If the efficiency of a reversible engine is 28.%,
(a) what is its COP operated as a refrigerator?
(b) what is its COP operated as a heat pump?
(a) 2.6
(b) 3.6
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The star Wolf 359 is 7.7 light years away. What is that distance in kilometers?
a. 7.7 x 10^8 km b. 14 x 10^13 km c. 0.78 x 10^8 km d. 7.28 x 10^13 km e. 7.28 x 10^12 km
Which two properties are most important in determining the surface temperature of a planet?
A) composition and distance from the Sun B) size and chemical composition C) size and atmosphere D) internal temperature and atmosphere E) distance from the Sun and atmosphere
For general projectile motion if we neglect air, the horizontal component of a projectile's velocity
A) remains zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) first decreases and then increases.
An electron is in an infinite square well (a box) that is 8.9 nm wide
What is the ground state energy of the electron? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 0.0048 eV B) 0.0057 eV C) 0.0066 eV D) 0.0076 eV E) 0.0085 eV