A kilowatt-hour is equivalent to
A) 3600 J. B) 3600 J/s C) 1000 W. D) 3,600,000 J. E) 3,600,000 J/s.
D
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A cubic box with sides of 20.0 cm contains 2.00 × 1023 molecules of helium with a root-mean-square speed (thermal speed) of 200 m/s
The mass of a helium molecule is 3.40 × 10-27 kg. What is the average pressure exerted by the molecules on the walls of the container? The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. A) 3.39 kPa B) 1.13 kPa C) 570 Pa D) 2.26 kPa E) 9.10 Pa
In the above H-R diagram sketch, which star is a white dwarf?
A. A B. B C. C D. D E. E
A blue camera filter appears blue because it transmits blue light, absorbing all other colors
Indicate whether the statement is true or false
The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
a. macroscopic b. microscopic c. interacting through friction d. All the above choices are valid.