During a thermodynamic process, the entropy of a certain system decreases by 1.0 J/K. What are some possible entropy changes that could have occurred within the system's surrounding environment?
1.Its entropy could have also decreased by 1.0 J/K.
2.Its entropy could have remained constant.
3.Its entropy could have increased by 2.5 J/K.
4.All of these could have occurred.
3
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Vega is an A0 V star. Based on this information, which of the following are true? I. Vega has a surface temperature less than the Sun. II. Vega has a mass that is greater than that of the Sun. III. Vega is more luminous than the Sun. IV. Vega is located in the upper left-hand corner in the H-R diagram
a. I & II b. II & III c. II, III, & IV d. I, II, & III e. I, II, III, & IV
A projectile is shot straight up from the surface of Earth by means of a very powerful cannon and experiences no appreciable air resistance If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon? (G = 6.67 × 10-11 N ? m2/kg2, the radius of Earth is 6.38 × 106 m, and Mearth = 5.97 ? 1024 kg)
A) 355 m/s B) 505 m/s C) 827 m/s D) 710 m/s E) 906 m/s
Human hearing is most sensitive around 2500 Hz. If the speed of sound is 340 m/s, what is the wavelength of this sound?
A. 340 m B. 0.14 m C. 2160 m D. 7.4 m
What is the Kuiper belt?
A) a region of the solar system beginning just beyond the orbit of Neptune that contains many icy comets B) a region of the solar system that extends almost a fourth of the way to the nearest stars and contains a trillion comets with orbits going in all directions around the Sun C) a technical name for the asteroid belt D) the most prominent ring of Saturn that is visible in photographs