When Paul compresses air with a tire pump, the temperature of the compressed air
A) drops.
B) remains unchanged.
C) increases as work is done on it.
D) none of the above
Answer: C
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A thermodynamic engine having the maximum possible efficiency has an efficiency of 35.0% when operating between two heat reservoirs. If the temperature of the hot reservoir is 700 K, what is the temperature of the cold reservoir?
A) 200 K B) 245 K C) 350 K D) 455 K E) 600 K
A jet plane flying 600 m/s experiences an acceleration of 4.0 g when pulling out of the circular section of a dive. What is the radius of curvature of this section of the dive?
A) 1.2 km B) 5.8 km C) 0.64 km D) 9.2 km E) 7.0 km
An electron has a speed of 0.643c. Through what potential difference would the electron need to be accelerated (starting from rest) in order to reach this speed? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 160 kV B) 200 kV C) 130 kV D) 180 kV
Two organ pipes, a pipe of fundamental frequency 440 Hz, closed at one end, and a pipe of fundamental frequency 660 Hz, open at both ends, produce overtones. Which choice below correctly describes overtones present in both pipes?
a. After the first overtone of each pipe, every second overtone of the first pipe matches every second overtone of the second pipe. b. After the first overtone of each pipe, every second overtone of the first pipe matches every third overtone of the second pipe. c. After the first overtone of each pipe, every third overtone of the first pipe matches every second overtone of the second pipe. d. After the first overtone of each pipe, every second overtone of the first pipe matches every fourth overtone of the second pipe. e. After the first overtone of each pipe, every third overtone of the first pipe matches every fourth overtone of the second pipe.