When we say work is done by a force, we mean the force does

a. all the work. b. positive work.
c. negative work. d. zero work.


b

Physics & Space Science

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Rilles on the lunar surface were formed by ________.

A. ancient lava flows B. the flow of ancient rivers C. ancient volcano chains D. the impact of small asteroids

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What is the ionization energy of the neutral hydrogen atom?

A) 27.2 eV B) 13.6 eV C) 6.8 eV D) none of the given answers

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A 2.0 ?F capacitor is charged to 12. V and then discharged through 4 × 106 ?. How long will it take for the voltage across the capacitor to drop to 3.0 V?

What will be an ideal response?

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Which is the earliest stage of a star?

A) Helium collects within the core. B) Carbon collects within the core. C) The surface of the star expands into a red giant. D) The star contracts into a blue giant.

Physics & Space Science