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A copper ball that is 1.5 m in diameter has a temperature of 100C. The environment is at 0C. If the emissivity of copper is 0.15 how much power is radiated by the copper ball?

(A) 6 w

(B) 5,264 W

(C) 500 W

(D) 1,164 W

The Correct Answer
Explanation

What is the natural frequency of a body that has a period of oscillation of 2.7 seconds?

(A) 2.7 s (B) 0.75 s (C) 2.33 s (D) 4.65 s

Correct Answer: C

An iron sphere with a mass of 1.5 kg hangs from a 15 cm long spring. If the spring constant is 0.75 N/m what is the period of oscillation when the sphere is pulled down and released?

(A) 3.2 s (B) 8.9 s (C) 4.4 s (D) 12.5 s

Correct Answer: B

What is the thermal efficiency for a Carnot engine that operates between 100F and 400K?

(A) 75% (B) 77.5% (C) 7.8% (D) 22.3%

Correct Answer: D

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