If container a has 1000 g of water and the temp. is 25 degrees celsius, then container b has 500 g of water and is 50 degrees celsius, which has more thermal energy and why?
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Answer:
Calculate the change in gravitational potential energy as the truck goes downhill Mgh = (10,000 kg)(9.80 m/s2)(75.0 m) = 7.35 × 106 J.
Calculate the temperature from the heat transferred using Q = Mgh and
Δ
T
=
Q
m
c
, where m is the mass of the brake material. Insert the values m = 100 kg and c = 800 J/kg ⋅ ºC to find
Δ
T
=
(
7.35
×
10
6
J
)
(
100
kg
)
(
800
J/kg
∘
C
)
=
92
∘
C