An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1.20 kJ of heat from the hot reservoir and produces 0.450 kJ of work. How much entropy is created in the process?
A) 0 J/K B) 0.44 J/K C) 0.73 J/K D) 0.32 J/K E) 0.68 J/K
D
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Which terrestrial world has the most atmosphere?
A) Venus B) Earth C) Mars D) Mercury.
An observer traveling with speed 0.5c moves directly toward a beacon emitting photons with speed c in her direction. The observer measure the speed approaching photons to be
(a) 0.25c (b) 0.5c (c) c (d) 1.5c
In simple harmonic motion, the acceleration is proportional to
A) the velocity. B) the frequency. C) the amplitude. D) the displacement. E) all of the above
A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point. Assume no air. What was the angle of launch if g = 9.80 m/s2?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°