ORIGINS 2B03 Lecture 14: Lecture 14

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turquoiseant391

9 Feb 2012

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Matter tells spacetime how to curve, spacetime tells matter how to move along with light. Needed to explain small scales in perspective to big things. Differential gravity (tides are caused by tidal force) Stronger gravitational forces on things closer to the mass. The moon pulls the water from the earth causing tides. In real gravitational fields the acceleration is not exactly constant. The difference between a star and planet is nuclear fusion (not larger than 13x the size of jupiter) Special class of objects that burn deuterium are called brown dwarf. Basically extra-solar planets need to be in orbit around a star and not be burning hydrogen (or any nuclear fusion) Finding planets around other stars is very difficult - stars are big and very bright and their planets are small and very dim. Transit method: watch a given star very patiently and continuously. If one of its planets go in front of it, it gets dimmer.

Related Questions

What evidence supports the predicted existence of gravitational waves?

(a) Gravitational waves are frequently and easily detected by large telescopes.

(b) The energy generated by gravitational waves from the sun can be seen as it is absorbed by Jupiter.

(d) The orbit of a star system consisting of two neutron stars is slowly decaying, suggesting that energy is being carried away by gravitational waves.

(e) Photographs of spacetime show the gravitational waves as ripples that are clearly visible.

sangriaminnow940

Every few months, memes circulate claiming that certain alignments of the planets with the Earth will result in a change in the gravitational force you feel. Usually, these memes state that the alignment will counteract Earth's gravity slightly so you will less of a gravitational pull towards the Earth.

Can this ever happen? Let's look at the numbers.

What is the gravitational force (in N) of the Earth on you ? Say your mass is . (Enter the magnitude.)

What is the gravitational force (in N) of Jupiter on you when it is closest to Earth ? (Enter the magnitude.)

By what factor the mass of Jupiter needs to increase to be equal to the gravitational force you fell the Earth?

The gravitational force between two masses is given by

where

We can use this expression to determine the magnitude of the gravitational force you feel while on the surface of the Earth.

viridianmanatee482

Out of the following which factor is responsible for the formation of tides in the ocean?

(a) Due to the rotation of the earth.

(b) Due to the gravitational force of the earth.

(d) Due to the difference in the gravity pull of the moon across the earth.

ORIGINS 2B03 Lecture 14: Lecture 14

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