The element with the most stable nucleus and smallest mass per particle is:
A) uranium.
B) argon.
C) helium.
D) hydrogen
E) iron.
E
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Suppose we compare the combined mass of a C atom and an O2 molecule, both at rest, with the mass of a CO2 molecule, also at rest. According to Einstein's theory, the combined mass of the C and O2 is
A) slightly less, by an amount so small that it hard to measure, than the CO2 molecule's mass. B) precisely equal to the CO2 molecule's mass. C) considerably more than the CO2 molecule's mass. D) considerably less than CO2 molecule's mass. E) slightly more, by an amount so small that it hard to measure, than the CO2 molecule's mass.
The sky appears to be blue during the day because:
1.Air absorbs blue light less than other frequencies (i.e., acts like a blue filter). 2.Air molecules emit blue light after being struck by sunlight. 3.The sky reflects blue light from the oceans. 4.The temperature high in the Earth's upper atmosphere is 1000 K. 5.None of the above.
By adjusting a TV image with a remote you can
A) affect only the image. B) participate with the action on the screen. C) both of these D) neither of these
A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. Which of the sets can only occur if the rigid body rotates through more than 180°?
1.3 rad, 6 rad 2.-1 rad, 1 rad 3.1 rad, 5 rad