A gold-plated (gold-covered) piece of jewelery, such as a bracelet, is
a. a compound.
b. a heterogeneous mixture.
c. a homogeneous mixture.
d. an element.
b
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A photoelectric surface has a work function of 2.10 eV
Calculate the maximum kinetic energy, in eV, of electrons ejected from this surface by electromagnetic radiation of wavelength 356 nm. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
The most disorderly arrangement of energy within matter is also
A) the least probable state of matter. B) the most probable state of matter. C) a matter of certainties, not probabilities. D) none of the above
The standard unit of force used by the scientific community is the newton (N). A newton is comprised of a
- kg m/s.
- kg m2/s2.
- kg m2/s.
- kg m/s2.
A railroad freight car, mass 15 000 kg, is allowed to coast along a level track at a speed of 3.0 m/s. It collides and couples with a 54 000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15 000-kg car is preserved in the two-coupled cars after collision?
a. 78% b. 22% c. 18% d. 38% e. 14%