CONCEPTUAL INTEGRATED SCIENCE (PEARSON+
3rd Edition
ISBN: 2818440059223
Author: Hewitt
Publisher: PEARSON+
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Chapter 4, Problem 4RAT
Which of these equations best illustrates the usefulness of automobile air bags?
(a)
(b)
(c)
(d)
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Before:
mA = 2.00 kg
mB = 3.00 kg
vA = +4.00 m/s vB = 0 m/s
After:
mA = 2.00 kg vA = −0.800 m/s mB = 3.00 kg vB = +3.20 m/s
A cylindrical tank, shown in the figure, has height 8 m and radius 4 m. Suppose the water tank is half-full of water. Determine the work required to
empty the tank by pumping the water to a level 6 m above the top of the tank. Use 1000 kg/m³ for the density of water and 9.8 m/s² for the
acceleration due to gravity.
4 m
Draw a y-axis in the vertical direction (parallel to gravity) and choose the center of the bottom of the tank as the origin. For 0 ≤ y ≤8, find the cross-sectional area A(y).
A(y) = (Type an exact answer, using as needed.)
8 m
A 62 kg man climbs the CN tower which is 0.55 km high in 30 min. How powerful is the man?
a) 1.9 X 10¹ W
b) 1.9 X 10² W
c) 1.1 X 10⁴ W
d) 1.9 X 10⁻¹ W
Chapter 4 Solutions
CONCEPTUAL INTEGRATED SCIENCE (PEARSON+
Ch. 4 - Which has a greater momentum-a heavy truck at rest...Ch. 4 - How can a huge ship have an enormous momentum when...Ch. 4 - How does impulse differ from force?Ch. 4 - What are the two ways in which the impulse exerted...Ch. 4 - For the same force, which cannon imparts the...Ch. 4 - Consider a baseball that is caught and thrown at...Ch. 4 - In the preceding question, which case requires the...Ch. 4 - Can you produce a net impulse on an automobile by...Ch. 4 - What does it mean to say that a quantity is...Ch. 4 - Distinguish between an elastic collision and an...
Ch. 4 - Railroad car A rolls at a certain speed and...Ch. 4 - If the equally massive cars of the preceding...Ch. 4 - When is energy most evident?Ch. 4 - What do we call the quantity force distance, and...Ch. 4 - In what units are work and energy measured?Ch. 4 - True or false: One watt is the unit of power...Ch. 4 - How many watts of power are expended when a force...Ch. 4 - A car is lifted a certain distance in a service...Ch. 4 - Two cars, one twice as heavy as the other, are...Ch. 4 - When a car travels at 50 km/h, it has kinetic...Ch. 4 - What is the evidence for saying whether or not...Ch. 4 - The brakes do a certain amount of work to stop a...Ch. 4 - Cite the law of energy conservation.Ch. 4 - What is the source of energy that powers a...Ch. 4 - Can a machine multiply input force? Input...Ch. 4 - A force of 50 N applied to the end of a lever...Ch. 4 - Is it possible to design a machine that has an...Ch. 4 - a Why is it a good idea to have your hand extended...Ch. 4 - In Figure 4.8, how does the force that Cassy...Ch. 4 - How will the impulse differ if Cassys hand bounces...Ch. 4 - We know that falling on a mat is preferable to...Ch. 4 - In terms of the impulse-momentum relationship,...Ch. 4 - The word burn is often used to describe the...Ch. 4 - In what sense are you powered by solar energy?Ch. 4 - Calculate the momentum of a 10-kg bowling ball...Ch. 4 - Show that the momentum of a 50-kg carton that...Ch. 4 - Calculate the impulse that occurs when an average...Ch. 4 - Show that an impulse of 100 Ns occurs when the...Ch. 4 - Calculate the work done when a force of 2 N moves...Ch. 4 - Show that 45 J of work is done when a 15-N force...Ch. 4 - Calculate the watts of power expended when a force...Ch. 4 - Show that 140 W of power is expended when a 20-N...Ch. 4 - How much PE does a 1.5 kg book gain when lifted 2...Ch. 4 - Show that there is a 600-J increase in potential...Ch. 4 - Calculate the KE of a 1-kg parrot flying at 6 m/s.Ch. 4 - Show that the KE of a 3-kg dog running