When a ?- particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) increases by 1.
B) decreases by 1.
C) increases by 2.
D) decreases by 2.
E) does not change.
A
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When two or more different capacitors are connected in parallel across a potential source (battery), which of the following statements must be true? (There could be more than one correct choice.)
A) The potential difference across each capacitor is the same. B) The capacitor with the largest capacitance has the largest potential difference across it. C) The equivalent capacitance of the combination is less than the capacitance of any one of the capacitors. D) Each capacitor carries the same amount of charge. E) The capacitor with the largest capacitance has the most charge.
You throw a Frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the Frisbee. Ignoring air resistance, the torque exerted about its center of mass by gravity is
a. 0. b. mgr. c. 2mgr. d. a function of the angular velocity. e. small at first, then increasing as the Frisbee loses the torque given it by your hand.
Which type of planet once had (or has) a molten core?
A) Dwarf B) Terrestrial C) Jovian
Overall, what is our most accurate technique for measuring the distance to a nearby star?
A) radar ranging B) stellar parallax C) Hubble's law D) white dwarf supernovae