An ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. After five minutes, the ice cube is melted and the cold drink is two degrees warmer, but the temperature of the swimming pool remains unchanged. What is the best explanation for these
observations?
A. The ice cube has a higher heat capacity than the glass of water and the pool.
B. The ice cube has a lower heat capacity than the glass of water and the pool.
C. The ice cube and the glass of water have higher heat capacities than the swimming pool.
D. The ice cube and the glass of water have lower heat capacities than the swimming pool.

D

Explanation:

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C. the ice cube and the glass of water have higher heat capacity than the swimming pool

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied