A 500-N tightrope walker stands at the center of the rope. If the rope can withstand a tension of 1 800 N without breaking, what is the minimum angle the rope can make with the horizontal?
a. 82°
b. 8.0°
c. 16°
d. 0.40°
e. 7.2°
b
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Measured densities of extrasolar planets range from ________
A) water to iron B) styrofoam to iron C) styrofoam to water
The Bohr theory does not predict that
a. hydrogen atoms will give off the lines from the Balmer series. b. the ground state of hydrogen is spherically symmetric. c. it requires 13.6 eV to ionize hydrogen. d. the approximate radius of a hydrogen atom is 5.3 × 10^?11 m.
If you see a bright "star" in the sky, how could you tell whether it is a star or a planet?
A. Look at it several days later-if it's a planet, it will move across the background stars. B. Planets are round; stars have five points. C. Planets are too dim to be seen without a telescope. D. Planets always appear right next to the Moon.
The thermosphere is warm because it
A) absorbs X-rays. B) absorbs infrared light. C) absorbs visible light. D) contains greenhouse gases. E) absorbs ultraviolet light.