A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is
a. 0.
b. 0.2 m/s2.
c. 4 m/s2.
d. 8 m/s2.
e. 16 m/s2.
d
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A typical meteor is created by a particle about the size of a
A) baseball. B) pea. C) car. D) basketball.
Why are radio waves probably the most efficient way to communicate between civilizations?
A) radio waves are easy to produce and are not affected much by interstellar matter in the galaxy B) radio waves are the most penetrating of all electromagnetic radiations C) all advanced civilizations are certain to use radio waves for communication D) radio waves are the only kind of electromagnetic radiation that can carry information
Calculate the percentage composition by mass (to the nearest 0.1) of each element in sodium sulfide, Na2S
Short-focal-length lenses and mirrors must be strongly curved
a. True b. False Indicate whether the statement is true or false