Conversion of Units: The following conversion equivalents are given: 1.0 mile = 5280 ft 1.0 ft = 12 in 1 m = 39.37 in1.0 hour = 60 min 1.0 min = 60 sIf a deer runs at 4.7 mi/h, its speed, in meters per second, is closest to
A. 2.1 m/s.
B. 1.7 m/s.
C. 1.9 m/s.
D. 2.3 m/s.
E. 2.5 m/s.
Answer: A
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Resistance and Resistivity: Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?
A. Both wires have the same resistivity. B. The longer wire has 3 times the resistivity of the shorter wire. C. The longer wire has 9 times times the resistivity of the shorter wire. D. The longer wire has 27 times times the resistivity of the shorter wire.
A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
Based on what the nebular theory tells us about the formation of our own solar system, what does the theory predict for the possibility of other planetary systems?
a. Planetary systems should be common. b. Other planetary systems should be identical to our own. c. Most stars should have one or two planets, but not more. d. Planetary systems should be very rare.
Traveling waves are created on a rope that has a mass per length 0.200 kg/m that is stretched with a tension of 400 N
If the end of the rope is moved up and down with simple harmonic motion with amplitude 30.0 cm and a period 1.40 s, how much work is done in one period of the motion? A) 133 J B) 400 J C) 267 J D) 11.3 J E) No work is done because the tension pulls outward along the rope, but the end of the rope moves perpendicular to the rope.