From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below
A) the green ball will be moving faster than the blue ball.
B) the blue ball will be moving faster than the green ball.
C) the two balls will have the same speed.
C
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Use the conservation laws to identify the missing particle in each of the following reactions. (a) ?? + p —> ?+ + __________. (b) ?+ —> ?? + _________. (c) p + p —> p + ?+ + ___________
Fill in the blank(s) with correct word
The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?
A) It slowly works its way to the Sun's surface, where it escapes into space. B) It rapidly escapes from the Sun, traveling into space at nearly the speed of light. C) It almost immediately annihilates with an electron, resulting in two gamma-ray photons. D) It quickly meets an ordinary electron, forming an electron-positron pair that remains stable. E) It joins with a nearby neutron to form a proton.
Stars on the main sequence with the greatest mass
a. are spectral type M stars. b. are spectral type O stars. c. are located at the bottom of the main sequence in the HR diagram. d. have masses very similar to the sun. e. both b and c
If two electrons in an atom have the same energy, then they must have the same four quantum numbers
A) True B) False C) They cannot both have the same energy.