If the speed of a car is tripled, the impulse required to stop the car changes by a factor of
A. 3.
B. 1/3.
C. 1.
D. 9.
E. 1/9.
Answer: A
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Spicules can trigger communications blackouts and auroras on Earth
a. True b. False Indicate whether the statement is true or false
Which of the following is not considered a potential solution to the question of why we lack any evidence of a galactic civilization?
A) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know. B) There is no galactic civilization because we are the first species ever to achieve the ability to study the universe. C) The galactic civilization is deliberately avoiding contact with us. D) There is no galactic civilization because all civilizations destroy themselves before they achieve the ability to colonize the galaxy.
If you drop a rock from a great height, about how fast will it be falling after 5 seconds, neglecting air resistance?
A) It depends on how heavy it is. B) It depends on what shape it is. C) 10 m/s D) 15 m/s E) 50 m/s
Suppose you are on the moon and you drop a rock and a feather at the same time. You will find that
A) the two fall at the same speed, but this speed is slower than a rock would fall on Earth. B) the rock falls faster than the feather, although both of them fall slower than they would on Earth. C) the rock falls faster than the feather, and both speeds are the same as they would be on Earth. D) the two fall at the same speed, and this speed is the same as the speed of a rock falling on Earth. E) they don't fall--they remain suspended above the surface of the moon.