If H equals 50 km/s/Mpc, then a galaxy with a radial velocity of 50,000 km/s will have a distance of about 1 Mpc
a. True
b. False
Indicate whether the statement is true or false
False
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A billion solar mass black hole has a radius of only:
A) one solar diameter. B) 20 A.U. C) 400 A.U. D) 3 parsecs. E) 20 parsecs.
One possible feedback effect of global warming that could "run away" unpredictably is
A) warming of the Pacific ocean stops the El Niño phenomenon which leads to further warming of the Pacific. B) warming leading to decreased cloud cover leading to further warming. C) ozone depletion that allows more ultraviolet to strike Earth, leading to further ozone depletion. D) melting Arctic ice leading to increased absorption of radiation leading to further warming.
Consider an AC series circuit containing a coil, capacitor and resistance. Tripling the frequency will change the circuit's impedance by what factor?
a. 1/3 b. 1.0 c. 3 d. Information is insufficient to determine answer.
A spaceship is moving in a straight line away from Earth at 0.80c, measured relative to Earth. It launches a missile that moves away from the spaceship in the forward direction at 0.60c, relative to the ship
Relative to Earth, what is the speed of this missile? A) greater than 0.80c but less than c B) 1.4 c C) c D) greater than c but less than 1.4c