Without the greenhouse effect, the oceans on the Earth's surface would
A) have evaporated
B) be much the same as they are today
C) have covered the entire surface of the Earth
D) be frozen
D
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If the scalar (dot) product of two vectors is negative, it means that
a. there was a calculator error. b. the angle between the vectors is less than 90 degrees. c. the angle between the vectors is 90 degrees. d. the angle between the vectors is greater than 270 degrees. e. the angle between the vectors is between 90 and 180 degrees.
The radius of the Earth is r. A satellite of mass 100 kg is at a point 3r above the Earth's surface. What is the satellites' weight?
A. 6.3 N B. 110 N C. 61 N D. 38 N
The radiation source closest to us originates in
A) medical treatments. B) all kinds of power plants. C) our own bodies. D) none of the above
A 300-A•h battery can deliver how many coulombs starting from a full charge?
a. 4.8 × 10^3 c. 7.2 × 10^5 b. 4.3 × 10^4 d. 1.1 × 10^6