Intensity: How much energy is transported across a 1.00-cm2 area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 0.44 nJ
B. 0.44 ?J
C. 0.44 mJ
D. 0.44 J
Answer: D
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An object starts with an initial velocity of 4.0 m/s and accelerates with an acceleration of +4.0 
for 6.0 seconds. It then decelerates at -2.0 
until its velocity is 4.0 m/s. The total distance covered is
A. 67 m. B. 94 m. C. 105 m. D. 192 m. E. 215 m.
What is the universe mostly made of?
A) ordinary matter, including intergalactic gas B) dark matter C) electromagnetic radiation D) neutrinos E) None of the above.
Relative Velocity: A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. How fast can she swim in still water?
A. 0.50 m/s B. 0.80 m/s C. 1.2 m/s D. 1.4 m/s E. 1.8 m/s
The diffusion constant for water in air is
How long would it take a water molecule to diffuse a distance of 10.0 meters?
A. 400 hours B. 450 hours C. 500 hours D. 580 hours E. 600 hours