What is a scientific law?
a) A concise statement about a fundamental relationship
or regularity of nature.
b) A tentative explanation of some regularity in nature.
c) A definition of the size of a measured quantity.
d) The basis for all of the various derived units.
a
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Meteor shower debris is believed to come from:
A) the asteroid belt when Mars deflects it toward us annually. B) the core of a differentiated type M asteroid, now broken up. C) the crust of a differentiated type C asteroid, now broken up. D) the disintegration of a short period comet over many returns to the Sun. E) deep space, far beyond the solar system, deflected by the gravity of another star.
How fast must a nonrelativistic electron move so its de Broglie wavelength is the same as the wavelength of a 3.4-eV photon? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 1700 m/s B) 1600 m/s C) 2000 m/s D) 1900 m/s E) 1400 m/s
Two point charges of magnitude + 7.00 ?C and - 9.00 ?C are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively
Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges? A) 0.200 m B) 2.99 m C) - 0.187 m D) - 2.99 m E) 0.187 m
The flatness problem and the horizon problem can be explained by ____
a. dark energy b. the inflationary universe hypothesis c. grand unified theories d. the electroweak force e. non-baryonic matter