Lift on an aircraft wing is best explained by: a) Archimedes principle b) Bernou

Question

Lift on an aircraft wing is best explained by: a) Archimedes principle b) Bernoulli's principle c) Newton's first law If you were walking around midtown Manhattan during the afternoon rush hour, the sound level would probably be around: a) 20 dB b) 80 dB c) 130 dB Sound intensity is measured in units of watts/m^2. A watt is a unit of: a) velocity b) energy c) power which is louder 95 dB or 0.001 watts m^2? a) 95 dB b) 0.001 watts/m^2 c) they both are the same the same If a molecule is said to be electrically neutral, this means: a) the total charge on it is zero b)it has more neutrons than either protons or electrons c) it has more protons than electrons Radio waves are a part of the electromagnetic spectrum. Is it possible for people to hear radio waves? a) yes b) no c) it depends on the weather conditions at the time

Explanation / Answer

1)

Bernoullis principle

3)

power

4)

intensity level of 0.001 W/m^2 = 10*log(0.001/10^-12) = 90 dB

95 dB is louder

5)

the total charge on it zero

6)

no

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