In an isochoric process, the internal (thermal) energy of an ideal gas decreases by 50 J. How much work does the gas do during this process?
A) 0.00 J
B) 25 J
C) 50 J
D) -25 J
E) -50 J
A
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A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 m T magnetic field is perpendicular to both the rod and its velocity. What is the potential difference between the ends of the rod?
A. 12 mV B. 60 mV C. 30 mV D. 15 mV E. 0
The youngest stars in the Orion Nebula and other star-forming regions also show
a. circumstellar disks. b. jets. c. circumstellar disks and jets.
How do we learn the chemical composition of the interstellar medium?
A) by studying spectra of interstellar gas clouds B) We make an educated guess based on the Sun's composition. C) We collect samples of gas and dust from interstellar space. D) We use computer simulations of the interstellar medium.
The center of mass of the solar system is
A) midway between the Sun and Jupiter B) exactly at the center of the Sun C) just outside the orbit of Mercury D) close to but not exactly at the center of the Sun