If the path of polar wandering found from two continents are not the same, then we can say that
A) Earth's magnetic history has been very complex.
B) at least one of the continents has moved.
C) our radioactive dating techniques have been inaccurate.
D) the continents have always been widely separated.
Answer: B
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If an R = 1.0-k? resistor, a C = 1.0-?F capacitor, and an L = 0.20-H inductor are connected in series with a V = 150 sin (377t) volts source, what is the maximum current delivered by the source?
a. 0.007 0 A b. 27 mA c. 54 mA d. 0.31 A e. 0.34 A
A brass wire (d 5 2.0 mm, E 5 110 GPa) is pretensioned to T 5 85 N. The coefficient of thermal expansion for the wire is 19.5 3 1026/°C. The temperature change at which the wire goes slack is approximately:
(A) 15.7 °C
(B) 212.6 °C
(C) 112.6 °C
(D) 218.2 °C
Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?
a. It is at a maximum. c. It is downwards. b. It is upwards. d. It is zero.
What is the main difference between a soap and a detergent?
A) Soaps are made from fatty acids, detergents are synthetic. B) Soaps are biodegradable, detergents are not. C) Detergents are better than soaps. D) Soaps are all natural. E) Soaps and detergents are exactly the same.