________ are found in the nucleus of atoms.
A. Electrons
B. Protons
C. Neutrinos
D. Mitochondria
E. Positrons
Answer: B
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A sealed container holds 0.020 moles of nitrogen (N2) gas, at a pressure of 1.5 atmospheres and a temperature of 290 K
The atomic mass of nitrogen is 14.0 g/mol. 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. The mass density of the gas is closest to A) 0.90 kg/m3. B) 1.3 kg/m3. C) 1.8 kg/m3. D) 2.2 kg/m3. E) 2.6 kg/m3.
Given that the universe is about 14 billion years old, which of the following statements is logically valid?
A) All galaxies nearby us are about 14 billion years old. B) All galaxies that we can see are about 14 billion years old. C) All galaxies that we see have an age that is approximately equal to the age of the universe today, minus the lookback time (or light travel time) corresponding to the redshift of that galaxy. D) The oldest galaxies we see at great distances are younger than the oldest galaxies we see nearby.
A transformer is a device that normally
A) operates on either dc or ac. B) operates only on ac. C) operates only on dc.
The cataclysmic explosion of a star that throws most of its matter into space is called a _______________
a. supernova b. solar flare c. solar blast d. novaton