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

Physics & Space Science

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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

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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

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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.

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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

Physics & Space Science