1. What force is needed to make an object move in a centripetal force
circle?
2. Let the orbital radius of a planet be R and let the orbital T^2/R^3
period of the planet be T. What quantity is constant for
all planets orbiting the sun, assuming circular orbits?
3. A 0.140-kg baseball is dropped and reaches a speed 0.308 kgm/s up-
of 1.20 m/s just before it hits the ground. It rebounds wards
with a speed of 1.00 m/s. What is the change of the
ball¹s momentum?
4. A packing crate slides down an inclined ramp at con- a frictional force is
stant velocity. Thus we can deduce that acting on it
5. An inelastic collision of two objects is characterized total momentum of
by the following: the system is con-
served
6. A stone is held at a height h above the ground. A four times as much
second stone with four times the mass of the first one
is held at the same height. The gravitational potential
energy of the second stone compared to that of the
first stone is
7. What condition or conditions is/are necessary for ro- £Ä = 0
tational equilibrium?
8. An object weighs 432 N on the surface of the earth. 27 N
The earth has radius R. If the object is raised to a
height of 3R above the earth¹s surface, what is its
weight?
9. A force acts on an object, causing it to move parallel 20 J
to the force. The graph in the figure shows this force
as a function of the position of the object. How much
work does the force do as the object moves from 4 m
to 6 m?
10. 95 J
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, PHYS 1307
How much work would a child do while pulling a 12-kg
wagon a distance of 4.3 m with a 22 N force?
11. A pencil balanced on its tip such that it does not move is in unstable equi-
librium
12. The drag force is independent of the velocity of the false
object
13. A flatbed truck is carrying a 20.0-kg crate up a sloping B) 1.25 m/s2
road inclined 15.0° above the horizontal. The coeffi-
cient of static friction between the crate and the bed
is 0.400. What is the maximum acceleration that the
truck can have if the crate is to stay in place?
14. Two equal forces are applied to a door at the door- the first applied
knob. The first force is applied perpendicular to the perpendicular to
door; the second force is applied at 30° to the plane the door
of the door. Which force exerts the greater torque?
15. A boy and a girl are balanced on a massless seesaw. 1.8 m
The boy has a mass of 60 kg and the girl¹s mass is 50
kg. If the boy sits 1.5 m from the pivot point on one
side of the seesaw, where must the girl sit on the other
side for equilibrium?
16. An 82.0 kg-diver stands at the edge of a light 5.00-m 1.71 kN down-
diving board, which is supported by two pillars 1.60 m wards
apart, as shown in Figure 11-5. Find the force exerted
by pillar A.
17. Tensile stress and strain: Tensile strain is the ratio of the
change in length to
the original length.
18. What condition or conditions is/are necessary for sta- £
Fx=0, £
Fy=0, £Ä=0
tic equilibrium?
19. $1.62
2/6
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