Which of the following could not be determined by an observation that only uses spectroscopy?
A) the chemical composition of a distant star
B) the speed at which a distant galaxy is moving away from us
C) the surface temperature of a distant star
D) the rotation rate of a distant star
E) the angular size of a distant galaxy
E) the angular size of a distant galaxy
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__________is the hazy band of light that circles our sky, produced by the glow of our Galaxy
A) Messier 83 B) Cosmos Redshift 7 C) The Milky Way D) The Pinwheel
A _________ wave is one with its oscillations perpendicular to the direction of propagation
Fill in the blank(s) with correct word
Two children seat themselves on a seesaw. The one on the left has a weight of 300 N while the one on the right weighs 200 N. The fulcrum is at the midpoint of the seesaw. If the child on the right is not at the end but is 1.50 m from the fulcrum and the seesaw is balanced, what is the torque provided by the weight of the child on the left? (Take ccw as positive.)
a. –300 N·m b. 300 N·m c. 450 N·m d. –450 N·m e. 150 N·m
Two unknown resistors A and B are connected together. When they are connected in series their combined resistance is 15 ?. When they are connected in parallel, their combined resistance is 3.3 ?. What are the resistances of A and B?
A) 15 ? and 5 ? B) 5 ? and 10 ? C) 2.5 ? and 5 ? D) 32? and 20 ? E) 10 ? and 30?