The universal accelerating force could NOT be considered:
A) antigravity.
B) Einstein's cosmological constant.
C) dark energy.
D) vacuum pressure.
E) dark matter.
E
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A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, and kept out of the water, what happens to the water level in the tub?
A) It goes up. B) It goes down. C) It does not change. D) It is impossible to determine from the information given.
An unstable particle produced in a high-energy collision is measured to have an energy of 483 MeV and an uncertainty in energy of 29 keV
Use the Heisenberg uncertainty principle to estimate the lifetime of this particle. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19)
Newton's second law is valid only in inertial reference frames
Indicate whether the statement is true or false
If star A is 14.5 times brighter than star B, then what is their magnitude difference?
a. 1.2 b. 2.9 c. 63.1 d. 800 e. 6.2 x 10^5