What is the equivalent resistance between points A and B in the figure when R = 18 ??
a.
48 ?
b.
64 ?
c.
80 ?
d.
96 ?
e.
110 ?
d
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The temperature of the layer of gas that produces the visible light of the Sun is
A) 3,500 K B) 5,800 K C) 12,300 K D) 300,000 K E) 15 million K
The figure shows a cross section of three parallel wires each carrying a current of 24 A. The currents in wires B and C are out of the paper, while that in wire A is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire A?
A. 15 mN B. 77 mN C. 59 mN D. 12 mN E. 32 mN
A hockey puck traveling at speed v on essentially frictionless ice collides elastically with one end of a straight stick lying flat on the ice. In this collision
a. momentum is conserved. b. angular momentum is conserved. c. energy is conserved. d. all of the above are conserved. e. only momentum and angular momentum are conserved.
Time Dilation: One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on his spaceship. At the end of this trip, what are (a) his own age and (b) the age of his Earth-based twin brother?
A. (a) 20 y (b) 30 y B. (a) 30 y (b) 50 y C. (a) 50 y (b) 70 y D. (a) 70 y (b) 90 y