How many calories are equal to four BTU? (One calorie = 4.186 J, one BTU = 1 054 J.)
a. 1.007
b. 15.89
c. 1007
d. 1589
c
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Assuming that the outside air pressure is standard, 101.3 kPa, what pressure must one generate inside the mouth in order to drink water through a straw whose opening is 12 cm above the water surface?
A. 94.5 kPa B. 102.5 kPa C. 100.1 kPa D. 89.5 kPa
Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image?
A. 20 cm after the second lens B. 20 cm before the second lens C. 10 cm after the second lens D. 10 cm before the second lens E. 50 cm after the second lens
Rays with the shortest wavelengths have the
A) highest frequencies and energies. B) lowest frequencies and energies. C) lowest frequencies but highest energies.
The wavelength of a wave describes ________.
A. the distance a wave will travel after being emitted B. the distance from one end of a laser beam to the other C. the distance between a peak and the nearest trough D. the distance a wave can travel before being absorbed E. the distance between two successive peaks in a wave