One hundred lbm of air in a pressure tank is cooled from 180ºF and 160 psia to 80ºF when the surroundings are at 70ºF. Determine the tank pressure at 80ºF.
What will be an ideal response?
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Saturn’s many moons affect its rings through
A. tidal forces. B. orbital resonances. C. magnetic field interactions.
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
a. 4.7 mm b. 18 mm c. 3.8 mm d. 2.8 mm e. 5.7 mm
A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The power factor, cos ?, is
a. ?1.00. b. ?0.936. c. +0.943. d. +0.936. e. +1.00.
Geologic evidence that supports the theory of continental drift does not include
a. glaciation in the Southern Hemisphere. b. drag marks on the ocean floor. c. continuity of geologic structures. d. the discovery of the same fossils on different continents.