For simplicity, a professor uses 9.8 (meters per second) per second for the acceleration due to gravity instead of the more precise 9.81 (meters per second) per second. If Cavendish had made the same approximation, his estimate for Earth's mass have been
A. too high
B. too low
Ans: B. too low
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What is the second largest ocean on Earth?
a. Atlantic b. Indian c. Antarctic d. Mediterranean e. Pacific
A distant galaxy is emitting light from the helium spectrum at 388.9 nm. On Earth the wavelength of the light from this galaxy is measured to be 540.6 nm
Estimate how far from Earth (in light-years) this galaxy is if the Hubble constant has the value 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
Light is reflecting off a wedge-shaped thin piece of glass producing bright and dark interference fringes. If a certain location has a bright fringe, a nearby point will have a bright fringe if the thickness of the glass increases by:
a. one wavelength of the light. c. 1/8 of a wavelength of the light. b. 1/4 of a wavelength of the light. d. 1/2 of a wavelength of the light.
What is the direction of 
at point O?
A. A B. B C. C D. D E. E F. F T. Zero