Homework
Chapter 1, 2
Chapter 1
1. The age of the universe is thought to be about 14 billion years. Assuming two significant
figures, write this in powers of ten in (a) years, (b) seconds
2. How many significant figures do each of the following numbers ha
Homework
Chapter 4
Chapter 4
3. How much tension must a rope withstand if it is used to accelerate a 960-kg car horizontally
along a frictionless surface at 1.20 m/s2?
5.
A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal for
Homework
Chapter 11, 13, 14
Chapter 11
4. A fishermans scale stretches 3.6 cm when a 2.7-kg fish hangs on it. (a) What is the spring
stiffness constant and (b) what will be the amplitude and frequency of vibration if the fish is
pulled down 2.5 cm more an
Homework
Chapter 4
Chapter 4
3. How much tension must a rope withstand if it is used to accelerate a 960-kg car horizontally
along a frictionless surface at 1.20 m/s2?
5.
A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal for
Homework
Chapter 5
Chapter 5
1. A child sitting 1.10 m from the center of a merry-go-round moves with a speed of 1.25 m/s.
Calculate (a) the centripetal acceleration of the child, and (b) the net horizontal force exerted
on the child (mass = 25.0 kg).
7.
Homework
Chapter 7, 8
Chapter 7
3. A 0.145-kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward
the pitchers at 52.0 m/s. If the contact time between bat and ball is 3.00 10-3 s, calculate
the average force between the ba
Homework 3
Chapter 14, 15, 16, 17, 18, 19
Chapter 14
35. (a) How much power is radiated by a tungsten sphere (e = 0.35) of radius 22 cm at a temperature of 25C? (b)
If the sphere is enclosed in a room whose walls are kept at -5C, what is the net flow rate
Homework 4
Chapter 16, 17
Chapter 16
7. Two charged spheres are 8.45 cm apart. They are moved, and the force on each of them is
found to have been tripled. How far apart are they now?
10. Compare the electrical force holding the electron in orbit (r = 0.5