What is the correct formula for calcium phosphate?
a. Ca3P2
b. Ca2(PO4)3
c. Ca3(PO4)2
d. Ca2P3
c
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Which of the following systems is most likely to contain a black hole?
A) an x-ray binary in which the unseen companion has a mass 2 MSun B) an x-ray binary in which the unseen companion has a mass 10 MSun C) an x-ray binary that undergoes frequent x-ray bursts D) a binary system in which novae have been observed to occur E) a system that has recently undergone a white dwarf supernova
Newton's third law of motion states that the force pair acting on different objects consists of two forces that
a. are under the influence of gravity. b. are equal and in the same direction. c. always produce an acceleration. d. are equal and in opposite directions.
The average mass of the atoms of an element in naturally occurring samples is called the ______________ mass of the element
a. atomic b. average c. relative d. molecular
A particle moving with a constant acceleration has a velocity of 20 cm/s when its position is x = 10 cm. Its position 7.0 s later is x = -30 cm. What is the acceleration of the particle?
a. -7.3 cm/s2 b. -8.9 cm/s2 c. -11 cm/s2 d. -15 cm/s2 e. -13 cm/s2