Physics, 11.03.2021 17:00, guzmangisselle
The J/ψ meson, discovered in 1974, was measured to have an average mass of mav =3100 MeV/c2 (note the use of energy units since E = mc2) and an intrinsic width ∆m=63 keV/c2. By this we mean that the masses of different J/ψ mesons were actually measured to be slightly different from one another. This mass “width” is related to the very short lifetime of the J/ψ before it decays into other particles. Estimate its lifetime using the uncertainty principle.
Answers: 3
Physics, 22.06.2019 05:20, lea5261
Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.
Answers: 2
Physics, 22.06.2019 11:20, kendallnowell18
If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s
Answers: 1
The J/ψ meson, discovered in 1974, was measured to have an average mass of mav =3100 MeV/c2 (note th...
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