A skydiver who weighs 500 N reaches terminal velocity at 90 km/h. The air resistance on the skydiver is
A) 90 N.
B) 250 N.
C) 410 N.
D) 500 N.
E) none of the above
Answer: D
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A group of one hundred to a few thousand stars in a region of 25 pc in diameter that were created at the same time and our bound together by gravity is called a(n) ____
a. associated cluster b. open cluster c. closed cluster d. globular cluster e. nebular cluster
If the distance between us and a star is doubled, with everything else remaining the same, the luminosity
A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four. B) is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. C) remains the same, but the apparent brightness is decreased by a factor of two. D) remains the same, but the apparent brightness is decreased by a factor of four. E) is decreased by a factor of four, but the apparent brightness remains the same.
Charge A and charge B are 3.00 m apart, and charge A is +1.44 C and charge B is +3.10 C. Charge C is located between them at a certain point and the force on charge C is zero. How far from charge A is charge C?
a. 1.78 m b. 2.15 m c. 1.22 m d. 0.465 m e. 2.04 m
Projectile Motion: For general projectile motion with no air resistance, the horizontal component of a projectile's velocity
A. remains zero. B. remains a non-zero constant. C. continuously increases. D. continuously decreases. E. first decreases and then increases.