Page 49 - Digital Book Bilingual Perpindahan Kalor
P. 49
l a t i h a
l a t i h a n n
1. Two objects with the same mass are heated for the same amount
of time using the same heat source. Will their temperature
increases always be the same? Explain your answer.
2. A metal spoon and a plastic spoon are placed in hot soup. After a
few minutes, the metal spoon feels hotter. Does this mean the
metal spoon has absorbed more heat? Explain using the concept
of specific heat.
3. A 2.0 kg block of aluminum is heated and absorbs 18 000 J of
heat energy. If the specific heat capacity of aluminum is 900 J
kg⁻¹ °C⁻¹, calculate the temperature change of the block.
4. A cup contains 0.25 kg of water at 25 °C. How much heat energy
is required to raise its temperature to 45 °C?
(c of water = 4186 J kg⁻¹ °C⁻¹)
5. A 1.0 kg iron container (c = 450 J kg⁻¹ °C⁻¹) holds 1.0 kg of water
(c = 4186 J kg⁻¹ °C⁻¹). Both are heated together and their
temperature increases by 30 °C. Calculate the total heat energy
absorbed by the system.
s u b m i t t
s u b m i
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