A car is initially moving at 20 m/s east, and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?
a. northeast
b. northwest
c. west
d. north of west
d
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Venus has a higher average surface temperature than Mercury. Why?
A) because its surface is heated by an extreme greenhouse effect B) because it is closer to the Sun C) because its surface is covered with hot lava from numerous active volcanoes D) because its slow rotation gives it more time to heat up in sunlight
Why are there no impact craters on the surface of Io?
A) Io is too small to have experienced many impacts. B) Jupiter's strong gravity prevents impacts from hitting Io. C) All of Io's impact craters have been buried by lava flows. D) Any impact craters that once existed on Io were eroded by winds and rain. E) Io formed only recently, long after the heavy bombardment ended.
Based on counting the number of galaxies in a small patch of the sky and multiplying by the number of such patches needed to cover the entire sky, the total number of galaxies in the observable universe is estimated to be approximately
A) 10 billion. B) 100 million. C) 100 billion. D) 1 trillion. E) 1 billion.
If the units of your answer are kg ? m2/s3, which of the following types of quantities could your answer be? (There could be more than one correct choice.)
A) kinetic energy B) force C) power D) work E) potential energy