When we say charge is conserved, we mean that charge can

A. be saved, like money in a bank
B. take equivalent forms
C. be created or destroyed, as in nuclear reactions
D. only be transferred from one place to another


Ans: D. only be transferred from one place to another

Physics & Space Science

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64,200,000,000 is equal to

a. 6.42 × 10^7. b. 6.42 × 10^?7. c. 6.42 × 10^10. d. 6.42 × 10^?10. e. 1.0 × 10^64.2.

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Impulse: A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many atoms strike the umbrella each second? Assume that the wind blows horizontally so that the gravity can be neglected.

What will be an ideal response?

Physics & Space Science

When the temperature of ice-cold water is increased slightly, does it undergo a net expansion or a net contraction?

Physics & Space Science

Wind blowing over the top of a hill

A) increases atmospheric pressure there. B) decreases atmospheric pressure there. C) does not affect atmospheric pressure there.

Physics & Space Science