The shape and size of a nucleus can best be described as

a. A perfect sphere of diameter 0.4 nm.
b. A perfect sphere of diameter 4 x 10-18 m.
c. A roughly spherical shape of diameter 4 x 10-18 m.
d. A roughly spherical shape of diameter 4 fm.


e. this is about the right size and description.

Physics & Space Science

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The metal in a chunk of copper or iron is composed of

A) crystals. B) non-crystalline fibers. C) amorphous particles. D) none of the above

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One possible way that future scientists may determine whether the core-accretion model or the gravitational instability theory better explains the formation of the jovian planet is:

A) measuring the mass of the rocky material in the jovian planets' cores. B) measuring the metallic hydrogen layer in the jovian planets. C) observing the changes in the rings around the jovian planets. D) observing the changes in the magnetic fields of the jovian planets.

Physics & Space Science

What is the critical temperature for stage 7; why?

What will be an ideal response?

Physics & Space Science

What would be the weight of a 59.1-kg astronaut on a planet twice as massive as Earth and having twice Earth's radius?

A) 580 N B) 290 N C) 1160 N D) 118 N E) 1200 N

Physics & Space Science