Hurricanes can be generated
A) in tropical desert areas.
B) from tropical storms with high levels of moisture and thermal energy.
C) as moist thermal winds cross over the equator.
D) by all of these.
Answer: B
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Force on a Wire: A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section AB of this wire?
A. 0.20 N perpendicular out of the page B. 0.40 N perpendicular out of the page C. 0.11 N perpendicular out of the page D. 0.20 N perpendicular into the page E. 0.11 N perpendicular into the page
Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the magnetic force on the electron. (e = 1.60 × 10-19 C)
A. 2.8 × 10-10 N B. 3.2 × 10-10 N C. 2.8 × 10-12 N D. 3.2 × 10-12 N E. 0 N
In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is
A) elastic. B) elastic or inelastic, depending on the mass of the balls. C) completely inelastic. D) inelastic.
A boat that contains a heavy anchor floats in a small lake. If the anchor is thrown overboard such that it rests upon the lake bottom, which of the following will happen?
(i) The level of the water in the lake will go down slightly. (ii) The level of the water in the lake will go up slightly. (iii) The level of the water in the lake will stay exactly the same. (iv) The waterline on the boat will go up (that is, the boat will sink slightly). (v) The waterline on the boat will go down (that is, the boat will rise slightly). (vi) The water line on the boat will stay the same.
1.(i) and (v) 2.(ii) and (iv) 3.(iii) and (vi) 4.(iii) and (v)