at 4 m/s is...Ch. 4 - How much work is required to increase the kinetic...Ch. 4 - Show that a 50-J change in kinetic energy occurs...Ch. 4 - The mass and speed of three vehicles, A, B and C,...Ch. 4 - The roller coaster stats from rest at point A....Ch. 4 - Rank the scale readings from greatest to least...Ch. 4 - A car with a mass of 1000kgmoves at 20m/s. Show...Ch. 4 - A railroad diesel engine weighs four times as much...Ch. 4 - A 5kg fish swimming at 1m/s swallows an absent...Ch. 4 - What would be the speed of the larger fish if the...Ch. 4 - Jeannie Beanie mass 40kg, standing on a slippery...Ch. 4 - Consider the inelastic collision between the two...Ch. 4 - This question is typical on some drivers licence...Ch. 4 - In the hydraulic machine shown, it is observed...Ch. 4 - Consider a car with 25% efficient engine that and...Ch. 4 - When a cyclist expends 1000W of power to deliver...Ch. 4 - The decrease in PE of a freely falling object...Ch. 4 - A Mars vehicle is tested on Earth at a speed of...Ch. 4 - How can the momentum of a speeding bullet be the...Ch. 4 - Distinguish between force and impulse. .Ch. 4 - What are the two ways to increase or decrease...Ch. 4 - Why are automobiles designed to crumple upon...Ch. 4 - Why might a glass wine survive a fall onto a...Ch. 4 - If you throw an egg against a wall, the egg will...Ch. 4 - Railroad cars are loosely coupled so that there is...Ch. 4 - When a cannon with a long barrel is fired, the...Ch. 4 - Why does Howies block Figure 4.3 topple when the...Ch. 4 - You are on small raft next to a dock, and you jump...Ch. 4 - When travelling in your car at highway speed, the...Ch. 4 - Freddy Frog drops vertically from a tree onto a...Ch. 4 - Prob. 81TECh. 4 - Can something have energy without having momentum?...Ch. 4 - Which requires more work: stretching a strong...Ch. 4 - Why do you run out of breath when running up the...Ch. 4 - Distinguish between work and power.Ch. 4 - Relative to the floor in a library, books on the...Ch. 4 - If 300 joules is required to lift an object to a...Ch. 4 - When the velocity of an object is doubled, by what...Ch. 4 - You and a flight attended tosses a ball back and...Ch. 4 - A child can throw a baseball at 20 mph. Some...Ch. 4 - Prob. 91TECh. 4 - When a cannon with a long barrel is fired, the...Ch. 4 - Consider a pendulum swinging to and fro. At what...Ch. 4 - A physics instructor demonstrates energy...Ch. 4 - An apple hanging from a limb has potential energy...Ch. 4 - In an effort to combat wasteful habits, we often...Ch. 4 - Why bother using a machine if it cannot multiply...Ch. 4 - In the ideal pulley system shown, Block A has mass...Ch. 4 - Why is a punch more powerful with a bare fist than...Ch. 4 - A boxer can punch a heavy bag for more than an...Ch. 4 - A fully dressed person is at rest in the middle of...Ch. 4 - Why is it difficult for a firefighter to hold a...Ch. 4 - If a Mack truck and Honda Civic have a head-on...Ch. 4 - If an automobile has an engine that was 100%...Ch. 4 - Discuss the design of the roller coaster shown in...Ch. 4 - Consider the identical balls released from rest on...Ch. 4 - Consider the swinging balls apparatus shown. If...Ch. 4 - A freight train rolls along a track with...Ch. 4 - If Fast Freda doubles her running speed, she also...Ch. 4 - A big fish swims upon and swallows a small fish at...Ch. 4 - Which of these equations best illustrates the...Ch. 4 - Which of these equations is best for calculating...Ch. 4 - The power required to raise a 100-kg crate a...Ch. 4 - A model car with three times as much speed as...Ch. 4 - Nellie lifts a 100-N crate with an ideal pulley...Ch. 4 - When 100 J are put into a device that puts out 40...Ch. 4 - A simple machine CANNOT multiply a force. b...
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