Ground-based observations can be made easily in the ________ part(s) of the spectrum.
A. ultraviolet and visible
B. infrared
C. radio and ultraviolet
D. radio and visible
Answer: D
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Velocity Selector: In a velocity selector consisting of perpendicular electric and magnetic fields, the speeds of the charged particles passing through the selector are increased or decreased until they are equal to the desired speed.
A. True B. False
A frictionless simple pendulum, with a small but dense 4.4-kg bob at the end and a length of 75 cm, is released from rest at an angle of 50° with the vertical
(a) To what height above its lowest point does the bob swing on the other side? (b) What is the speed of the bob at the bottom of the swing?
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A) 46 N B) 37 N C) 52 N D) 56 N
__________is one of the small bodies that formed from the solar nebula and eventually grew into protoplanets
A) A planetesimal B) The Oort cloud C) The Orion nebula D) A carbonaceous chondrite