Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs

A) current.
B) voltage.
C) resistance.


Answer: B

Physics & Space Science

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The first spacecraft to land on the surface of an asteroid was named

A) Dawn. B) NEAR. C) Hayabusa. D) Stardust. E) Giotto.

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The difference between the pressures inside and outside a tire is called

a. absolute pressure b. gauge pressure c. atmospheric pressure d. psi e. none of the above

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The accelerating force of the wind on a small 250-kg sailboat is 707 N northeast. If the drag of the keel is 500 N acting west, what is the acceleration of the boat?

a. 1.5 m/s2 due east c. 3.0 m/s2 northeast b. 2.5 m/s2 due north d. 2.0 m/s2 due north

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Comets are composed of ______________ and ______________

Fill in the blank(s) with correct word

Physics & Space Science