What is the maximum theoretical efficiency possible for an engine operating between 
and 
A. 25%.
B. 45%.
C. 55%.
D. 75%.
B. 45%.
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Nuclei with the highest binding energy per nucleon eb have Z most closely equal to what?
A. 2 B. 4 C. 26 D. 60 E. The highest number possible F. Other (specify)
A 2.0-kg body moving along the x axis has a velocity vx = 5.0 m/s at x = 0. The only force acting on the object is given by Fx = (?4.0x) N, where x is in m. For what value of x will this object first come (momentarily) to rest?
a. 4.2 m b. 3.5 m c. 5.3 m d. 6.4 m e. 5.0 m
A double star system with each star having the mass of the Sun has an orbital period of 1 year. A second double star system, also with each star having the mass of the Sun, has an orbital period of 8 years. If the separation of the stars in the first system is d and the orbits in both cases are circular, what is the separation of the stars in the second system?
a. 0.5d c. 4d b. 2d d. 8d
An auditorium has a volume of 6 × 10^3 m3 . How many molecules of air are needed to fill the auditorium at one atmosphere and 0°C?
a. 1.6 × 10^29 b. 1.6 × 10^27 c. 1.6 × 10^25 d. 1.6 × 10^23 e. 1.6 × 10^20