The Large Megllanic Cloud is
A) a bright nebula within our galaxy.
B) an irregular galaxy colliding with the Milky Way.
C) the farthest known object visible to the naked eye in a clear night time sky.
D) an unusually bright planetary nebula.
Answer: B
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An AC series circuit has 18.9-? resistance, 21.1-? inductive reactance, and 15.5-? capacitive reactance. If an effective (rms) emf of 94 V is applied, what is the power output?
a. 2.34E+2 W b. 1.60E+2 W c. 4.66E+2 W d. 4.30E+2 W e. 2.32E+2 W
A microscope has a tube length of 20 cm. The objective’s focal length is 2.0 cm and the eyepiece focal length is 0.50 cm. What is the “approximate” magnification provided by this microscope? (The “approximate” is found using qobjective = L.)
1.–200 2.–500 3.–1000 4.–2000
A 2.0-m2 Thermopane window is constructed, using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 20°C from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 W / m •°C and for air 0.0234 W / m •°C.)
a. 7700 W c. 180 W b. 90 W d. 550 W
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5000 m? (The mean radius of the Earth is 6.38 × 106 m.)
A) 0.6 N B) 1.6 N C) 2.6 N D) 3.6 N E) 5.2 N