EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Textbook Question
Chapter 4, Problem 29P
(I) Draw the free-body diagram for a basketball player (a) just before leaving the ground on a jump, and (b) while in the air. See Fig. 4-34.
FIGURE 4-34
Problem 28.
28.
- (a) Just before the player leaves the ground, the forces on the player are his weight and the floor pushing up on the player. If the player jumps straight up, then the force of the floor will be straight up – a normal force. See the first diagram. In this case, while touching the floor. FN > mg.
- (b) While the player is in the air. the only force on the player is their weight. See the second diagram.
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38.
39.
FIGURE 4-53
40
Problems 32 and 33.
mB
Mass ma rests on a
smooth horizontal
surface; mg hangs istongi inioq le
vertically.
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algne
13.0 kg and mB = 5.0 kg in Fig. 4–53,
33. (II) (a) If mA
determine the acceleration of each block. (b) If initially
is at rest 1.250 m from the edge of the table, how long
does it take to reach the edge of the table if the system is
allowed to move freely? (c) If mB
must ma be if the acceleration of the system is to be kept
at 100 g?
1.0 kg, how large
%3D
(II) A person pushes a 14.0-kg lawn mower at constant
speed with a force of F = 88.0 N directed along the handle,
which is at an angle of 45.0° to the horizontal (Fig. 4–58).
(a) Draw the free-body diagram showing all forces acting
on the mower. Calculate (b) the horizontal friction force
on the mower, then (c) the normal force exerted vertically
upward on the mower by the ground. (d) What force
must the person exert on the lawn mower to accelerate it
from rest to 1.5 m/s in 2.5 seconds, assuming the same
friction force?
F
45°
FIGURE 4-58
Problem 50.
A train locomotive is pulling two cars of the same mass behind it, Fig. 4–51. Determine the ratio of the tension in the coupling (think of it as a cord) between the locomotive and the first car (FT1), to that between the first car and the second car (FT2), for any nonzero acceleration of the train. You need to draw a FBD for each car.
Chapter 4 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
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