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In our universe the rest energy of an electron is approximately$8.2 \times 10^{-14} \mathrm{J}$ . What would it be in the alternate universe?A. $8.2 \times 10^{-8} \mathrm{J}$B. $8.2 \times 10^{-26} \mathrm{J}$C. $8.2 \times 10^{-2} \mathrm{J}$D. 0.82 $\mathrm{J}$

$$=8.2 \times 10^{-26} \mathrm{J}$$

Physics 101 Mechanics

Chapter 27

Relativity

Gravitation

Cornell University

Rutgers, The State University of New Jersey

McMaster University

Lectures

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In physics, orbital motion is the motion of an object around another object, which is often a star or planet. Orbital motion is affected by the gravity of the central object, as well as by the resistance of deep space (which is negligible at the distances of most orbits in the Solar System).

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Sir Isaac Newton described the law of universal gravitation in his work "Philosophiæ Naturalis Principia Mathematica" (1687). The law states that every point mass attracts every single other point mass by a force pointing along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance between them.

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So in this problem, we know that the rests energy for the electron in our universe is, let's see, uh, 8.2 8.2 time stand to the minus 14. Jos Chow's. OK, so this is the rest energy for the electoral in order universe. And we want to calculate for the alternate universe. So if we make a proportion here, we can say that the energy in the alternate universe divided by energy in our universe is MM. See off the alternate universes Square divided by M. C. Square in our universe so we can cross the mess because the mass doesn't change. And we can say that the energy in the alternate universe it's just going to be, uh, the energy in our universe See, of the alternate Universes Square divided by C Square. So we know that the speed of light in the alternate universe history 100 meters per second, so we can calculate this should be 8.2 times 10 to the minus 14. They're multiplies 300 square, divided by the speed of light. In our universe is square, which is nine time stand to the power of 16. So the energy the rest energy. In the alternate universe, it is just 8.2 times 10 to the power of minus 26 Joe's. So the correct answer to this question is alternative B. And that's the final answer. Thanks for watching.

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