A straight wire of length l is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. If the resistance of the rod is R, what is the current through the rod?
a. R/Blv
b. Blv/R
c. B2l2v2/R2
d. not given
d
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The technique of connecting multiple telescopes together to combine the images from each telescope is known as
a. abberation. b. resolving power. c. active optics. d. adaptive optics. e. interferometry.
Household circuits are wired in parallel. Adding more appliances to a parallel circuit
A. increases the voltage sent to each appliance. B. decreases the current sent to each appliance C. increases the current drawn from the circuit but does not change the current to each appliance.
At what temperature is the rms speed of hydrogen molecules, H2, which have a molecular weight of 2.02 g/mole, equal to 2.0 km/s? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol
A) 17°C B) 51°C C) 68°C D) 72°C E) 34°C
Which are bigger—Celsius degrees or Fahrenheit degrees?
a. Fahrenheit b. Celsius c. Neither—they are the same size. d. This is a nonsensical comparison.