Homework 5
Chapter 9
Problem 1. By what fraction does the mass of a m = 10 g, k = 500 N/m spring increase when it is compressed by 1 cm?
m
m
1 cm
Compression increases the potential energy of the spring by
U =
1
1
2
k x2 = 500 N/m (0.01 m) = 25.0 mJ .
2
2
Homework 1
Chapters 12 and 13
Problem 1. It would take a huge potential energy barrier to conne an electron to the nucleus of an atom (diameter
d 10 fm). (a) Use the Heisenberg uncertainty principle to nd the momentum uncertainty of such a bound electron.
Homework 4
Chapter 28
Problem 1. In Homework 3, you showed that the sun emits 3.87 1026 W of power. (a) Use Stefans law to calculate the
surface temperature at the photosphere (r = 6.96 108 m). (b) Estimate the power needed to produce the same spectrum
wi
Homework 3
Chapters 24 and 27
Problem 1. Assume that the intensity of solar radiation incident on the cloudtops of the Earth is 1370 W/m2 . (a) Calculate
the total power radiated by the Sun. (b) Determine the maximum values of the electric and magnetic el
Recitation 1
Chapters 12 and 13
Problem 12.1.
Problem 12.7.
Problem 12.20.
Problem 12.31.
Problem 12.33.
Problem 12.38.
Problem 13.16.
Problem 13.18. A series of pulses, each of amplitude 0.150 m, are sent down a string that is attached to a post at one
e
Homework 1
Chapters 12 and 13
Problem 1. A frictionless block-spring system oscillates with amplitude A. If the mass of the block is doubled without
changing the amplitude, (a) does the total energy change? (b) does the frequency of oscillation change?
(a
Homework 2
Chapters 14 and 24
Problem 1. A string with a mass of 5 g and a length of 1 m has one end attached to a wall. 70 cm from the wall, the string
passes over a pully and hangs, supporting a 1 kg mass. (a) What is the fundamental frequency of vibrat