
m/s2
(d)
speed at
t = 135 s
(Enter your answer in m/s.)
m/s
Chapter 9 Solutions
University Physics Volume 1
Ch. 9 - Check Your Understanding The U.S. Air Force uses...Ch. 9 - Check Your Understanding What if we had assumed...Ch. 9 - Check Your Understanding Suppose the second,...Ch. 9 - Check Your Understanding Would the ball’s change...Ch. 9 - Check Your Understanding Even if there were some...Ch. 9 - Check Your Understanding The changes of momentum...Ch. 9 - Check Your Understanding There is a second...Ch. 9 - Check Your Understanding Suppose there had been no...Ch. 9 - Check Your Understanding Suppose the initial...Ch. 9 - Check Your Understanding Notice that the mass of...
Ch. 9 - Check Your Understanding Suppose we included the...Ch. 9 - Check Your Understanding Suppose you have a...Ch. 9 - Check Your Understanding How would the firework...Ch. 9 - Check Your Understanding What is the physical...Ch. 9 - An object that has a small mass and an object that...Ch. 9 - An object that has a small mass and an object that...Ch. 9 - Is it possible for a small force to produce a...Ch. 9 - Why is a 10-m fall onto concrete far more...Ch. 9 - What external force is responsible for changing...Ch. 9 - A piece of putty and a tennis ball with the same...Ch. 9 - Under what circumstances is momentum conserved?Ch. 9 - Can momentum be conserved for a system if there...Ch. 9 - Explain in terms of momentum and Newton’s laws how...Ch. 9 - Can objects in a system have momentum while the...Ch. 9 - A sprinter accelerates out of the starting blocks....Ch. 9 - A rocket in deep space (zero gravity) accelerates...Ch. 9 - Two objects of equal mass are moving with equal...Ch. 9 - Describe a system for which momentum is conserved...Ch. 9 - Momentum for a system can be conserved in one...Ch. 9 - Suppose a fireworks shell explodes, breaking into...Ch. 9 - It is possible for the velocity of a rocket to be...Ch. 9 - An elephant and a hunter are having a...Ch. 9 - A skater of mass 40 kg is carrying a box of mass 5...Ch. 9 - A car of mass 2000 kg is moving with a constant...Ch. 9 - The mass of Earth is 5.971024kg and its orbital...Ch. 9 - If a rainstorm drops 1 cm of rain over an area of...Ch. 9 - What is the average momentum of an avalanche that...Ch. 9 - What is the average momentum of a 70.0-kg sprinter...Ch. 9 - A 75.0-kg person is riding in a car moving at 20.0...Ch. 9 - One hazard of space travel is debris left by...Ch. 9 - A cruise ship with a mass of 1.00107kg strikes a...Ch. 9 - Calculate the final speed of a 110-kg rugby player...Ch. 9 - Water from a fire hose is directed horizontally...Ch. 9 - A 0.450-kg hammer is moving horizontally at 7.00...Ch. 9 - Prob. 31PCh. 9 - The x-component of a force on a 46-g golf ball by...Ch. 9 - A hockey puck of mass 150 g is sliding due east on...Ch. 9 - A ball of mass 250 g is thrown with an initial...Ch. 9 - Prob. 35PCh. 9 - Two identical pucks collide elastically on an air...Ch. 9 - The figure below shows a bullet of mass 200 g...Ch. 9 - A 20-kg child is coasting at 3.3 m/s over flat...Ch. 9 - A 4.5 kg puffer fish expands to 40 of its mass by...Ch. 9 - Explain why a cannon recoils when it fires a...Ch. 9 - Two figure skaters are coasting in the same...Ch. 9 - A 2000-kg railway freight car coasts at 4.4 m/s...Ch. 9 - A 5.50-kg bowling ball moving at 9.00 m/s collides...Ch. 9 - Ernest Rutherford (the first New Zealander to be...Ch. 9 - A 90.0-kg ice hockey player hits a 0.150-kg puck,...Ch. 9 - A 100-g firecracker is launched vertically into...Ch. 9 - In an elastic collision, a 400-kg bumper car...Ch. 9 - Repeat the preceding problem if the mass of the...Ch. 9 - An alpha particle (4He) undergoes an elastic...Ch. 9 - You are standing on a very slippery icy surface...Ch. 9 - A 35-kg child rides a