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

James Finch

Physics - High School, section 001, Fall 2019

Instructor: Dr. Friendly

Current Score : 9 / 9

Due : Saturday, August 17, 2019 19:00 EDT

Last Saved : n/a Saving...  ()

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Question
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9/9 (100.0%)

  • Instructions

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

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. –/1 points CPO-PFC1 4.UV.12. My Notes
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The pulling force in a rope is known as (No Response) seenKey

tension.
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2. –/1 points CPO-PFC1 4.RC.07. My Notes
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Select all the simple machines.

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3. –/2 points CPO-PFC1 4.P.04. My Notes
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You lift a 194 N package to a height of 3.2 meters in 8.6 seconds.
(a) How much work did you do?
(No Response) seenKey

621

 joules
(b) What was your power?
(No Response) seenKey

72.2

 watts
Your work in question(s) will also be submitted or saved.
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4. –/2 points CPO-PFC1 4.P.18. My Notes
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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.
(No Response) seenKey

12.6

 % (b) What do you think happens to the "lost" energy?
    
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5. –/3 points CPO-PFC1 4.AYK.05. My Notes
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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?
(No Response) seenKey

No, Newton's cradle is not a perpetual motion machine.
(b) According to the laws of physics, is it possible to build a perpetual motion machine?
(No Response) seenKey

No, it is not 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.
(No Response)
Key: Answers will vary.

This answer has not been graded yet.

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