You are moving at 120 km/h toward a stationary train. The train blows its 0.400-kHz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?
A) 361 Hz B) 444 Hz C) 364 Hz D) 439 Hz
D
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Over the course of a night, Polaris moves less than any other visible star in the sky
Indicate whether the statement is true or false
When white light goes from air into water, the color that refracts the most is
A) red. B) orange. C) green. D) violet. E) all refract the same amount.
Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries
A. The gasoline has about 400 times as much energy. B. The gasoline has about 10 times as much energy. C. The gasoline has about 70 times less energy. D. They cannot be honestly compared, since one stores power and the other stores energy.
A piece of wire 15 m long is cooled from 40°C to –9°C and the change in length is –12.7 mm.
(a) What is the linear coefficient of thermal expansion for this material? (b) Identify the material based upon the measured coefficient of thermal expansion.