# P.O.E. Warm-up Quiz #5

5 Questions | Total Attempts: 32

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Sept. 24 - Sept 28

• 1.
A substance with a mass of 10 kg gains 175 kJ of heat when its temperature increases 12°C. What is this substance's specific heat?
• A.

1458.3 J/Kg K

• B.

21,000 J/Kg K

• C.

1574 J/Kg K

• D.

2757 J/Kg K

• 2.
How much energy is needed to heat 2.5 kg of sand, which has a specific heat of 664 J/(kg K) from 30°C to 50°C?
• A.

33.2 kJ

• B.

3.15 kJ

• C.

3320 J

• D.

3.32 J

• 3.
Calculate the voltage difference in a circuit with a resistance of 12 Ω if the current in the circuit is 1.8 A.
• A.

14.4 v

• B.

22.5 v

• C.

21.6 v

• D.

17.2 v

• 4.
What is the current flowing into a microwave oven that requires 750 W of power if the voltage difference is 110 V?
• A.

6.82 A

• B.

82,500 A

• C.

3012.5 A

• D.

2.6 A

• 5.
An appliance with a resistance of 225 Ω is connected to a 120-v power supply.  How much power is suppuiled to the appliance?
• A.

64.0 watts

• B.

27,000 watts

• C.

308.1 Watts

• D.

15.0 watts