relatively massless sled...Ch. 9 - A boy sleds down a hill and onto a frictionless...Ch. 9 - Prob. 53PCh. 9 - A billiard ball, labeled 1, moving horizontally...Ch. 9 - A projectile of mass 2.0 kg is fired in the air at...Ch. 9 - Two asteroids collide and stick together. The...Ch. 9 - Prob. 57PCh. 9 - A proton traveling at 3.0106m/s scatters...Ch. 9 - Prob. 59PCh. 9 - A family is skating. The father (75 kg) skates at...Ch. 9 - Prob. 61PCh. 9 - Two cars of the same mass approach an extremely...Ch. 9 - Three point masses are placed at the corners of a...Ch. 9 - Two particles of masses m1 and m2 separated by a...Ch. 9 - Two particles of masses m1 and m2 separated by a...Ch. 9 - Two particles of masses m1 and m2 , move uniformly...Ch. 9 - Two particles of masses m1 and m2 move uniformly...Ch. 9 - Find the center of mass of a one-meter long rod,...Ch. 9 - Find the center of mass of a rod of length L whose...Ch. 9 - Find the center of mass of a rectangular block of...Ch. 9 - Find the center of mass of a rectangular material...Ch. 9 - A cube of side a is cut out of another cube of...Ch. 9 - Find the center of mass of a cone of uniform...Ch. 9 - Find the center of mass of a thin wire of mass in...Ch. 9 - Find the center of mass of a uniform thin...Ch. 9 - Find the center of mass of a sphere of mass M and...Ch. 9 - (a) A 5.00-kg squid initially at rest ejects 0.250...Ch. 9 - A rocket takes off from Earth and reaches a speed...Ch. 9 - Repeat the preceding problem but for a rocket that...Ch. 9 - How much fuel would be needed for a 1000-kg rocket...Ch. 9 - What exhaust speed is required to accelerate a...Ch. 9 - Unreasonable Results Squids have been reported to...Ch. 9 - Two 70-kg canoers paddle in a single, 50-kg canoe....Ch. 9 - Which has a larger magnitude of momentum: a...Ch. 9 - A driver applies the brakes and reduces the speed...Ch. 9 - You friend claims that momentum is mass multiplied...Ch. 9 - Dropping a glass on a cement floor is more likely...Ch. 9 - Your 1500-kg sports car accelerates from 0 to 30...Ch. 9 - A ball of mass m is dropped. What is the formula...Ch. 9 - Repeat the preceding problem, but including a drag...Ch. 9 - A 5.0-g egg falls from a 90-cm-high counter onto...Ch. 9 - A car crashes into a large tree that does not...Ch. 9 - Two hockey players approach each other head on,...Ch. 9 - You are coasting on your 10-kg bicycle at 15 m/s...Ch. 9 - A load of gravel is dumped straight down into a...Ch. 9 - Two carts on a straight track collide head on. The...Ch. 9 - A 100-kg astronaut finds himself separated from...Ch. 9 - Derive the equations giving the final speeds for...Ch. 9 - Repeat the preceding problem for the case when the...Ch. 9 - A child sleds down a hill and collides at 5.6 m/s...Ch. 9 - For the preceding problem, find the final speed of...Ch. 9 - A 90-kg football player jumps vertically into the...Ch. 9 - Three skydivers are plummeting earthward. They are...Ch. 9 - Two billiard balls are at rest and touching each...Ch. 9 - Prob. 105APCh. 9 - Prob. 106APCh. 9 - Repeat the preceding problem if the balls collide...Ch. 9 - Repeat the preceding problem if the balls collide...Ch. 9 - Where is the center of mass of a semicircular wire...Ch. 9 - Where is the center of mass of a slice of pizza...Ch. 9 - If 1 of the Earth’s mass were transferred to the...Ch. 9 - You friend wonders how a rocket continues to climb...Ch. 9 - To increase the acceleration of a rocket, should...Ch. 9 - A 65-kg person jumps from the first floor window...Ch. 9 - Two projectiles of mass m1 and m2 , are fired at...Ch. 9 - Two identical objects (such as billiard balls)...Ch. 9 - A ramp of mass M is at rest on a horizontal...Ch. 9 - Find the center of mass of the structure given in...
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