Estimate the buoyant force of 1-mm-diameter water vapor bubbles in sea water at 100C. Sea water can be assumed to have a density 10% more than pure water, and the surface tension of water can be assumed to be 65 mN/m.
What will be an ideal response?
A buoyant force acting on a submerged body has a volume V is the product of the volume with the specific weight of the surrounding fluid.
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A dolphin perceives its environment by the sense of
A) sight. B) sound. C) both of these D) neither of these
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
A) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) B) 300 thousand km (300,000, or 3 × 105 km) C) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) D) 18 million km (18,000,000, or 1.8 × 107 km)
As the name quasi-stellar radio sources implies, all quasars are strong radio sources
Indicate whether the statement is true or false
Radioactive decay is involved in
a. irradiating food to destroy harmful bacteria. b. keeping the interior of the Earth hot. c. making smoke detectors work. d. finding flaws in jet engine parts. e. all of the above.