On Mars, the acceleration due to gravity is 8 m/s/s. If an object is dropped over the surface of Mars, how fast will it be moving at the end of 3 seconds of fall?
A) 32 m/s B) 72 m/s C) 16 m/s D) 24 m/s E) 8 m/s
D
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A 50-N object falling in air experiences 30 N of air resistance. The net force on the falling object is
A) 0 N. B) 20 N. C) 50 N. D) 80 N.
A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10^?8 ? / m. If a potential difference of 0.50 V is placed across the ends of the rod, at what rate is heat generated in the rod?
a. 3.0 W b. 5.3 W c. 8.3 W d. 1.3 W e. 17 W
As an object moves from point A to point B only two forces act on it: one force is nonconservative and does ?30 J of work, the other force is conservative and does +50 J of work. Between A and B,
a. the kinetic energy of object increases, mechanical energy decreases. b. the kinetic energy of object decreases, mechanical energy decreases. c. the kinetic energy of object decreases, mechanical energy increases. d. the kinetic energy of object increases, mechanical energy increases. e. None of the above.
Deuterium is much more abundant on Venus than Earth. What do we think this fact tells us about Venus?
A) that it once had a much stronger magnetic field than it does today B) that the greenhouse effect on Venus must have been much weaker in the distant past C) that it has lost a tremendous amount of water as a result of molecules being split by ultraviolet light and the hydrogen escaping to space D) that volcanoes on Venus did not outgas as much water as volcanoes on Earth