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    Luther2345's Avatar
    Luther2345 Posts: 2, Reputation: 1
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    #1

    Jan 9, 2012, 07:24 PM
    need help with physics 11 work. Please help.
    1. An industrial beam is bent 135.2m by an applied force of 1.75 x 10^3n
    a) Find the beam's spring constant.
    b) calculate the beam's elastic potential energy.
    2. How long would it take a person to hear their echo from a cliff 193m away if the air temperature was 16.7 c?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jan 9, 2012, 11:10 PM
    1.a) Use F = ke?
    b) Use ?

    2. Find the speed of sound in air at such a temperature then use d = st?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Jan 10, 2012, 07:42 AM
    Quote Originally Posted by Unknown008 View Post
    1.a) Use F = ke?
    Right, where e = the beam's deflection.

    Quote Originally Posted by Unknown008 View Post
    b) Use ?
    Not quite. Use . Recall that the units for energy is N-m.

    Quote Originally Posted by Unknown008 View Post
    2. Find the speed of sound in air at such a temperature then use d = st?
    Agreed.
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    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Jan 12, 2012, 06:11 AM
    Oops, I meant to type k... otherwise, it'd be Fe/2. :o
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