At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10^?15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10^?25 kg.)


3 500 N

Physics & Space Science

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The law of poles states that like magnetic poles ______________ and unlike magnetic poles ______________

Fill in the blank(s) with correct word

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Which of the following best sums up current scientific thinking about the nature of dark energy?

A) Dark energy most likely consists of a form of photons that we can't see or detect. B) Dark energy is most likely made up of weakly interacting particles that do not interact with light. C) Dark energy probably exists, but we have little (if any) idea what it is. D) Dark energy is the source of the mind weapon used by Sith Lords in Star Wars.

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How would you search for Kuiper belt objects? What features would you include in a systematic search for Kuiper belt objects — where in the sky would you look, and in which wavelength regime? What features would you look for in images? What other

types of objects might you accidentally find, as well?

Physics & Space Science

What happens to the surface temperature and luminosity when a protostar undergoes convective contraction?

A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.

Physics & Space Science