A soda-lime
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If you observe a variable star with a period of 50 days as a yellow, supergiant star, then you most likely have seen a(n) ____
a. degenerate star b. RR Lyrae variable star c. eclipsing binary star d. Cepheid variable star e. Type I Pulsar
Occupants of the International Space Station experience weightlessness due to
A) the absence of Earth gravity at that altitude. B) the absence of a support force. C) rotation of the station. D) no inertia in space.
Stars are continually forming in the halo of our Galaxy today
Indicate whether the statement is true or false
A person has a near point of 40 cm and a far point of 1.0 m. When looking through lenses of focal length –1.0 m, what is the nearest an object can be to be seen clearly?
a. 29 cm b. 67 cm c. 134 cm d. 140 cm e. 68 cm