The runaway greenhouse effect on Venus is most directly responsible for which planetary characteristic?
A. Venus's polar vortex
B. the planet's retrograde rotation
C. the absence of water on Venus
D. the absence of a planetary magnetic field at Venus
Answer: C
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Two lenses, the first with focal length -12.5 cm and the second with focal length 20.0 cm, are separated by 15.0 cm. If an object is place 50.0 cm in front of the first lens, where is the final image formed?
A. 10.0 cm before the first lens B. 25.0 cm before the second lens C. 25.0 cm after the second lens D. 50.0 cm after the second lens E. 100 cm after the second lens
An adiabatic process for an ideal gas is represented on a p-V diagram by:
A. a horizontal line B. a vertical line C. a hyperbola D. a circle E. none of these
A string is wrapped around a pulley with a radius of 2.0 cm and no appreciable friction in its axle. The pulley is initially not turning
A constant force of 50 N is applied to the string, which does not slip, causing the pulley to rotate and the string to unwind. If the string unwinds 1.2 m in 4.9 s, what is the moment of inertia of the pulley? A) 0.17 kg?m2 B) 17 kg?m2 C) 14 kg?m2 D) 0.20 kg?m2 E) 0.017 kg?m2
What evidence leads scientists to conclude that life was present on Earth within a billion years of its formation?
A) Such early existence of life is the only way to explain the variety of life-forms seen today. B) Fossil evidence of life dates back to this time. C) Studies of DNA indicate that life must have been present by that time.