Consider a classroom 10.0 m long by 6.0 m wide by 4.0 m high at "room temperature" 20.°C and 1.0 atmosphere
(a) How many moles of gas are contained in the room?
(b) Assuming an average molecular weight of 28, what is the mass of the room air?
(a) 10. × 103 gram-moles
(b) 2.8 × 102 kg
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Fundamental Forces: A stable nucleus contains many protons very close to each other, all positively charged. Why do the protons not fly apart due to mutual Coulomb repulsion?
A. An attractive nuclear force in the nucleus counteracts the effect of the Coulomb forces. B. There are an equal number of electrons in the nucleus which neutralize the protons. C. The neutrons in the nucleus shield the protons from each other. D. The Coulomb force does not operate within nuclei. E. The gravity of the protons and neutrons overcomes their repulsion at such close distances.
A changing magnetic field produces an electric field
a. True b. False Indicate whether the statement is true or false
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal and opposite to the flux through the other half of the Gaussian surface. This is
a. never true. b. never false. c. true whenever enclosed charge is symmetrically located at a center point, or on a center line or centrally placed plane. d. true whenever no charge is enclosed within the Gaussian surface. e. true only when no charge is enclosed within the Gaussian surface.
A neutral atom has electron configuration 1s22s22p63s23p2. What element is this?
A) carbon B) iron C) nitrogen D) silicon E) germanium