What is the mass of an object on which Earth exerts a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?
A) 69.9 kg
B) 68.5 kg
C) 71.3 kg
D) 72.7 kg
A
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What can you infer about the lepton number of the anti-neutrino?
A. This quanton has lepton number = +1. B. This quanton has lepton number = -1. C. This quanton has lepton number = 0. D. One cannot determine this quanton’s lepton number from the processes we have studied.
If observations had shown that the cosmic microwave background was perfectly smooth (rather than having slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force. B) the fact that our universe is expanding. C) how galaxies came to exist. D) the existence of helium in the universe.
One philosophical difference between Newtonian and quantum physics is
A) nature is predictable according to Newtonian physics, but nature is unpredictable according to quantum theory. B) Newtonian physics is unable to deal with such abstractions as energy, whereas quantum physics is able to deal with these abstractions. C) Newtonian physics is now known to be incorrect, but scientists have proven that quantum physics is absolutely correct. D) nature is unpredictable according to Newtonian physics, but nature is predictable according to quantum theory. E) Newtonian physics emphasizes the measurement process whereas quantum physics recognizes that the measurement process should not be included in physical theories.
Is it possible to add energy to an isolated material and not have the material's temperature change?
1.No, the material's temperature will always go up when energy is added to it. 2.No, the material's temperature will sometimes go up and sometimes go down when energy is added, but it will always change. 3.Yes, temperature change is not a function of energy added to a material. 4.Yes, in some cases a material's temperature will change when energy is added to the material. In other cases, the material's temperature will not change when energy is added.