Knowledge of Earth's interior comes primarily from returning samples of material deep within Earth.
Answer the following statement true (T) or false (F)
False
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Consider the interference colors in a film of gasoline on a wet street. The water provides a
A) means of spreading the gasoline into a thin film. B) means of slowing the rapid evaporation of gasoline. C) chemical bond with the gasoline. D) second reflecting surface. E) all of the above
A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg. The seal grabs onto the whale and holds fast
What is the speed of these two sea creatures just after their collision? You can neglect any drag effects of the water during the collision. A) 0.00 m/s B) 3.0 m/s C) 4.0 m/s D) 5.0 m/s E) 6.0 m/s
Is it possible, according to Einstein's relativity, for a child to be biologically older than his or her parents?
A) Yes, if the parents go on a long and fast trip and return to Earth. B) Yes, if the child goes on a long and fast trip and returns to Earth. C) No, because it is not possible to actually move backward through time. D) No, because the principles of relativity don't have anything to do with actual biological aging. E) No, because the "relativity of time" does not allow the actual order of events in time to be switched around.
A beam of 1012 neutrons/second is incident on an aluminum foil of thickness 10-4 m. The cross section for absorption is 0.23 bn. What is the reaction rate for neutrons being absorbed?
A) 1.4 × 1011/s B) 1.4 × 109/s C) 1.4 × 108/s D) 1.4 × 1010/s E) 1.4 × 1012/s