A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is
A) 1/2 m/s.
B) 1/5 m/s.
C) 1/6 m/s.
D) 2/3 m/s.
E) 3/2 m/s.
Answer: C
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Tensile Stress and Strain: Which one of the following is an accurate statement?
A. The ratio of tensile stress to tensile strain is called Young's modulus. B. "Strain" has a meaning very close to "force." C. "Stress" has a meaning very close to "stretch." D. Tensile stress is measured in newtons. E. Tensile strain is measured in meters.
Intensity: An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter. What is the rms value of the electric field in this laser beam? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 2200 N/C B. 1000 N/C C. 1100 N/C D. 4100 N/C E. 2000 N/C
Radon is
A) the chemically active element in asbestos. B) a type of electromagnetic radiation that is produced by the sun and partially penetrates Earth's atmosphere. C) the main component in the radioactive fallout from nuclear weapons and nuclear power plant accidents. D) a radioactive gas produced by the rocks and soil that can filter into houses. E) the radioactive substance that will probably be used to irradiate and sterilize food.
The ozone layer
a. reflects all EM waves b. reflects high frequency radio waves c. reflects low frequency radio waves d. is responsible for the greenhouse effect e. absorbs ultraviolet light in sunlight