A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ
b. -0.29 kJ
c. +30 J
d. -30 J
e. -50 J
B
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Which of the following does not have a major effect in shaping planetary surfaces?
A) impact cratering B) volcanism C) tectonics D) erosion E) magnetism
A barge is 10.0 m wide and 60.0 m long and has vertical sides. The bottom of the hull is 1.20 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water?
A) 3.53 MN B) 6.39 MN C) 6.82 MN D) 7.06 MN E) 9.54 MN
Extra mass dumped on a white dwarf creates a nova, but if dumped on a neutron star, it creates
A) a millisencond pulsar. B) an X-rays burster. C) a black hole. D) a gamma-ray burster. E) a pulsar.
At what distance could one theoretically distinguish two automobile headlights separated by 1.5 meters? Assume a pupil diameter of 0.50 cm and yellow headlights seen at the wavelength 5.0 × 10^?7 m. Assume eye fluid has an average n = 1.33
a. 6.0 km b. 12 km c. 9.0 km d. 3.0 km e. 16 km