The element helium was discovered by studying the Sun's spectrum
a. True
b. False
Indicate whether the statement is true or false
True
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The lunar _______________ are saturated with craters
Fill in the blank(s) with correct word
While spinning down from 500.0 rpm to rest, a solid uniform flywheel does of work. If the radius of the disk is what is its mass?
A) 5.2 kg B) 4.4 kg C) 6.0 kg D) 6.8 kg
The vast majority of stars in a newly formed star cluster are ________
A) red giants B) very high-mass, type O and B stars C) less massive than the Sun D) about the same mass as our Sun
A train station bell gives off a fundamental tone of 500 Hz as the train approaches the station at a speed of 30.0 m/s. If the speed of sound in air is 339 m/s, what will be the apparent frequency of the bell to an observer riding the train?
a. 456 Hz b. 544 Hz c. 250 Hz d. 530 Hz e. 339 Hz