The equation 1H2SO4 ? 1H2O + 4O2 is not appropriately written because
a. oxygen is not diatomic.
b. fractional coefficients are not generally used.
c. the number of atoms of each element on each side is not the same.
d. the simplest set of coefficients has not been used.
c
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Even though K- and M-type stars are suitable for life, why might they not have many habitable planets around them?
A) because their habitable zones are very wide B) because their habitable zones are very narrow C) because their lifetimes are too short D) because they contain too few heavy elements to form planets
Two charges QA = +2 ?C and QB = - 6?C are located on the x-axis at xA= - 1 cm and xB= +2 cm respectively. Where should a third charge, QC = + 3?C, be placed on the positive x-axis so that the potential at the origin is equal to zero?
A) x = 4 cm B) x = +1 cm C) x =+2 cm D) x = 3 cm E) x = 5 cm
Hydro and wind power are indirect forms of
A) solar energy. B) fossil fuels deep down. C) nuclear energy in Earth's interior. D) none of the above
A series circuit consists of a 50-Hz ac source, a 50-? resistor, a 0.50-H inductor, and a 60-?F capacitor. The rms current in the circuit is measured to be 3.1 A. What is the voltage amplitude of the source?
A) 220 V B) 160 V C) 510 V D) 180 V E) 270 V