An electromagnetic wave has a peak electric field of 3.0 kV/m
What is the intensity of the wave? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 24 kW/m2
B) 12 kW/m2
C) 8.0 kW/m2
D) 4.0 kW/m2
B
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While studying for this quiz you realize that you still have 100 g of lukewarm coffee at 40°C left in a paper cup. When you pour 20 g of boiling water into the cup, the temperature of the resulting coffee-like mixture will be now
A. 67°C. B. 70°C. C. 80°C. D. 50°C. E. 60°C.
_______________ variable stars are useful in measuring the distance to globular clusters
Fill in the blank(s) with correct word
An umbrella tends to move upwards on a windy day principally because
A) trapped air under the umbrella, warms, and rises. B) buoyancy increases with increasing wind speed. C) air pressure is reduced over the curved top surface. D) all of the above
Which of the following has virtually no effect on the internal structure of a planet?
A) its size B) its composition C) its magnetic field D) its mass