The work done by the centripetal force on an object with a mass of 1 kg moving with a constant velocity of 4 m/s into a circular path of radius 0.6 m for one full cycle is
A)
100.7 J
B)
3.8 J
C)
0 J
D)
40 J
E)
80 J
C
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The Big Bang predicts that after the universe was born it
A) consisted of an equal mixture of all the chemical elements B) was completely empty C) consisted of mostly hydrogen and helium D) consisted of mostly carbon, hydrogen, oxygen and nitrogen
What is the name of the earthquake scale that describes the severity of an earthquake by noting the amount of damage it causes?
a. Richter scale b. Mohs scale c. Torino scale d. Modified Mercalli scale.
Why are auroras produced only near the northern and southern magnetic poles of a planet?
a. Those are the locations where the atmosphere is thinner, letting particles penetrate. b. The poles are pointing toward the Sun, so they receive more solar wind particles. c. The oxygen atoms responsible for auroral emission only exist near the poles. d. Charged particles are forced to flow along Earth's magnetic field lines, which come out of Earth's poles.
Using only pencil and paper calculations, Arrhenius concluded that a doubling of the carbon dioxide concentration would raise global temperatures by about _____.
A. 1° C B. 2° C C. 5° C D. 15° C