Atoms that have the same number of protons but a different number of neutrons are called ____
a. ions
b. elements
c. isotopes
d. molecules
e. nucleons
c
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Spherical Mirrors: If a spherical convex mirror has a radius of curvature R, the magnitude of its focal length is
A. R/2. B. R/4. C. R. D. 2R. E. 4R.
A rope is held from one end in such a way that the lower end just touches a table. The rope is then lowered onto the table with constant velocity. The force that is needed to hold the upper end of the rope is
A) equal to the weight of the portion of the rope that is not on the table. B) greater than the weight of the portion of the rope that is not on the table. C) less than the weight of the portion of the rope that is not on the table but not zero N. D) zero N. E) Cannot be determined without additional information.
__________ a physical state of being physiologically overwhelmed that is associated with a heart rate of over 100 bpm and oxygen concertation that falls below 95.
Fill in the blank(s) with the appropriate word(s).
Consider the elliptical orbit of a comet around the Sun. Where in its orbit does it have the largest amount of total orbital energy?
A) when it is farthest from the Sun B) when it is closest to the Sun C) It always has the same total orbital energy.