An electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass. This pair annihilation is an example of
a. time dilation
b. length contraction
c. the equivalence of mass and energy
d. the principle of relativity
e. none of the above
C
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A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 ×10-26 kg,
and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many molecules strike the umbrella each second? Assume that the wind blows horizontally so that the gravitational force exerted on the air molecules can be neglected.
The Sun remains stable because the inward pull of ______________ balances the outward push from nuclear fusion
Fill in the blank(s) with correct word
What do we mean by a "super Earth"?
A) a planet made of metal and rock that is larger in mass than Earth B) a planet that is more massive than Earth and also has surface oceans C) a planet with an Earth-like orbit that has more abundant life than Earth D) a planet similar in size to Earth but orbiting close to its star
In the two-slit experiment, monochromatic light of wavelength 600 nm passes through a pair of slits separated by 2.20 x 10-5 m
(a) What is the angle corresponding to the first bright fringe? (b) What is the angle corresponding to the second dark fringe?