Cummings,Laws,Redish,Cooney-Understanding Physics (Homework)

Chris Read

Wiley, section 1, Fall 2010

Instructor: Mr. Wiley

Current Score: 0/10

Due: Friday, August 27, 2010 08:00 PM EDT

About this Assignment

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Description

Here are some textbook questions from Understanding Physics 1/e by Cummings, Laws, Redish, and Cooney published by John Wiley & Sons, Inc.

To see a demo of chapter 2 of the online book, click Home and select the Wiley Online Books class from the pulldown menu. If you adopt Cummings et al, your students will see an option to purchase the online book on their WebAssign Homepage.

Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/2 points Notes Question: CLPhys1 1.P.001.
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Speed of Light Express the speed of light, 3.0 108 m/s, in the following units.
(a) inches per nanosecond
Enter a number.
 in./ns
(b) nanometers per millisecond
Enter a number.
 nm/ms


2. –/1 points Notes Question: CLPhys1 2.P.027.
Question part
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Even Faster Electrons An electron with initial velocity v0 = 1.1 105m/s enters a region 1.0 cm long where it is electrically accelerated (Figure 2-26). It emerges with velocity v = 4.20 106 m/s. What was its acceleration, assumed constant? (Such a process occurs in the electron gun in a cathode-ray tube, used in television receivers and oscilloscopes.)
Enter a number.
 m/s2


Figure 2-26



3. –/1 points Notes Question: CLPhys1 4.XP.003.
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Which of the arrangements of axes in Fig 3-23 below can be labeled "right-handed coordinate system"? As usual, each axis label indicates the positive side of the axis. (Select all that apply.)



Figure 3-23



4. –/2 points Notes Question: CLPhys1 12.XP.006.
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A small solid marble of mass m and radius r will roll without slipping along the loop-the-loop track shown in Fig. 12-34 if it is released from rest somewhere on the straight section of track. For the following answers use m for the mass, r for the radius of the marble, R for the radius of the loop-the-loop and g for the acceleration due to gravity.


Figure 12-34

(a) From what minimum height h above the bottom of the track must the marble be released to ensure that it does not leave the track at the top of the loop? (The radius of the loop-the-loop is R. Assume R r.)
Enter a mathematical expression.
Click here to preview your answer.

(b) If the marble is released from height 6R above the bottom of the track, what is the magnitude of the horizontal component of the force acting on it at point Q?

Enter a mathematical expression.
Click here to preview your answer.

Click here for help with symbolic formatting.

5. –/4 points Notes Question: CLPhys1 22.P.030.
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Four Charged Particles Figure 22-28 shows four charged particles that are fixed along an axis, separated by distance d = 2.35 cm. The charges are indicated.


Figure 22-28

(a) Find the magnitude and direction of the net electrostatic force on the particle with charge +2e, due to the other particles.
Enter a number.
 N

(b) Find the magnitude and direction of the net electrostatic force on the particle with charge -e, due to the other particles.
Enter an exact number.
 N
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