In superstring theory the fundamental objects from which all forces and matter are built are:

a. Planck lengths.
b. gravitons.
c. gluons whose size of about 10^-25 m is the smallest distances in nature.
d. loops of material that cannot be further subdivided, whose size of about 10^-35 m is the smallest distance in nature.
e. quarks whose size of about 10^-25 m is the smallest distance in nature.


d

Physics & Space Science

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The gravitational force in a molecular cloud depends on

A) density only. B) temperature only. C) density and temperature. D) composition. E) thermal pressure.

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Give three examples of the equilibrium rule that are not cited in the textbook

Fill in the blank with correct word.

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Both RR Lyrae and Cepheid variables are giants that ________ in size over time

Fill in the blank(s) with correct word

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A particle (m = 20 mg, q = ?5.0 ?C) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 25 m/s in the positive x direction and is passing through the origin. How far is the particle from the origin at t = 2.0 s?

a. 80 m b. 20 m c. 58 m d. 10 m e. 30 m

Physics & Space Science