A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?
A) It took less time to rise than to fall.
B) To compare rise and fall times we need to know the mass of the ball.
C) It took the same time to rise as it took to fall.
D) It took longer to rise than to fall.
C
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The Hubble time is
a. the time it takes a galaxy moving at 1000 km/s to move 1 Mpc. b. the time it takes the galaxy to double its size. c. the time since recombination occurred. d. the time remaining before the Universe stops expanding and begins to contract. e. an estimate of the age of the Universe based on the Hubble constant.
Eighteen days past new moon, the Moon's phase is waning gibbous
Indicate whether the statement is true or false
A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30° from its initial direction of motion. What is the x component of the velocity of the 1.0-kg object just after the collision?
a. 3.7 m/s b. 3.4 m/s c. 1.5 m/s d. 2.4 m/s e. 4.1 m/s
Suppose Venus rotated as fast as Earth. How would this change its relative levels of volcanism, tectonics, and erosion?
a. All would remain the same—they are independent of rotationz b. All three would be higher. c. All three would be lower. d. Levels of volcanism and tectonics would stay the same, but erosion levels would be higher. e. Levels of volcanism and tectonics would be higher, and erosion levels would stay the same.