Physics, 7th Edition
Chapter 9 Impulse and Momentum
Chapter 9. Impulse and Momentum
9-1. A 0.5-kg wrench is dropped from a height of 10 m. What is its momentum just before it
strikes the floor? (First find the velocity from conservation of energy.)
mgh =
Physics, 6th Edition
Chapter 15. Fluids
Chapter 15. FLUIDS
Density
15.1. What volume does 0.4 kg of alcohol occupy? What is the weight of this volume?
m
;
V
V=
m
0.4 kg
;
790 kg/m 2
V = 5.06 x 10-4 m3
W = DV = gV = 790 kg/m3)(9.8 m/s2)(5.06 x 10-4 m3);
Physics, 7th Edition
Chapter 10. Uniform Circular Motion
Chapter 10. Uniform Circular Motion
Centripetal Acceleration
10-1. A ball is attached to the end of a 1.5 m string and it swings in a circle with a constant speed
of 8 m/s. What is the centripetal a
Physics, 7th Edition
Chapter 7 Newtons Second Law
Chapter 7. Newtons Second Law
Newtons Second Law
7-1. A 4-kg mass is acted on by a resultant force of (a) 4 N, (b) 8 N, and (c) 12 N. What are the
resulting accelerations?
(a) a
4N
1 m/s2
4 kg
(b) a
8N
Physics, 7th Edition
Chapter 14. Simple Harmonic Motion
Chapter 14. Simple Harmonic Motion
Periodic Motion, Hookes Law, and Newtons Second Law
14-1. A rock swings in a circle at constant speed on the end of a string, making 50 revolutions in
30 s. What is
Physics, 7th Edition
Chapter 12. Simple Machines
Chapter 12. Simple Machines
Simple Machines, Efficiency, and Mechanical Advantage
12-1. A 25 percent efficient machine performs external work of 200 J. What input work is
required?
Work out
E
;
Work in
Work
Physics, 7th Edition
Chapter 8 Work, Energy, and Power
Chapter 8. Work, Energy, and Power
Work
8-1. What is the work done by a force of 20 N acting through a parallel distance of 8 m? What
force will do the same work through a distance of 4 m?
Work = (20
Physics, 7th Edition
Chapter 13. Elasticity
Chapter 13. Elasticity
Elastic Properties of Matter
13-1. When a mass of 500 g is hung from a spring, the spring stretches 3 cm. What is the spring
constant? [ m = 0.500 kg; x = 0.03 m, F = W = mg ]
F = -kx;
F (
Physics, 7th Edition
Chapter 16. Temperature and Expansion
Chapter 16. Temperature and Expansion
16-1. Body temperature is normal at 98.60F. What is the corresponding temperature on the
Celsius scale?
tC 5 9 (t F 320 ) 5 9 (98.60 320 ) ;
tC = 370C
16-2. T
Physics, 7th Edition
Chapter 6 Uniform Acceleration
Chapter 6. Uniform Acceleration
Problems:
Speed and Velocity
6-1. A car travels a distance of 86 km at an average speed of 8 m/s. How many hours were
required for the trip?
x vt
t
86,000 m
1h
10,750 s
Physics, 7th Ed.
Chapter 4. Translational Equilibrium and Friction
Chapter 4. Translational Equilibrium and Friction.
Note: For all of the problems at the end of this chapter, the rigid booms or struts are considered
to be of negligible weight. All forces
Physics, 7th Edition
Chapter 5 Torque and Rotational Equilibrium
Chapter 5. Torque and Rotational Equilibrium
Unit Conversions
5-1. Draw and label the moment arm of the force F about an axis at point A in Fig. 5-11a. What
is the magnitude of the moment ar