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Giambattista et al - College Physics 1/e (Homework)

James Finch

Physics - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 4/9

Due: Sunday, September 12, 2010 21:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
0/2 0/1 2 1/3 1
Total
4/9

Description

Here are some textbook questions from College Physics by Giambattista, Richardson, and Richardson published by McGraw-Hill. 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. 0/2 points All Submissions Notes Question: GRR1 2.P.025.
Question part
Points
Submissions
1 2
0/1 0/1
2/50 2/50
Total
0/2
 
A brick of mass 3.00 kg is "weighed under water" by hanging it from a spring scale (similar to that shown in the figure below).

(a) If the spring scale reads 13.0 N, what is the upward force of water on the brick?
Enter a number.
Your answer is incorrect. N
(b) What is the reading of the pan scale on which the beaker sits? The weight of the water and the beaker together is 12.0 N.
Enter a number.
Your answer is incorrect. N
[Hint: refer to Example 2.7.]

2. –/1 points Notes Question: GRR1 4.P.050.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
In the physics laboratory, a glider is released from rest on a frictionless air track inclined at an angle similar to the one shown in the figure below. If the glider has gained a speed of 23.0 cm/s in traveling 40.0 cm from the starting point, what was the angle of inclination of the track?
Enter a number.
°



3. 2/2 points All Submissions Notes Question: GRR1 5.P.011.
Question part
Points
Submissions
1 2
1 1
1/50 1/50
Total
2/2
 
The apparatus of the figure below is designed to study insects at an acceleration of magnitude 970 m/s2 (= 99g). The apparatus consists of a 2.0 m rod with insect containers at either end. The rod rotates about an axis perpendicular to the rod and at its center.
(a) How fast does an insect move when it experiences a centripetal acceleration of 970 m/s2?
Enter a number.
Your answer is correct. m/s
(b) What is the angular speed of the insect?
Enter a number.
Your answer is correct. rad/s



4. 1/3 points All Submissions Notes Question: GRR1 6.P.021.
Question part
Points
Submissions
1 2 3
0/1 0/1 1
1/50 0/50 1/50
Total
1/3
 
Justin moves a desk 4.5 m across a level floor by pushing on it with a constant horizontal force of 390 N. (It slides for a negligibly small distance before coming to a stop when the force is removed.) Then, changing his mind, he moves it back to its starting point, again by pushing with a constant force of 390 N.
(a) What is the change in the desk's gravitational potential energy during the round-trip?
Enter an exact number.
Your answer is incorrect. kJ
(b) How much work has Justin done on the desk?
Enter a number.
 kJ
(c) If the work done by Justin is not equal to the change in gravitational potential energy of the desk, then where has the energy gone?


5. 1/1 points All Submissions Notes Question: GRR1 20.TB.001.
Question part
Points
Submissions
1
1
3/50
Total
1/1
 
In the figure below (part b), a metal rod moves to the right at speed v. (a) What is the current in the rod, in terms of v, B, L, and R? (b) In what direction does the current flow? (c) What is the direction of the magnetic force on the rod?
    

Your answer is correct.


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