A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
0.14 h
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Lake Superior has a shoreline of length 2726 miles. What would be its diameter in km if it were a perfectly circular lake? One mile is 1.609 km.
A. 1694 km B. 1396 km C. 539 km D. 698 km E. 270 km F. 847 km
Energy
a)is the same thing as power. b)is a vector quantity. c)is measured in the same units as work. d)has the same units of velocity. ?
Jill is farsighted and cannot see objects clearly that are closer to the eye than 80.0 cm. What is the refractive power of the contact lenses that will enable her to see objects at a distance of 25.0 cm from her eyes?
A) +2.75 diopters B) -2.75 diopters C) -4.72 diopters D) +4.72 diopters E) +7.00 diopters
Why can't any star, no matter how massive, fuse elements heavier than iron?
A) because the nucleons within iron have the least mass possible B) because elements heavier than iron have less average mass per nucleon C) It could happen, we just have not yet observed a star massive enough to do this. D) Actually, this occurs on a regular basis, which explains the great abundance of heavy elements. s on a regular basis, which explains the great abundance of heavy