Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Mort observes
A) the beam moving just 1000 km/s faster than Velma.
B) the beam moving away at 300,000 km/s.
C) Both of the above.
D) the beam moving 300,000 km/s faster than Velma.
E) All of the above.
C
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The fundamental force that is the principal cause of what we experience as frictional forces is:
A. gravitational force B. electromagnetic force C. weak force D. strong force
The photons from the microwave background have not interacted with matter since the universe was how old?
A) 4,000,000,000 years old B) 4,000,000 years old C) 400,000 years old D) 4,000 years old E) 4 seconds old
During the first moments of the big bang when elements could be created, nuclear fusion reactions made few heavy elements because
a. all heavy nuclei are unstable. b. no stable nuclei exist with masses of 5 or 8 hydrogen masses. c. the helium nucleus is unstable. d. the temperature and density were too low. e. no nuclei heavier than helium could form since there weren't any electrons formed.
Boiling is the process of evaporation
A) beneath the water surface. B) at its extreme. C) that cools instead of warms.