A star's luminosity depends only on the star's
a. distance and diameter.
b. temperature and distance.
c. distance.
d. temperature and diameter.
e. apparent magnitude.
D
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Lisa Ann is nearsighted with a near point of 75. cm
(a) What FOCAL LENGTH is this? (b) What POWER lens is needed to correct her nearsightedness (assuming distance from lens to eye is negligible)?
A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor
a. 0.96 mT b. 1.7 mT c. 0.55 mT d. 1.2 mT e. 0.40 mT
Air expands adiabatically (no heat in, no heat out) from T = 300 K and P = 100 atm to a final pressure of 1 atm. Treat the gas as ideal with ? = 1.4, and determine the final temperature. Compare your result to the boiling points of nitrogen (77.4 K) and oxygen (90.2 K). Could this method result in the liquification of air?