Water can be brought to a boil by
A) supplying thermal energy.
B) reducing air pressure on its surface.
C) both of these
D) neither of these
Answer: C
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Two speakers in an automobile emit sound waves that are in phase at the speakers. One speaker is 40 cm ahead of and 30 cm to the left of the driver's left ear. The other speaker is 50 cm ahead of and 120 cm to the right of the driver's right ear. Which of the following wavelengths is(are) in phase at the left ear for the speaker on the left and the right ear for the speaker on the right?
A. 10 cm B. 20 cm C. 650 cm D. All of the wavelengths listed above. E. Only the wavelengths listed in (a) and (b).
A sound of 40 decibels is
A) four times as intense as a sound of 20 decibels. B) twice as intense as a sound of 20 decibels. C) 1000 times as intense as a sound of 20 decibels. D) 100 times as intense as a sound of 20 decibels. E) 10 times as intense as a sound of 20 decibels.
The heat of fusion for ice at 0 
is 333.7 kJ/kg. What is the energy needed to melt 100 grams of ice at 0.00
A. 39.4 kJ B. 12.7 kJ C. 17.5 kJ D. 25.5 kJ E. 33.4 kJ
A "rainbow" appears on an oil slick or soap bubble due to:
1.refraction of light. 2.transmission of light. 3.dispersion of light. 4.interference of light. 5.scattering of light. 6.reflection of light. 7.None of the above.