If the Sun collapsed to a black hole, Earth would
A) be sucked into the black hole.
B) follow a straight-line path into space.
C) continue in its present orbit.
Answer: C
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While yet unseen, some gravitational evidence suggests the existence of dark galaxies
Indicate whether the statement is true or false
If the density of the universe is lower than the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe. B) the universe is expanding at a rate less than the escape speed of the universe. C) the universe is expanding at a rate greater than the escape speed of the universe. D) the universe is expanding at a rate equal to the speed of light. E) the universe is expanding at a rate greater than the speed of light.
Series/Parallel Circuits: Two resistors with resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination. What is the current through (a) the 4.0-? resistor and (b) the 5.0-? resistor?
What will be an ideal response?
Which fact about Mars is true?
A. There are no volcanoes on Mars. B. No spacecraft has ever landed on Mars. C. There was never water on the surface of Mars. D. It is always warmer than freezing on Mars surface. E. Mars has a thinner atmosphere than Earth does.