An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration due to gravity on this planet?

A) 3 m/s2
B) 6 m/s2
C) 12 m/s2
D) 15 m/s2
E) none of the above


Answer: C

Physics & Space Science

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An LR circuit contains an ideal 60-V battery, a 42-H inductor having no resistance, a 24-? resistor, and a switch S, all in series

Initially, the switch is open and has been open for a very long time. At time t = 0 s, the switch is suddenly closed. How long after closing the switch will the potential difference across the inductor be 24 V? A) 1.6 s B) 1.4 s C) 1.8 s D) 1.9 s E) 2.1 s

Physics & Space Science

Silver solder



(a) At what temperature does the first solid form, and what is the chemical composition of this first solid to form?
(b) At what temperature does the alloy completely transform to a solid; what phases are present after the alloy is completely solid, and what are their chemical compositions at the transformation temperature?
(c) At room temperature, what is the atom fraction of each phase present?

Physics & Space Science

If you are in the Moon's umbral shadow, then you are witnessing

A) nighttime. B) some kind of lunar eclipse. C) a total solar eclipse. D) a partial solar eclipse. E) a total lunar eclipse.

Physics & Space Science

The ideal shape for the primary mirror of a telescope is __________

Fill in the blank(s) with correct word

Physics & Space Science