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) 4,920 m2
B) 5,350 m2
C) 88.0 m2
D) 12,100 m2
E) 13,200 m2
B
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Most of the mass of the Milky Way seems to exist in the form of
A) population II stars in the Halo. B) dark matter out in the Halo. C) population I stars in the disk. D) hydrogen gas in the disk and spiral arms. E) the black hole in the Galactic Center.
An archer pulls her bow string back 0.40 m by exerting a force that increases uniformly from zero to 240 N. What is the equivalent spring constant of the bow, and how much work is done in pulling the bow?
A box of mass 50 kg is at rest on a horizontal frictionless surface. A constant horizontal force F then acts on the box and accelerates it to the right. It is observed that it takes the box 6.9 seconds to travel 28 meters
What is the magnitude of the force?
Two transparency sheets are rubbed with tissue paper and then the two transparency sheets are held up near each other. This experiment demonstrates that
A) similarly-charged objects attract each other. B) similarly-charged objects exert magnetic forces on each other. C) differently-charged objects attract each other. D) differently-charged objects repel each other. E) similarly-charged objects repel each other.