While the mantles of Jupiter and Saturn are made of liquid metallic hydrogen, the mantles of Uranus and Neptune are chiefly
A) water. B) rock. C) helium. D) methane. E) ammonia.
A
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A 2.0 kg ball is attached to one end of a light rod that is 1.2 m long. The other end of the rod is loosely pinned at a frictionless pivot. The rod is raised until it is vertical, with the ball above the pivot
The rod is released and the ball moves in a vertical circle. The tension in the rod as the ball moves through the bottom of the circle is closest to: A) 20 N B) 40 N C) 60 N D) 80 N E) 100 N
The mass of 12C is 12 u, where 1 u = 1.660559 × 10^-27 kg. This mass is equal to:
a. the mass of the 12C nucleus plus 6 electrons. b. the mass of the 12C nucleus plus 12 electrons. c. the mass of the 12C nucleus. d. the mass of 6 protons and 6 neutrons.
An electrostatic precipitator uses an electric field to remove smoke from the air
a. True b. False Indicate whether the statement is true or false
Which of the following are irregularities in our solar system that must be explainable in models of planetary formation?
A) Venus' low rate of rotation B) Mars' north-south asymmetry C) the tilt of Uranus' rotation axis D) binary Kuiper Belt objects E) All of the above