What direct evidence do we have that the weak and electromagnetic forces were once unified as a single electroweak force?
A) The most advanced telescopes are able to see back to this era in the universe.
B) Detectors on Earth have received photons and high-energy particles from this era.
C) Temperatures in the center of the Sun can reproduce the conditions during this era.
D) Particle accelerators on Earth can recreate the conditions of this era and have produced particles predicted by the electroweak theory.
E) We have no direct evidence of the electroweak force.
D) Particle accelerators on Earth can recreate the conditions of this era and have produced particles predicted by the electroweak theory.
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The expansion of a star to giant or supergiant size _____, and so the stars move toward the upper right in the Hertzsprung-Russell (H-R) diagram
A) contracts the star drastically B) cools the star's outer layers C) dims the star D) makes the star less luminous
The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?
?
?
A. 1.8 m/s2 B. 2.6 m/s2 C. 1.4 m/s2 D. 2.2 m/s2 E. 3.7 m/s2
Triple the mass of the bob on a simple pendulum will cause a change in the frequency of the pendulum swing by what factor?
a. 1/3 b. 1 c. 32 d. 3 e. 1/32
Alpha decay occurs in some radioactive nuclides with A > 150. The probability of an alpha particle being emitted depends on the energy of the alpha particle. Why is this so?