We know the Sun is primarily made from hydrogen and helium on the basis of its
A) luminosity.
B) spectrum.
C) age.
D) color.
E) mass.
B) spectrum.
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An airplane with a wingspan of 79.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.490 × l0?4 T. If the induced potential between wingtips is 0.875 V, what is the plane's speed?
a. 54.3 m/s b. 33.9 m/s c. 226 m/s d. 17 900 m/s e. 111 m/s
Evaporation cools the liquid that is left behind because the molecules that leave the liquid during evaporation
a. have kinetic energy. b. have greater than average speed. c. have broken the bonds that held them in the liquid. d. create vapor pressure.
Which of the following statements is incorrect?
What will be an ideal response?
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
a. 0 b. 15 c. 29 d. 63 e. 250