A type B9 star is hotter than a type A0
Indicate whether the statement is true or false
TRUE
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The figure shows a cross section of three parallel wires each carrying a current of 15 A. The currents in wires A and C are out of the paper, while that in wire B 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 C?
a.
90 mN
b.
54 mN
c.
30 mN
d.
18 mN
e.
36 mN
Which design is subject to chromatic aberration?
A) refractor B) prime focus reflector C) Newtonian reflector D) Cassegrain reflector E) Gregorian reflector
A meteorologist getting ready for a weather report notes that the wet bulb of a psychrometer has a reading of 60°F when the air temperature is 70°F. What would be the resulting reports for (a) the relative humidity and (b) the dew point temperature?
What processes are involved in the sunspot cycle?
A) gravitational contraction of the Sun B) wave motions in the solar interior C) variations of the solar thermostat D) the winding of magnetic field lines due to differential rotation E) the interaction of the Earth's magnetic field with that of the Sun