If we went back in time 10 billion years, would we expect Hubble's constant to be identical to the present-day Hubble constant?
A) Yes, a constant never changes.
B) No, Hubble's constant is roughly equal to 1 divided by the age of the universe, and 10 billion is a substantial enough number to notice a difference.
C) If we went back further in time, it would be different, but 10 billion years is not enough.
D) It would only change if we went 10 billion years into the future.
B
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As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in
A) volume. B) density. C) weight. D) mass. E) none of the above
Kepler's Third Law of planetary motion states that
A) the further a planet is from the Sun, the faster it moves in its orbit B) an imaginary line joining the Sun and planet sweeps out equal areas in equal times C) the further a planet is from the Sun, the slower it moves in its orbit D) the orbits of planets are ellipses
Is it possible for an object to accelerate but without changing its speed?
A) Yes, for example when a car is halfway up a straight hill [a hill whose slope, or angle with the horizontal, does not change] and moving a an unchanging speed. B) Yes, for example when a car turns a corner while maintaining an unchanging speed. C) Both of the above. D) No, because the word "acceleration" means "a change in speed." E) No, because the word "acceleration" means "speeding up."
When two identical waves arrive at the same place in phase, there is destructive interference
a. True b. False Indicate whether the statement is true or false