Hydrogen fusion in the Sun requires a temperature (in Kelvin) of
A) trillions of degrees.
B) any temperature, as long as gravity is strong enough.
C) thousands of degrees.
D) billions of degrees.
E) millions of degrees.
E
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A current loop is placed in a magnetic field which is coming out of the board, as indicated. Will the loop tend to rotate clockwise, counterclockwise, or not at all about a vertical axis?
A. clockwise B. counter-clockwise C. not at all
This diagram shows two energy levels in an atom. The lower level is "full" because it already has an electron with spin up and another with spin down. Therefore, a third electron must go into the higher energy level. What law or principle explains why?
A) the exclusion principle B) the uncertainty principle C) the law of conservation of angular momentum D) the law of conservation of energy
A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage V0. A current I flows through the wire
If the wire were cut in half, making two wires of length L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal), what would be the total current flowing through the two wires? A) 4I B) 2I C) I D) I/2 E) I/4
A fan blade, whose diameter is 1.0 m, is turning with an angular velocity of 2.0 rad/s. What is the tangential velocity of a point on the tip of the blade?
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