Two identical sound producers will sound twice as loud as just one
a. True
b. False
Indicate whether the statement is true or false
False
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At an instant when a 4.0-kg object has an acceleration equal to 
m/s2, one of the two forces acting on the object is known to be 
N. Determine the magnitude of the other force acting on the object.
A. 2.0 N B. 13 N C. 18 N D. 1.7 N E. 20 N
Given the thickness and chemical composition of Venus's atmosphere, by how much would you expect its average surface temperature to change between day and night?
a. There should be almost no change in temperature. b. by tens of K (like Earth) c. by hundreds of K (like Mercury) d. The answer depends on where Venus is in its orbit around the Sun.
Which is true about gamma rays?
A) they travel much slower than the speed of light in a vacuum. B) they may be dark matter. C) they have longer wavelengths than optical light. D) they may be dark energy. E) they are extremely high energy radiation.
The planet whose pole was facing the Sun when Voyager 2 approached in 1986 was
A) Uranus. B) Neptune. C) Saturn. D) Jupiter. E) Mars.