According to the law of reflection, the incident ray, reflected ray, and normal between them
A) lie in the same plane.
B) may or may not lie in the same plane.
C) lie in planes that are perpendicular to one another.
Answer: A
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First Law of Thermodynamics: A sealed rigitd tank contains 30 moles of an ideal gas, at an initial temperature of 270 K. The pressure of the gas is increased until the final pressure equals 1.40 times the initial pressure. The heat capacity at constant pressure of the gas is 32.0 J/mol ? K. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. 77 kJ B. 100 kJ C. 130 kJ D. -50 kJ E. -23 kJ
Interstellar gas is composed of
A) only hydrogen. B) 90% hydrogen, 9% helium by weight. C) 10% hydrogen, 90% helium by numbers of atoms. D) some hydrogen, but mainly carbon dioxide. E) ammonia, methane, and water vapor.
The hydrogen in the universe was formed by
a. the energy of the Big Bang c. radioactive decay of heavy elements b. nuclear fusion reactions in stars d. none of the above
The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field?
a. zero b. 180° c. 90° d. 45°