Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses.
B) oscillating electric and magnetic fields.
C) particles of light energy.
D) high-frequency sound waves.
Answer: B
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A monster turnip (assumed spherical) weighing in at 0.45 kg is dropped into a cauldron of water boiling at atmospheric pressure. If the initial temperature of the turnip is 17°C, how long does it take to reach 92°C at the center? Assume that
GIVEN
FIND
Time needed to reach 92°C at the center
ASSUMPTIONS
SKETCH
The magnetic field due to a 2-A current flowing in a long, straight wire is 8 ?T at a point P, a certain distance away from the wire. How far is this point from the center of the wire?
A) 2 cm B) 3 cm C) 4 cm D) 5 cm E) 6 cm
The zeroth law of thermodynamics allows us to define:
A. work B. pressure C. temperature D. thermal equilibrium E. internal energy
If the temperature of the Earth warms up how does the carbon dioxide cycle respond?
A) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere B) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production C) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production D) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere