Uniform Circular Motion: A particularly scary roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop is 13.2 m, with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.
A. 11.4 m/s
B. 12.5 m/s
C. 10.1 m/s
D. 14.9 m/s
Answer: A
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Our solar system consists of
A) the Sun and all the objects that orbit it. B) the Sun and the planets, and nothing else. C) a few hundred billion stars, bound together by gravity. D) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars.
A point charge Q1 = +6.0 nC is at the point (0.30 m, 0.00 m); a charge Q2 = -1.0 nC is at (0.00 m, 0.10 m),
and a charge Q3 = +5.0 nC is at (0.00 m, 0.00 m). What are the magnitude and direction of the net force exerted on the +5.0-nC charge by the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
The _____ are the genetic material in a cell
A) chloroplasts B) centrioles C) lysosomes D) chromosomes
Energy Levels: What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 199 nm B. 365 nm C. 4480 nm D. 398 nm E. 796 nm