A Level Multiple Choice

Specific Heat Capacity Questions

Q1. A continuous stream of water falls through a vertical distance of 100 m.

Assume no thermal energy is transferred to the surroundings.

The specific heat capacity of water is 4200 J kg−1 K−1 .

What is the temperature difference of the water between the top and bottom of the waterfall?

A
0.023 K
B
0.23 K
C
2.3 K
D
4.3 K

 

Q2. Axel measures the power of a microwave oven.

He places 200 g of water at 23 °C into the microwave and heats it on full power for 1 minute.

When he removes it, the temperature of the water is 79 °C.

The specific heat capacity of water is 4200 J kg−1 K−1 .

What is the average rate at which thermal energy is gained by the water?

A
780 W
B
840 W
C
1.1 kW
D
4.6 kW