In an LCR series circuit with XL > XC, the phase angle between the current and voltage phasors is 30°. If the AC frequency doubles, what is the magnitude of the resulting phase angle?
a. 30°
b. less than 30°
c. more than 30°
d. Additional information is needed to reach a determination.
A
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Which of the following is true about the seasons on Uranus?
A) The seasons on Uranus are not unlike those on Earth or Mars. B) The Uranian rotation axis produces some extreme seasonal effects. C) Like Jupiter, Uranus has little tilt, with its equator always facing the Sun. D) From the Uranian equator, the Sun would remain stationary all the time. E) Uranus' weather will become less turbulent as equinox approaches in 2049.
Angular momentum depends upon
A) mass and velocity. B) mass, velocity, and radius. C) force and radius. D) force, velocity, and radius. E) momentum and angular velocity.
The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits its star more than a factor of ten closer than Mercury's orbit around the Sun. Which is the most plausible explanation for its large size?
A) Planets that are close to a star are heated up and therefore larger. B) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. C) The hydrogen and helium gas compressed under their own gravity. D) It is made of elements other than hydrogen and helium which do not compress under their own gravity.
The natural background radiation we personally encounter is
A) a trace amount. B) about a quarter. C) about half. D) more than half.