How many molecules are there in 14 grams of nitrogen gas?
a. NA/2
c. 2 NA
b. NA
d. The answer is not given.
A
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In free space, electromagnetic waves travel at a
A) variety of speeds. B) single speed. C) speed depending on frequency.
If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration of objects due to the gravitational attraction on that planet?
A) 70.4 m/s2 B) 51.4 m/s2 C) 61.2 m/s2 D) 81.0 m/s2
Why are ores so valuable?
A) They are sources of naturally occurring gold. B) Metals can be efficiently extracted from them. C) They tend to occur in scenic mountainous regions. D) They hold many clues to Earth's natural history.
Circular Motion of Charges: A charged particle of mass 0.0040 kg is subjected to a 4.0-T magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius 0.10 m at a speed of 2.0 m/s, what is the magnitude of the charge on the particle?
A. 0.020 C B. 50 C C. 0.00040 C D. 2500 C