In mechanical systems, power, the rate of doing work, can be computed （） the product of force × velocity.
A.as
B.by
C.into
D.on
正确答案：as
In mechanical systems, power, the rate of doing work, can be computed （） the product of force × velocity.
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Newton’s first law, the law of inertia, （） that it takes a force to change the motion of an object.
A rocket traveling away from Earth （） a speed greater than 11.186 kilometers per second（6.95 miles per second）or 40,270 kilomete
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