The Sun is a ball of hot gas held together by its own gravity
a. True
b. False
Indicate whether the statement is true or false
True
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A heat pump uses 200 J of work to output 300 J of heat into a heat reservoir at 200 K. What is the coefficient of performance for the heat pump?
A. 1.0 B. 1.5 C. 2.5 D. 2.8
A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV. If a 1.0-V stopping potential is required to make the electron current zero,
what is the wavelength of light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 355 nm B) 423 nm C) 497 nm D) 744 nm
If 25 kg of ice at 0°C is combined with 4 kg of steam at 100°C, what will be the final equilibrium temperature (in °C) of the system?
a. 40 b. 20 c. 60 d. 100 e. 8
The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. What is the angular magnification of the telescope?
A) 34 B) 480 C) 68 D) 0 E) 7.5