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    mashonga81's Avatar
    mashonga81 Posts: 1, Reputation: 1
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    #1

    Sep 15, 2009, 10:14 AM
    Energy, Work and Power
    caculate the number of revolutions of the shaft required to raise a load through 1.2m.
    Diameter of the shaft=10.0m
    mass of the load=0.5kg
    time taken to raise the load through 1.2m=5.0s
    assuming that the thickness of the thread can be ignored and that the gravitational force acting on a mass of 1kg is 10.0N.

    (2)the speed of rotation of the output shaft in revolutions per second.
    Clough's Avatar
    Clough Posts: 26,677, Reputation: 1649
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    #2

    Sep 15, 2009, 12:36 PM
    Greetings and WELCOME to the site, mashonga81!

    I moved your question out of Introductions to this forum topic area so that it will be more likely to be noticed and addressed by those who are best able to answer it. Your question will get noticed much more here.

    Introductions is for people to introduce themselves only, and we try to not ask questions there. We would appreciate it if you would return to Introductions sometime to tell us a little bit about yourself, if you would be willing to do that.

    Also, concerning your question - This isn't a site where people simply "plug" in their homework questions and get automatic answers. If that happened, how would that be helping the students to learn how to come up the correct answers on their own?

    What I would suggest that you do, is to show on this thread how you're trying to solve the questions. If you do that, you'll be more likely to have someone come along who'll be able to help you to figure out how to come up with the correct answers on your own.

    I also want to refer you to the announcement about getting homework help on this site, that can be found via clicking on the following link.

    Ask Me Help Desk - Announcements in Forum : Homework Help

    Thanks!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Sep 16, 2009, 09:28 AM
    Quote Originally Posted by mashonga81 View Post
    caculate the number of revolutions of the shaft required to raise a load through 1.2m.
    Diameter of the shaft=10.0m
    mass of the load=0.5kg
    time taken to raise the load through 1.2m=5.0s
    assuming that the thickness of the thread can be ignored and that the gravitational force acting on a mass of 1kg is 10.0N.

    (2)the speed of rotation of the output shaft in revolutions per second.
    1. Find the circumference of the shaft. One revolution moves the load along the circumference of the shaft. You can find the number of revolutions easily.

    2. You have the number of revolutions now. That is done in 5 seconds. You can easily find the speed of rotation of the shaft now.
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