When is an elevator a reasonably good inertial reference frame?
A. Never, under any circumstances.
B. Always, since it is attached to the surface of the earth.
C. It is good except when it is changing speed.
D. Other conditions (describe).
C. It is good except when it is changing speed.
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A machine that promises more energy output than input is
A) a fantasy. B) commonplace in today's technology. C) a long-shot worth investing in.
On average, the stars in elliptical galaxies are older than the stars in spiral galaxies
Indicate whether the statement is true or false
An iron robot falls from rest at a great height. Neglecting air resistance, what is its speed after it has fallen for 3.5 seconds?
A. 34.3 m/s B. 9.8 m/s C. 13.3 m/s D. 9.8 m/s2
How many valence electrons does an atom of phosphorus have?
a. 15 b. 5 c. zero d. 3