Newton's law of cooling applies to objects undergoing
A) cooling.
B) warming.
C) both of these
D) neither of these
Answer: C
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Why does ice float on water?
a. Ice is hydrophobic and repels water. b. Water molecules have less mass the colder they get. c. Water molecules are spaced farther apart in ice than in liquid water. d. Vibrating electrons in liquid water push ice to the surface. e. Hydrogen bonds are weaker in ice.
Inelastic Collisions: In an inelastic collision involving an isolated system, the final total momentum is
A. exactly the same as the initial momentum. B. more than the initial momentum. C. less than the initial momentum.
An unstable particle produced in a high-energy collision is measured to have an energy of 483 MeV and an uncertainty in energy of 84 keV
Use the Heisenberg uncertainty principle to estimate the lifetime of this particle. ( h = 1.055 × 10-34 J • s = 6.59 × 10-16 eV • s)
An AC series circuit contains a resistor of 20 W, an inductor of 50 mH, and a variable capacitor. If the frequency of the applied voltage is 500 Hz, to what setting should the capacitor be set if resonance is achieved?
a. 2.4 µF c. 2.0 µF b. 3.4 µF d. 0.8 µF