Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm. What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?
A) +36.4 cm
B) -36.4 cm
C) -21.2 cm
D) +21.2 cm
E) +32.5 cm
A
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Why is a more massive terrestrial planet more likely to have an atmosphere than a less massive planet?
A. Its interior is hotter. B. It has a larger gravitational force. C. It had a larger primordial atmosphere. D. It has a larger magnetic field. E. All of these choices are correct.
The tail of a comet always points:
A) toward the Sun and disappears at perihelion. B) toward Earth and never varies. C) away from the Sun and disappears at perihelion. D) away from the Sun and becomes longest and brightest at perihelion. E) in the direction of the comet's motion.
What source of energy might keep water beneath the surface of Enceladus liquid?
A) tidal heating only B) radioactive decay only C) tidal heating and radioactive decay D) heat released from a partially molten core
An intercooler of an air compressor is to use a finned flat tube heat exchanger as shown in Figure 9-29. Compressed air at 100 psia, 130ºF passes through the tubes at 100 ft/s and air at 14.7 psia, 70ºF, and 100 ft/s passes around the tubes. Determine the convective heat transfer coefficient, the friction factor for the cooling air outside the tubes, and the overall convective heat transfer coefficient for the intercooler. Assume the inside dimensions of the flattened tubes are 0.105 in by 0.865 in.
