Question:

Potential Energy and Heat?

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A mass of 2000 g falls freely to a platform from

an undetermined elevation with respect to

the platform. On striking the plarform, 84.32

cal of heat is generated. Find:

Ex. 1.

1. the elevation in m.

2. the work at which the mass has a velocity of

14 m·s–1.

3. maximum height of the mass.

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1 ANSWERS


  1. 1 cal = 4.19 joules

    m = 2.0 kg

    h = ?

    E = 84.32 cal * 4.19 J/cal = 353.3 J

    g = 9.81 m/s^2

    PE = mgh

    PE = E (Potential energy is converted to thermal energy only)

    353.3 J = 2.0kg x 9.81 m/s^2 x h

    1)  h = 18.0 m

    2)  When does the mass have a velocity? At the very bottom? At the top?

    3)  Maximum height??

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