A flat circular wire loop lies in a horizontal plane on a table and carries current in a counterclockwise direction when viewed from above. At this point, the earth's magnetic field points to the north and dips below the horizontal
Which side of the coil tends to lift off of the table due to the magnetic torque on the loop? A) the north side
B) the east side
C) the south side
D) the west side
E) The entire loop lifts straight up.
C
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First Law of Thermodynamics: In an adiabatic compression, 200 J of work is done on a gas. What is the change in internal (thermal) energy of the gas during this compression?
A. 0 J B. 100 J C. 200 J D. -200 J
When observing the Sun in visible light, the photosphere appears brighter than the corona. However, when observing the Sun in x-rays, the corona appears brighter. The reason for this is that
A. the gas in the corona has a much lower density than that in the photosphere and so emits mostly emission lines at x-ray wavelengths.
B. the temperature in the corona is more than 1 million K while that in the photosphere is about 5800 K and so the corona emits a larger fraction of its luminosity at short wavelengths.
C. more nuclear reactions are occurring in the corona than the photosphere and these produce high-energy (x-ray and gamma-ray) photons.
A motor that can do work at the rate of 2 hp has 60% efficiency. How much current does it draw from a 120. V line? (1 hp = 746 W)
What will be an ideal response?
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ? K
A) 850 nm B) 907 nm C) 311 nm D) 483 nm E) 502 nm