Waves Practice Problem Set Worksheet Page 34
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ECHANICS
RACTICE
ROBLEM
ETS
7.
(G14.3) To what temperature will 7700 J of work raise 3.0 kg of water initially at
10.0°C?
Answer: 10.6°C
8.
(G14.8) How many kilocalories of heat are generated when the brakes are used to
bring a 1000-kg car to rest from a speed of 100 km/hr? Answer: 92 kilocalories
9.
(G14.9) What is the specific heat of a metal substance if 135 kJ of heat is needed to
3
raise 5.1 kg of the metal from 20°C to 30°C?
Answer: 2.6 x 10
J/kg°C
10.
(G14.15) A 1.20 kg head of a hammer has a speed of 8.0 m/s just before it strikes a
nail and is brought to rest. Estimate the temperature rise of a 14-g nail generated by
ten such hammer blows done in quick succession. Assume the nail absorbs all the
energy.
Answer: 61°C
Gamzon & Gregorian-Michaelsen
6/7/16
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