L> Physics Ch 12 Assignment answers Physics - chapter 12 Assignment AnswersCh 12 evaluation Answers: Newton assumed that a pressure must action on the Moon because, due to the fact that it moves in a curved (almost, yet not quite) circular path, it is accelerating. After ~ all, the direction of its velocity is constantly changing, and acceleration is the price velocity changes. An acceleration calls for a net pressure (2nd Law). The Moon (and every other planet satellite) is in cost-free fall toward the Earth, but it is a projectile whose tangential velocity keeps it from obtaining closer to the Earth. In the exact same time that the Moon drops a centimeter, the planet curves a centimeter out from under it! In order for a clinical hypothesis to development to the standing of a scientific theory, it should be thoroughly and also extensively tested. due to the fact that Fgrav = GMm/r2, the gravitational force is directly proportional come G. The little size of the gravitational continuous G tells you that the gravitational force is actually rather weak compared to various other known pressures like the electric, magnetic, and nuclear forces. You should know: (1) your mass, (2) the Earth"s mass, and also (3) the radius that the earth in bespeak to determine the gravitational force on you, which is her weight. The gravitational force is one inverse-square-law force - the strength of the pressure decreases v the square of the distance in between objects. In other words, double the distance means one-fourth that the force, three times the distance method one-ninth of the force, etc. (a) If you were five times farther indigenous the center of the planet than you are now, her weight would certainly be 1/25 ( = 1/52) of your existing weight. (b) If you to be ten time farther from the facility of the earth than you room now, her weight would certainly be 1/100 (= 1/102) that your present weight.Ch 12 Plug & Chug Answers: (Note that this is the same an outcome you would acquire from w = mg.)  (Comparing the answers because that this question and the last one, an alert that the gravitational pressure that the sunlight exerts ~ above the Moon is around 100 times as much as the gravitational pressure that the planet exerts ~ above the Moon. Why, then, walk the Moon orbit the Earth and not the Sun? ) Ch 12 Think & explain Answers: No, this brand is not reason for alarm! The same thing can be said about every object in the universe - consisting of you! The exact same amount that force. The pressures "Earth traction Moon" and "Moon traction Earth" space a Newton"s 3rd Law action/reaction pair. 500 N toward the center of the Earth. This gravitational pressure is the pressure we frequently call her weight. If the gravitational force of the sunlight on the planets all of sudden disappeared, they would move off with the velocity that they had at that instant (Newton"s first Law). So, they would move in a straight line tangent to their orbit, at consistent speed. (a) Yes, if the Moon were twice as massive, the gravitational force of the earth on the Moon would be twice as much, because the gravitational pressure is proportional come both masses involved. (b) Yes, the gravitational force that the Moon exerts on the planet would double also (according come Newton"s 3rd Law). A rocket going indigenous the planet to the Moon would certainly require an ext fuel. Due to the fact that the earth has more mass than the Moon, the planet will exert a bigger gravitational pressure on the rocket 보다 the Moon would certainly (things weigh much less on the Moon). This way that the rocket would have to exert a larger force to balance its weight leaving the planet than leaving the Moon. Because the rocket exerts a larger pressure leaving the Earth, it need to do an ext work to leaving the Earth, which takes an ext energy (in the kind of chemistry potential power stored in the rocket fuel). Gravitational pressures on a galaxy close to the "edge" that the Universe. (Not all forces are shown.) Net force on a galaxy close to the "edge" of the Universe. The monitoring that the development of the world is slowing down is regular with the legislation of gravity. Every thing in the universe attracts every various other object in the Universe through a gravitational force. The diagram on the left over shows few of the gravitational forces on a galaxy near the "edge" the the universe. Looking at the diagram you have the right to see that all of the forces on this galaxy allude "inward", because all gravitational pressures are attractive. This means that the net force on this galaxy point out "inward" towards the "center" the the Universe, as presented in the diagram at best above. So, if the galaxy is relocating away native the "center" that the universe (an widening universe), climate the net pressure on the galaxy will certainly act to slow the galaxy down, and the development of the Universe need to be slowing down. However, recent observations (since the publishing of your text) it seems to be ~ to suggest that the growth of the world is in truth NOT slowing under - in fact, the Universe seems to be accelerating. This is contradictory to the actions that the legislation of gravity predicts as described above. This is an area of an extremely heated and also intense research and also discussion at the moment. If the Universe"s growth is really speeding up, climate there has to be part previously-undetected pressure that is driving it. What can that force be?

## Ch 12 Think & resolve Answers

If the Earth"s diameter doubled and its mass also doubled, your weight would certainly be fifty percent as lot as now. Her weight is the gravitational force between you and also the Earth. Doubling the massive of the planet would twin your weight, due to the fact that gravitational force is straight proportional come mass, but doubling the radius (which doubles if the diameter doubles) would decrease your weight by a element of 1/4, because gravitational pressure is inversely proportional come the square the the radius.

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Mathematically: If friend were twice as far from the center of the planet as you room now, your weight would certainly be 1/4 of its current value (See #32).