Which of the following gases is a trace natural constituent of the air?
a. CO
b. SO2
c. CO2
d. NO2
c
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Superconductors most often require
A) low operating temperatures. B) high operating temperatures. C) magnets.
Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, each with a speed 0.50c relative to Earth. As measured by a passenger in one of the spaceships, how long is the other spaceship?
A) 50 m B) 60 m C) 70 m D) 80 m E) 90 m
What are the very cold (about 20 K), dense clouds of gas thought to be the most massive objects in the Galaxy called?
A) emission nebulae B) absorption clouds C) dust clouds D) molecular clouds E) reflection nebulae
A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60° with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil?
a. 55 mV b. 46 mV c. 50 mV d. 60 mV e. 35 mV