The magnitude of the drag force of air resistance on a certain 20.0-kg object is proportional to its speed. If the object has a terminal speed 80.0 m/s, what is the magnitude of the drag force on the object when it is falling with a speed 30
0 m/s?
A) 73.5 N B) 15.0 N C) 7.50 N D) 42.7 N E) 196 N
A
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Friction: A horizontal 52-N force is needed to slide a 50-kg box across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?
A. 0.11 B. 0.09 C. 0.10 D. 0.13
Compounds containing only carbon and hydrogen are known as ______________
Fill in the blank(s) with correct word
Astronomers have begun to build instruments to detect "cosmic messengers" that are not forms of light, such as neutrinos, cosmic rays, and gravitational waves, because they
A) provide information about distant objects that we cannot obtain from light. B) provide higher angular resolution than we can obtain with light. C) are unaffected by the turbulence of Earth's atmosphere. D) can allow us to see beyond the horizon of the observable universe.
Which of these strongly relate to a piano string?
A) mass B) length C) pitch D) all of the above E) none of the above