The mass of a neutron star is
a. several time that of the Sun.
b. about the same as that of the Sun.
c. about the same as Earth.
d. smaller than any of these.
a
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Compared to the average size of a hydrogen atom, the average size of a helium atom is
A) larger. B) smaller. C) about the same.
Buoyant force is greatest on a submerged
A) 1-kg block of lead. B) 1-kg block of aluminum. C) same on each
A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W. At what rate is the internal (thermal) energy of the gas changing?
A) 56.1 W B) 318 W C) -56.1 W D) 187 W
The magnetic force on a current-carrying wire in a magnetic field is the strongest when
A) the current is in the direction of the magnetic field lines. B) the current is in the direction opposite to the magnetic field lines. C) the current is at a 180° angle with respect to the magnetic field lines. D) the current is perpendicular to the magnetic field lines. E) the current is at a 0° angle with respect to the magnetic field lines.