Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Question
Chapter 9, Problem 34PQ
(a)
To determine
Whether work done is positive, negative, or zero.
(b)
To determine
Whether work done is positive, negative, or zero, when a man moves a child in a stroller across a frictionless floor so that the man and child glide together at a constant speed.
(c)
To determine
Whether work done is positive, negative, or zero, when a man prevents a child in a stroller from accelerating as it travels downhill.
(d)
To determine
Whether work done is positive, negative, or zero, when a man pushes the Great Wall of China, yet it remains motionless.
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C.
Suppose the resultant force acted on an object that was at the origin and resulted in the displacement
vector d =. How much work was done by the resultant force on the object? Use your answer from part b
as appropriate.
d.
Using your results from parts b and c, what is the measure of the angle between the resultant force and
displacement vector?
About 50,000 years ago, a meteor crashed into the earth near
present-day Flagstaff, Arizona. Measurements from 2005
estimate that this meteor had a mass of about 1.4 × 10° kg
(around 150,000 tons) and hit the ground at a speed of
12 km/s.
Part A
How much kinetic energy did this meteor deliver to the ground?
Express your answer with the appropriate units.
For related problem-solving tips and strategies, you may want
to view a Video Tutor Solution of Using work and energy to
calculate speed.
?
HA
K =
Value
Units
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Part B
How does this energy compare to the energy released by a 1.0 megaton nuclear bomb? (A megaton bomb releases the same energy as a million tons
of TNT, and 1.0 ton of TNT releases 4.184 x 10° J of energy.)
Express your answer using two significant figures.
ΑΣφ
?
Emeteor
Ebomb
A force F is applied to a 2.0 kg, radio-controlled model
car parallel to the x-axis as it moves along a straight
track. The x-component of the force varies with the
x-coordinate of the car as shown in the figure (Figure 1).
Part A
Calculate the work done by the force F when the car moves from x = 0 to x = 3.0 m.
Express your answer with the appropriate units.
Wo-3.0 =
Value
Units
Figure
1 of 1
Part B
F, (N)
Calculate the work done by the force F when the car moves from x = 3.0 m to x = 4.0 m.
2
Express your answer with the appropriate units.
1
x (m)
?
1
2 3 4 5
-1
W3.0–4.0 =
Value
Units
-2
Chapter 9 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 9.4 - In the three cases shown in Figure 9.11, a force...Ch. 9.6 - Prob. 9.2CECh. 9.6 - Prob. 9.3CECh. 9.7 - Prob. 9.4CECh. 9.7 - Prob. 9.5CECh. 9.9 - Prob. 9.6CECh. 9 - Pick an isolated system for the following...Ch. 9 - Prob. 2PQCh. 9 - Prob. 3PQCh. 9 - Prob. 4PQ
Ch. 9 - Prob. 5PQCh. 9 - Prob. 6PQCh. 9 - Prob. 7PQCh. 9 - A 537-kg trailer is hitched to a truck. Find the...Ch. 9 - Prob. 9PQCh. 9 - A helicopter rescues a trapped person of mass m =...Ch. 9 - Prob. 11PQCh. 9 - An object is subject to a force F=(512i134j) N...Ch. 9 - Prob. 13PQCh. 9 - Prob. 14PQCh. 9 - Prob. 15PQCh. 9 - Prob. 16PQCh. 9 - Prob. 17PQCh. 9 - Prob. 18PQCh. 9 - Prob. 19PQCh. 9 - Prob. 20PQCh. 9 - Prob. 21PQCh. 9 - Prob. 22PQCh. 9 - A constant force of magnitude 4.75 N is exerted on...Ch. 9 - In three cases, a force acts on a particle, and...Ch. 9 - An object of mass m = 5.8 kg moves under the...Ch. 9 - A nonconstant force is exerted on a particle as it...Ch. 9 - Prob. 27PQCh. 9 - Prob. 28PQCh. 9 - Prob. 29PQCh. 9 - A particle moves in the xy plane (Fig. P9.30) from...Ch. 9 - A small object is attached to two springs of the...Ch. 9 - Prob. 32PQCh. 9 - Prob. 33PQCh. 9 - Prob. 34PQCh. 9 - Prob. 35PQCh. 9 - Prob. 36PQCh. 9 - Prob. 37PQCh. 9 - Prob. 38PQCh. 9 - A shopper weighs 3.00 kg of apples on a...Ch. 9 - Prob. 40PQCh. 9 - Prob. 41PQCh. 9 - Prob. 42PQCh. 9 - Prob. 43PQCh. 9 - Prob. 44PQCh. 9 - Prob. 45PQCh. 9 - Prob. 46PQCh. 9 - Prob. 47PQCh. 9 - Prob. 48PQCh. 9 - Prob. 49PQCh. 9 - A small 0.65-kg box is launched from rest by a...Ch. 9 - A small 0.65-kg box is launched from rest by a...Ch. 9 - A horizontal spring with force constant k = 625...Ch. 9 - A box of mass m = 2.00 kg is dropped from rest...Ch. 9 - Prob. 54PQCh. 9 - Return to Example 9.9 and use the result to find...Ch. 9 - Prob. 56PQCh. 9 - Crall and Whipple design a loop-the-loop track for...Ch. 9 - Prob. 58PQCh. 9 - Calculate the force required to pull a stuffed toy...Ch. 9 - Prob. 60PQCh. 9 - Prob. 61PQCh. 9 - Prob. 62PQCh. 9 - An elevator motor moves a car with six people...Ch. 9 - Prob. 64PQCh. 9 - Figure P9.65A shows a crate attached to a rope...Ch. 9 - Prob. 66PQCh. 9 - Prob. 67PQCh. 9 - Prob. 68PQCh. 9 - Prob. 69PQCh. 9 - Prob. 70PQCh. 9 - Prob. 71PQCh. 9 - Estimate the power required for a boxer to jump...Ch. 9 - Prob. 73PQCh. 9 - Prob. 74PQCh. 9 - Prob. 75PQCh. 9 - Prob. 76PQCh. 9 - Prob. 77PQCh. 9 - Prob. 78PQCh. 9 - Prob. 79PQCh. 9 - A block of mass m = 0.250 kg is pressed against a...Ch. 9 - On a movie set, an alien spacecraft is to be...Ch. 9 - Prob. 82PQCh. 9 - A spring-loaded toy gun is aimed vertically and...Ch. 9 - Prob. 84PQCh. 9 - The motion of a box of mass m = 2.00 kg along the...Ch. 9 - Prob. 86PQCh. 9 - Prob. 87PQCh. 9 - Prob. 88PQ
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