You have taken a picture of a galaxy 1 billion light years away. That picture shows
A) a galaxy that is 1 billion years old. B) a galaxy that is 1 billion light years old.
C) a galaxy that is 13 billion years old. D) a galaxy as it was 1 billion years ago.
D
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In 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter. Assume that these fragments came from an infinite distance away with zero initial speed and fell into Jupiter
What was their speed when they arrived at Jupiter's surface? Jupiter has a mass of 1.90 × 1027 kg and a radius of 71.4 × 106 m, and G = 6.67 x 10-11 N•m2/kg2. A) 10,400 m/s B) 11,200 m/s C) 35,500 m/s D) 42,100 m/s E) 59,600 m/s
A steel ball sinks in water but floats in a pool of mercury, which is much denser than water. Where is the buoyant force on the ball greater?
A) It is the same in both cases. B) submerged in the water C) floating on the mercury D) It cannot be determined from the information given.
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
a. is independent of velocity or acceleration. b. increases when the velocity increases. c. is proportional to the acceleration. d. decreases when the force parallel to the floor increases. e. increases when the force parallel to the floor increases.
To date the age of Earth, we look for rocks with a high percentage of
A) uranium-235 to lead-207. B) uranium-238 to lead-206. C) potassium-40 to argon-40.