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CPO - Hsu - Physics: A First Course 1/e (Homework)

James Finch

Physics - High School, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 1/9

Due: Tuesday, August 17, 2010 19:00 EDT

About this Assignment

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

Description

Here are some textbook questions from Physics: A First Course 1/e by Tom Hsu and published by CPO Science. Click here for a list of all of the questions coded in WebAssign.

All the questions below are from the end of chapter 4.

Question 1 is one of the Understanding Vocabulary questions.

Question 2 is a Reviewing Concept question in a multiple answer format.

Question 3 is an Problem with 2 numerical parts.

Question 4 is a Problem with a numerical part followed by a multiple choice.

Question 5 is a Applying Your Knowledge question with several multiple choice parts with pulldown menus and an essay.


Instructions

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



1. 1/1 points All Submissions Notes Question: CPO-PFC1 4.UV.12.
Question part
Points
Submissions
1
1
1/50
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1/1
 
The pulling force in a rope is known as Your answer is correct.

2. 0/1 points All Submissions Notes Question: CPO-PFC1 4.RC.07.
Question part
Points
Submissions
1
0/1
4/50
Total
0/1
 
Select all the simple machines.

Your answer is incorrect.




3. –/2 points Notes Question: CPO-PFC1 4.P.04.
Question part
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Submissions
1 2
0/1 0/1
0/50 0/50
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0/2
 
You lift a 194 N package to a height of 3.2 meters in 8.6 seconds.
(a) How much work did you do?
Enter a number.
 joules
(b) What was your power?
Enter a number.
 watts


4. –/2 points Notes Question: CPO-PFC1 4.P.18.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
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0/2
 
A 50 watt light bulb uses 50 joules of electrical energy every second. However, only 6.3 joules of electrical energy is converted into light energy each second.
(a) What is the efficiency of the light bulb? Give your answer as a percentage.
Enter a number.
%
(b) What do you think happens to the "lost" energy?
    



5. –/3 points Notes Question: CPO-PFC1 4.AYK.05.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
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0/3
 
A perpetual motion machine is a machine that, once given energy, transforms the energy from one form to another and back again without ever stopping. You have probably seen a Newton's cradle like the one shown below.
(a) Is a Newton's cradle a perpetual motion machine?

(b) According to the laws of physics, is it possible to build a perpetual motion machine?

(c) Many people have claimed to have built perpetual motion machines in the past. Use the internet to find one such machine. Explain how it is supposed to work and why it is not truly a perpetual motion machine.
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