Which statement below regarding the First Law of Thermodynamics is most correct?
a. A system can do work externally only if its internal energy decreases.
b. The internal energy of a system that interacts with its environment must change. c. No matter what other interactions take place, the internal energy must change if a system undergoes a heat transfer.
d. The only changes that can occur in the internal energy of a system are those produced by non-mechanical forces.
e. The internal energy of a system cannot change if the heat transferred to the system is equal to the work done by the system.
E
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Two charges of 15 pC and ?40 pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube.
A. +2.8 N ? m2/C B. ?1.1 N ? m2/C C. +1.1 N ? m2/C D. ?2.8 N ? m2/C E. ?0.47 N ? m2/C
Cloud dissipation results from
a. an inverted lapse rate. b. hygroscopic nuclei. c. supercooled vapor. d. descending air.
Following a series of experiments in which you are flung against walls to test the resiliency of the human body, you are ejected from the ship and find yourself in a maelstrom
Whipped by winds gusting at 10,000 km/hr, rising and falling in convective currents, you are not having a good time. On the rare occasions when you can assess your surroundings, you notice a horizon that seems to go on "forever" (or, at least, much farther than the horizon on Earth), and no solid surface anywhere. You get a glimpse of several large moons. The Sun races through your sky, requiring only about 5 hours to rise nearly due east, cross the meridian at an altitude of about 55° in the north, and then set due west.
A solid steel column is 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 2.0 × 1011 N/m2. By what distance does the column shrink when a 5000-kg truck is supported by it?
A) 3.2 × 10-6 m B) 8.0 × 10-7 m C) 3.1 × 10-5 m D) 7.8 × 10-6 m