The fact that the sky is dark at night proves that the universe cannot be
A) eternal and unchanging with an infinite number of stars.
B) expanding.
C) more than 20 billion years old.
D) infinite in size.
A) eternal and unchanging with an infinite number of stars.
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The tensile stress where plastic strain is equal to 0.002 is equal to the _____________stress.
Fill in the blank(s) with the appropriate word(s).
Two long parallel wires carry currents of 10 A in opposite directions
They are separated by 40 cm. What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A) A) 1.5 µT B) 3.3 µT C) 6.7 µT D) 33 µT E) 67 µT
A person has a mass of 45 kg. How much does she weigh on the Moon, where g = 1.62 m/s2?
A) 45 N B) 73 N C) 7.4 N D) 220 N E) 440 N
A set of ten minerals used as reference standards in determining hardness is called the______________ hardness scale
Fill in the blank(s) with correct word