Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Textbook Question
Chapter 4, Problem 22P
(II) (a) What is the acceleration of two falling sky divers (mass = 132 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight? (b) After popping open the parachute, the divers descend leisurely to the ground at constant speed. What now is the force of air resistance on the sky divers and their parachute? See Fig. 4–32.
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A crane's trolley at point P in Fig. 4–63 moves for a few
seconds to the right with constant acceleration, and the
870-kg load hangs on a light cable at a 5.0° angle to the
vertical as shown. What is the acceleration of the trolley
and load?
P
i 5.0°
FIGURE 4–63
Problem 69.
Bob traverses a chasm by stringing a rope between a tree
on one side of the chasm and a tree on the opposite side,
25 m away, Fig. 4–65. Assume the rope can provide a
tension force of up to 29 kN before breaking, and use a
"safety factor" of 10 (that is, the rope should only be
required to undergo a tension force of 2.9 kN). (a) If Bob's
mass is 72.0 kg, determine the distance x that the rope
must sag at a point halfway across if it is to be within its
recommended safety range. (b) If the rope sags by only one-
fourth the distance found in (a), determine the tension
force in the rope. Will the rope break?
FIGURE 4–65 Problem 74.
A bear sling, Fig. 4–40, is used in some national parks for
placing backpackers' food out of the reach of bears. As the
backpacker raises the pack by pulling down on the rope, the
force F needed:
(a) decreases as the pack rises until the rope is straight
across.
(b) doesn't change.
(c) increases until the rope is straight.
(d) increases but the rope always sags where the pack
hangs.
F
FIGURE 4–40
MisConceptual
Question 4.
Chapter 4 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 4.4 - Suppose you watch a cup slide on the (smooth)...Ch. 4.5 - Return to the first Chapter-Opening Question, page...Ch. 4.5 - A massive truck collides head-on with a small...Ch. 4.5 - If you push on a heavy desk, does it always push...Ch. 4.7 - A 10.0-kg box is dragged on a horizontal...Ch. 4 - Why does a child in a wagon seem to fall backward...Ch. 4 - A box rests on the (frictionless) bed of a truck....Ch. 4 - If the acceleration of an object is zero, are no...Ch. 4 - If an object is moving, is it possible for the net...Ch. 4 - Only one force acts on an object. Can the object...
Ch. 4 - When a golf ball is dropped to the pavement, it...Ch. 4 - If you walk along a log floating on a lake, why...Ch. 4 - Why might your foot hurt if you kick a heavy desk...Ch. 4 - When you are running and want to slop quickly, you...Ch. 4 - (a) Why do you push down harder on the pedals of a...Ch. 4 - A father and his young daughter are ice skating....Ch. 4 - Suppose that you are standing on a cardboard...Ch. 4 - A stone hangs by a fine thread from the ceiling,...Ch. 4 - The force of gravity on a 2-kg rock is twice as...Ch. 4 - Would a spring scale carried to the Moon give...Ch. 4 - You pull a box with a constant force across a...Ch. 4 - When an object falls freely under the influence of...Ch. 4 - Compare the effort (or force) needed to lift a...Ch. 4 - Which of the following objects weighs about 1 N:...Ch. 4 - According to Newtons third law. each team in a tug...Ch. 4 - When you stand still on the ground, how large a...Ch. 4 - Whiplash sometimes results from an automobile...Ch. 4 - Mary exerts an upward force of 40N to hold a bag...Ch. 4 - A bear sling, Fig. 430, in used in some national...Ch. 4 - (I) What force is needed to accelerate a child on...Ch. 4 - (1) A net force of 265N accelerates a bike and...Ch. 4 - (I) What is the weight of a 68-kg astronaut (a) on...Ch. 4 - (I) How much tension must a rope withstand if it...Ch. 4 - (II) Superman must stop a 120-km/h train in 150 m...Ch. 4 - (II) What average force is required to stop a...Ch. 4 - (II) Estimate the average force exerted by a...Ch. 4 - (II) A 0.140-kg baseball traveling 35.0 m/s...Ch. 4 - (II) A fisherman yanks a fish vertically out of...Ch. 4 - (II) A 20.0-kg box rests on a table. 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- The normal force on an extreme skier descending a very steep slope (Fig. 4–42) can be zero if(a) his speed is great enough.(b) he leaves the slope (no longer touches the snow).(c) the slope is greater than 75°.(d) the slope is vertical (90°).arrow_forwardWhat causes the boat in Fig. 4–41 to move forward?(a) The force the man exerts on the paddle.(b) The force the paddle exerts on the water.(c) The force the water exerts on the paddle.(d) The motion of the water itself.arrow_forwardAn 18-kg child is riding in a child-restraint chair, securely fastened to the seat of a car (Fig. 4–77). Assume the car has speed 45 km/h when it hits a tree and is brought to rest in 0.20 s. Assuming constant deceleration during the colli- sion, estimate the net horizontal force F that the straps of the restraint chair exert on the child FIGURE 4–77 to hold her in the chair. Problem 97.arrow_forward
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