Helium flash occurs
a. because helium is very explosive and cannot be controlled when the nuclear reactions occur.
b. because degenerate gas does not allow the core to expand as it heats up.
c. in Cepheid variables.
d. in stars with masses less than 0.4 M.
e. None of the other choices are correct.
b
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When a common fluorescent lamp is lit, the mercury vapor inside is actually in a
A) gaseous phase. B) liquid phase. C) plasma phase. D) solid phase. E) none of the above
When you touch a warm pot on the stove,
A) work flows from your hand to the pot. B) work flows from the pot to your hand. C) thermal energy flows from your hand to the pot. D) thermal energy flows from the pot to your hand. E) electric energy flows from the pot to your hand.
Which object has the largest magnitude of rotational acceleration?
A. An object starting from rest and reaching 2 rev/s in 20 sec B. An object rotating at 3 rev/s and coming to a stop in 10 sec C. An object rotating at a constant 4 rev/s
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
a. straight lines in space that go from one magnetic charge to another. b. straight lines in space that are parallel to the wire. c. straight lines in space that are perpendicular to the wire. d. circles that have their centers on the wire and lie in planes perpendicular to the wire. e. circles that have the wire lying along a diameter of the circle.