An adiabatic expansion refers to the fact that:
a. no heat is transferred between a system and its surroundings.
b. the pressure remains constant.
c. the temperature remains constant.
d. the volume remains constant.
A
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In a photo like the Hubble eXtreme Deep Field (Figure 20.1 in your text), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?
A) the galaxies that are farthest away B) the galaxies that have the most hot, young stars of spectral types O and B C) the galaxies that are the reddest in color D) the galaxies that are nearest to us
A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ?, what is the magnitude of the induced current?
A. 0.70 A B. 0.60 A C. 0.50 A D. 0.80 A E. 0.20 A
Two different gases may have the same emission line spectrum
a. True b. False Indicate whether the statement is true or false
If a lightning bolt involves a discharge of 48 coulombs, about how many electrons are involved?
a. 3 × 10^23 c. 0.3 × 10^18 b. 3 × 10^20 d. 0.3 × 10^8