Homework 9 Solutions Spring 2010
Required Problems
Chapter 27
6. The magnetic force must be equal in magnitude to the force of gravity on the wire. The maximum magnetic force is applicable since the wire is perpendicular to the magnetic field. The mass of
Homework 10 Solutions Spring 2010
Required Problems
Chapter 28
7. Since the magnetic field from a current carrying wire circles the wire, the individual field at point P from each wire is perpendicular r to the radial line from that wire to point P. We de
Homework 11 Solutions Spring 2010
Required Problems
Chapter 26
44. (a) From Eq. 26-7 the product RC is equal to the time constant. 24.0 10 -6 s =g RC C= = =y1.60 10 -9 F 3 R 15.0 10 (b) Since the battery has an EMF of 24.0 V, if the voltage across the res
Some Review Problems and Solutions
by Joel Zylberberg
Here are some practice thermodynamics problems (and solutions). These are all tricky for one reason or another. So, if you can do all of these with ease, you are doing great! If there are some steps th
Midterm 2 Review (Friday 2-4pm in 248 LeConte)
Anthony Tagliaferro
Problem 1: Electric elds and potentials
Figure 1: For each conguration, nd the potential and electric eld along the z-axis. Each object is centered around the z-axis. a) A ring of charge o
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Prof Liphardt Physics 7B Midterm 2 Sp 2010 Problems 0, 1, and 2
Brian Henning April 13, 2010
Problem 0 - 10 points
Consider the diagram shown. For each option below, state whether it is true or false. There is only one correct option NOTE: I graded the pr
Physics 7B: Saturday Midterm 2 Review Problems
Natania Antler
(Dated: March 30, 2010) The review session will be held on Saturday, April 3rd from 2-4 PM in 155 Dwinelle. Try these problems before coming to the session. I will work through these problems o
Physics 7B: Saturday Midterm 2 Review Solutions
Natania Antler
(Dated: April 3, 2010)
1.
CHARGED SLABS
2d
- +
d d
z
Z=0
FIG. 1: Charged slabs for parts (a) and (b).
Consider charged slabs as shown in Figure 1. (a) Consider a infinite plane slab in the xy
1. a) Define the coefficient of performance for a refrigerator in terms of Q_in, Q_out, and W_net (hint: "what you want"/"what you have to put in") b) Consider the cycle shown (see solutions). How do you know it can be used for refrigeration? Explain how
Physics 7b Midterm 2 Review Saturday, April 4, 2009 1. Use Gauss's law to prove that a point charge q in free space cannot be held in stable equilibrium by electrostatic forces alone. Hint: If a stable equilibrium position existed for q , what would the e
7B MT1 Saturday Review Problems
Patrick Varilly 21 Feb 2008
1
Liphardt, Spring 05, Prob 2
In an experiment liquid helium at an initial temperature of 1.0 K is to be cooled further by bringing it into contact with a solid which is initially at a lower temp
7B MT1 Sunday Review Session Solutions
Patrick Varilly and Steven Byrnes
1
Liphardt, Spring 05, Prob 2
a) Notice that cL and cS are plain heat capacities, not specic (per kg) heat capacities (look at their units). Dene the following quantities. QL TL TL,i
Physics 7B, Spring 2010 Final Exam Review Session (Friday) Peter Battaglino
Problem 1: A magnetohydrodynamic drive, or MHD drive for short, utilizes a strong magnetic field to propel a conducting fluid out of the back of a vehicle. For example, the vehicl
Rough Rubric
Not treating the ice correctly was considered a critical error in Part II.
A misapplication of energy conservation was considered a critical error in the whole problem.
Having the wrong terms in the energy in either part was a fairly large er
Physics 7B, Fall 2009, Sections 2 and 3, Instructor: Professor Adrian Lee Second Midterm Examination, Tuesday November 3, 2009 Please do work in your bluebooks. You may use one double-sided 3.5 x 5 index card of notes. Test duration is 90 minutes.
1) Gian
Fall 2009 - Lee - Midterm 2 solutions
Problem 1 Solutions
Part A Because the middle slab is a conductor, the electric eld inside of the slab must be 0. Parts B and C Recall that to nd the electric eld near a plane charge of charge density , you can draw a
PHYSICS 7b MIDTERM 2 Prof. C. F. McKee Nov 2, 2009
Partial credit will be given, so show your reasoning carefully. The number of points for each problem is listed at the left. You are permitted one 3x5 card of notes, written on both sides. Relevant consta
Fa09-McKee-MT2-sol
Fall 2009 - McKee - Midterm 2 solutions
Problem 1
The only meaningful way to compare the cost of the battery and the wall socket is cost per unit energy. In fact, cost per unit energy is the only information we are given about the expen
Homework 2 Solutions Spring 2010
Required Problems
Chapter 18
48. The mean free path is given by Eq. 18-10b. Combine this with the ideal gas law to find the mean free pathdiameter relationship.
PV = NkT N V d= = P kT ; lM = kT 2 l M P kT 2 l M P = 1 4 2 r
Homework 2 Solutions Spring 2010
Required Problems
Chapter 20
5. The efficiency is the work done by the engine, divided by the heat input to the engine from the burning of the gasoline. Both energy terms are expressed in terms of a rate. The gasoline prov
Homework 4 Solutions Spring 2010
Required Problems
Chapter 21
8. Use the charge per electron and the mass per electron. 1 electron = 2.871 1014 2.9 1014 electrons 46 106 C 19 1.602 10 C
( (
)
2.871 1014 e
9.109 1031 kg 16 ) = 2.6 10 kg 1e
12. Let the
Homework 5 Solutions Spring 2010
Required Problems
Chapter 22
9. The only contributions to the flux are from the faces perpendicular to the electric field. Over rr each of these two surfaces, the magnitude of the field is constant, so the flux is just Eg
Homework 6 Solutions Spring 2010
Required Problems
Chapter 23
3. The kinetic energy gained by the electron is the work done by the electric force. Use Eq. 232b to calculate the potential difference. W 5.25 1016 J Vba = ba = = 3280 V q 1.60 1019 C
(
)
The