Velocity: A light-year is the distance that light travels in one year. The speed of light is 3.00 × 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365 d)
A. 9.46 × 1012 mi
B. 9.46 × 1015 mi
C. 5.88 × 1012 mi
D. 5.88 × 1015 mi
Answer: C
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Two point charges of + 30.0 ?C and - 9.00 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
A) 0.453 N directed towards the negative charge B) 2.45 N directed towards the negative charge C) 2.45 N directed towards the positive charge D) 245 N directed towards the positive charge E) 245 N directed towards the negative charge
What is the minimum x-ray wavelength produced when electrons are accelerated through a potential of 46,800 V? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 eV = 1.60 × 10^?19 J)
a. 4.25E–11 m b. 8.85E–12 m c. 4.01E–12 m d. 2.66E–11 m e. 6.80E–11 m
A bucket of water with total mass 23 kg is attached to a rope, which in turn, is wound around a 0.080-m radius cylinder at the top of a well. A crank with a turning radius of 0.25 m is attached to the end of the cylinder. What minimum force directed perpendicular to the crank handle is required to just raise the bucket? (Assume the rope's mass is negligible, that the cylinder turns on
frictionless bearings, and that g = 9.8 m/s2.) a. 45 N c. 72 N b. 68 N d. 135 N
If the atmosphere’s “optical thickness” n depended on the ratio of the concentrations to the first power instead of to the 1/2 power in equation T10.8a, would this accelerate or brake the warming compared to the model in the text?
A. Accelerate B. Brake C. No change