A river flows toward the East at 1.5 m/s. Steve can swim 2.2 m/s in still water. If he wishes to cross the river so that his direction is northward, what direction relative to the water must he swim?
a. 
b. 
c. 
d. 
b.
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The fresh newly created surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters. b. appear dark in color with many impact craters. c. appear very bright because fresh ice is very reflective. d. generally show long bright grooves and a modest number of impact craters. e. generally have small volcanoes that are active.
An aluminum beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 60 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 16 mm
(C) 22 mm
(D) 26 mm
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
A. 0. B. 0.012 N, East. C. 0.012 N, West. D. 0.30 N, West. E. 300 N, East.
An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole. b. The nail becomes a north pole or a south pole. c. The magnet exerts an attractive force on the nail. d. The nail exerts an attractive force on the magnet. e. The nail is ferromagnetic.