Conversion of Units: An American football field, including end zones, is 360 feet long and 160 feet wide. If you needed to describe it for someone in Europe using the metric system, which one of the following quantities would be closest to its area in square meters? (2.54 cm = 1.00 in.)
A. 4920 m2
B. 5350 m2
C. 88.0 m2
D. 12,100 m2
E. 13,200 m2
Answer: B
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a. operates at a slightly lower temperature than the proton-proton chain. b. is most efficient in star less massive than the sun. c. occurs when carbon and oxygen combine to form nitrogen, which produces energy. d. produces the energy responsible for bipolar flows. e. combines four hydrogen nuclei to form one helium nucleus, which produces energy.
The force required to move a 90.0 kg object in a 85.0 m circle at a constant speed of 8.10 m/s is
a. 0.0 N b. 69.5 N c. 0.77 N d. 8.58 N
If ? = 9.0 V, what is the current in the 15-? resistor?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
How much mass does the Sun lose through nuclear fusion per second?
A) 4 tons B) 4 million tons C) 600 tons D) 600 million tons E) Nothing: mass is conserved.