Which of the following is not associated with a solid that has covalent bonding?
a) Localized valence electrons
(b) High cohesive energy
(c) Close-packing of atoms
(d) Low density relative to molar weight
(c) Close-packing of atoms
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For photovoltaic cells, the potential difference for two silicon cells in series will at most be ________
a. 0.1 b. 0.5 c. 1.0 d. 2.0 e. 5.0 volts.
A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate. b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.
First Law of Thermodynamics: During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the change in internal (thermal) energy of the gas?
A. 0 J B. 2.5 J C. 5.0 J D. 10 J
Estimate how many times you would have to fold a sheet of paper until it becomes as thick as a large dictionary (approximately 10 cm thick)
A) 10 times B) 50 times C) 100 times D) 500 times E) 1000 times