A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. zero
c. 2.0 × 10^-5 T
b. 1.6 × 10^-5 T
d. 4.0 × 10^-5 T
C
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How do we know how old the solar system is?
A) by measuring the rate of the expansion of the universe B) We estimate the age based on how fast the terrestrial planets cooled and solidified. C) by radiometric dating of meteorites D) by measuring how much mass the Sun has lost through fusion over time
At this time, the universe is
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
The most important factor in soil development is
What will be an ideal response?
During each cycle, a refrigerator removes 20.0 kJ of heat from the freezing compartment and ejects 24.0 kJ into a room
(a) How much work per cycle is required each cycle to run this refrigerator? (b) What is the coefficient of performance of this refrigerator?