When spiral nebulae were first discovered, astronomers quickly identified them as distant groupings of stars
a. True
b. False
Indicate whether the statement is true or false
False
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What is the lifetime of a 10 solar mass star on the main sequence?
a. 3.2 x 107 years b. 320 years c. 3.2 x 1012 years d. 1 x 109 years e. 1 x 1011 years
Two taut strings of identical mass and length are stretched with their ends fixed, but the tension in one string is 1.10 times greater than in the other
Waves on the string with the lower tension propagate at 35.2 m/s. The fundamental frequency of that string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 11.0 Hz B) 9.00 Hz C) 13.7 Hz D) 12.6 Hz E) 17.1 Hz
Heating the air in a hot air balloon reduces the air's _________
Fill in the blank(s) with correct word
Earth releases the energy it receives from the Sun by emitting _________ radiation.
a. infrared b. visible c. ultraviolet (UV) d. radio e. microwave