Experiments allow physicists today to reproduce (on very small scales) energy and temperature conditions thought to have prevailed in the early universe as far back in time as about
A) one ten-billionth (10-10) of a second after the Big Bang.
B) 380,000 years after the Big Bang.
C) 10-45 seconds after the Big Bang.
D) 10 billion years ago.
A) one ten-billionth (10-10) of a second after the Big Bang.
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What is true of Mars?
A) Its atmosphere is mostly water vapor. B) Definite microfossils have been found. C) Its magnetic field is stronger than Earth's. D) Iron oxide on the surface is responsible for its reddish color. E) A pool of water was discovered by the Mars Rover.
A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker, what total work is done on the wheelbarrow?
a. 240 J c. 144 J b. 216 J d. 96 J
What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the Sun?
a. Magnetic and electric fields heat the planet. b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source. c. The planets are still radiating heat from when they first formed. d. Friction between the planet and its moons heat the planet.
The Earth's core has a density of _____
A) 5.5 g/cm3 B) 10.5 g/cm3 C) 14 g/cm3 D) 18.5 g/cm3