Which of the following numbers is the largest?
A) 23.62 × 108
B) 0.36 × 109
C) 4.35 × 1010
D) 0.056 × 1011
C
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A small piece of debris that burns up in the atmosphere is called a
A) meteor B) meteorite C) asteroid D) meteoroid
A spaceship is traveling to the Moon. At what point is there no more gravitational force exerted on it by Earth?
A) when it gets above the atmosphere B) when it is half-way there C) when it is closer to the Moon than it is to Earth D) There is no point where there is no more gravitational force exerted on the spaceship by Earth
A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weight there?
A) zero B) 100 N C) 200 N D) 400 N E) none of the above
Ions trapped in Earth's magnetic field give rise to
a. photosynthesis. b. auroras. c. ultraviolet radiation. d. ozone.