INQUIRY INTO PHYSICS-EBOOK
8th Edition
ISBN: 9780357540039
Author: Ostdiek
Publisher: CENGAGE L
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Chapter 2, Problem 33Q
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.)
33. Six identical cars are towing identical trailers at constant, albeit different, speeds along level roads io the desert. The trailers carry different loads, so their masses vary. The circumstances of each vehicle are shown here. Using the letter identifiers, rank the difference between the magnitude of the force exerted by the car on the trailer and the magnitude of the force exerted by the trailer on the car for each situation from greatest to least. If any situations have the same difference, give them the same ranking. Explain your reasoning in forming your rankings.
(a) Trailer load = 1000 kg; vehicle speed = 20 m/s
(b) Trailer load = 2000 kg; vehicle speed = 20 m/s
(c) Trailer load = 4000 kg; vehicle speed = 40 m/s
(d) Trailer load = 4000 kg; vehicle speed = 10 m/s
(e) Trailer load = 2000 kg; vehicle speed =10 m/s
(f) Trailer load = 1000 kg; vehicle speed =10 m/s
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4.46
The two blocks in Fig. P4.46 are connected
by a heavy uniform rope with a mass of 4.00 kg. An up-
ward force of 200 N is applied as shown. (a) Draw three
free-body diagrams: one for the 6.00 kg block, one for
B
the 4.00 kg rope, and another one for the 5.00 kg block. For each force,
indicate what object exerts that force. (b) What is the acceleration of the
system? (c) What is the tension at the top of the heavy rope? (d) What is
the tension at the midpoint of the rope?
Figure P4.46
F= 200 N
4.00 kg
6.00 kg
5.00 kg
4.35 ⚫ Two adults and a child want to push a wheeled cart in the direc-
tion marked x in Fig. P4.35 (next page). The two adults push with hori-
zontal forces F and F as shown. (a) Find the magnitude and direction of
the smallest force that the child should exert. Ignore the effects of friction.
(b) If the child exerts the minimum force found in part (a), the cart ac-
celerates at 2.0 m/s² in the +x-direction. What is the weight of the cart?
Figure P4.35
F₁ = 100 N
60°
30°
F2 = 140 N
4.21 ⚫ BIO World-class sprinters can accelerate out of the starting
blocks with an acceleration that is nearly horizontal and has magnitude
15 m/s². How much horizontal force must a 55 kg sprinter exert on the
starting blocks to produce this acceleration? Which object exerts the
force that propels the sprinter: the blocks or the sprinter herself?
Chapter 2 Solutions
INQUIRY INTO PHYSICS-EBOOK
Ch. 2 - Give three important “laws” that characterize...Ch. 2 - Describe the adhesion model of friction.Ch. 2 - Prob. 1MACh. 2 - Name a key invention that Newton contributed to...Ch. 2 - What important mathematical “tool” did Newton...Ch. 2 - Reread Section 2.7 on the law of universal...Ch. 2 - In this chapter, you've encountered a large number...Ch. 2 - (Indicates a review question. which means it...Ch. 2 - Prob. 2QCh. 2 - (Indicates a review question, which means it...
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