than to lift it straight up. ROPE CLIMBING (2011;3 – AS90940) A girl of mass 60 kg uses 5 100 J of energy when she climbs a vertic

Question

than to lift it straight up.
ROPE CLIMBING (2011;3 – AS90940)
A girl of mass 60 kg uses 5 100 J of energy when she climbs a vertical rope.
(a)
Calculate the maximum height it would be possible for the girl to reach.
(b)
In reality, the girl reaches a height of only 8 m.
Explain why the energy used by the girl during the climb does not equal the
work she does to reach the vertical height of 8 m.
In your answer you should:
name the type of energy the girl has when she is 8 m above the ground
calculate the work done to reach a height of 8 m above the ground
calculate the difference between the work done and the energy used by the
girl
•
explain where the “missing” energy has gone, and why this occurs.​

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King 5 years 2021-08-23T12:20:25+00:00 1 Answers 5 views 0

Answers ( )

  1. linhdan
    0
    2021-08-23T12:22:06+00:00
    Reply

    Explanation:

    (a) PE = mgh

    5100 J = (60 kg) (10 m/s²) h

    h = 8.5 m

    (b) At 8 m, the girl has a gravitational potential energy of:

    PE = mgh

    PE = (60 kg) (10 m/s²) (8 m)

    PE = 4800 J

    The difference in energy is 300 J.  This energy is converted into heat in the girl’s muscles.

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