WHAT WILL BE THE EFFECT ON THE SHAPE OF EARTH, IF GRAVITY STARTS ACTING IN UPWARD DIRECTION????

 

PLEASE CLEARLY EXPLAIN  AS WELL.

TO ALL MY FRIENDS, AT LEAST THINK OVER IT.

 

AND DO SUBMIT YOUR ANSWERS WHATSOEVER IT MAY BE!

 

LOOK, WE ALL ARE HERE TO IMPROVE ,SO ITS A CHANCE FOR US TO IMPROVE AND LET OTHERS IMPROVE;RIGHT!!

 

KEEP

HEY DAER GRAVITATION IS AN ATTRACTING FORCE

SO HOW CAN IT ACT IN POPPOSITE DIRECTION ON PPL LIKE US (SMALL) AND IF A HUGE BODY IS THERE THEN IT WILL ATTRACT EARTH BUT CAN NEVER REPEL

 Before answering ur ?ion, let's go back to the definition of gravity. It is the resultant gravitational force which the earth exerts on any other mass in it grav. field. So, as it can be infered from the question, the net force of gravitation of the earth has changed from attractive to repulsive. This means that the force due to each particle constituting the earth will be repulsive .

         Now, let us consider a diametrical line starting from the top of the earth (in diagram), passing through the centre and ending at the bottom. On this line, we consider a small particle of mass dm, at a depth h which is obviously less than radius of the earth (the depth of any particle except the centre is < R). So, dm divides the strip into 2 unequal lengths and hence two unequal masses. So, the greater mass will repel dm in one direction with a greater force while the lesser mass will repel dm in the opposite direction with a lesser force. It can be shown that when the forces due to all d particles of the earth are considered, then the total resultant force on dm  is in the direction of the force exerted by the greater length of the initially considered line. Hence the particle will experience a net force in this direction. The effect will be more pronounced when the particle will be close to d surface. So, the paritcles on the surface will be repelled and thrown away in outwatd direction. After this layer is eliminated, the next layer becomes the surface- layer and undergoes the same process. The entire process will take a very short time (it will take place in the form of a explosion) and the earth will cease to exist. The speed of elimination of the layers will gradually decrease as they get closer and closer to the centre. At last, the centre will be left behind.

hi!!  pratikeesh,

   

      So good of you , that you explained your thougths very well. you have a clear picture of what is going to happen, but, i think there's a point which  i didn't understand------------  the resulant force becoming compleatly repulsive, and resulting in the disintegration of earth.how can it happen ;

 

have your eyes through this,

      

      when the gravity changes its direction , it got to be ,pulling earth outward,  resulting in an elliptical shape, which would in turn tend the earth to move   around the sun in a parabolic path , may be , the days  get considerably longer  at the equator(which would surely expand) and at the poles the day period may decrease to a few hours.....

      the earth will not disintegrate but will start revolving faster and a year may as well decrease......

     applying your concept of resulting force acting on the body due to each particle(of mass dm)and the truth that magnitude of gravity depends on the centre of mass,i think ,the earth will have a decreased force of gravity and , the atmosphere will leave the earth .....but surely the earth will not disintegrate(as still the net force will be inwards)...

      i agree with "Sharkirshafi12 and Chimansu_007" on their answers of earth becoming elliptical,but , guys , you need to explain that as well.......

      the earth will  become elliptical as the gravity will try to expand it outwards, but , how can , earth leave  its natural tendency(due to the mass it posses) of getting the minimum surface area , i.e, becoming a sphere,but all this will only result in an elliptical shape , with the centre of mass doing a simple harmonic motion horizontally...........(wierd , unbelievable, totaly rubbish whatever you think, but , when we think of something so wierd , then the results are  ougth to be wierd).

      its been fun racking my brain over this , after all , we are the future engineers, isn't it...so. everything wierd is worth a thougth......................

      lets see , what are great , experts (sir , please guide us through)have to say........

     

keep smiling...........................................

 

 

   

(<the thinking is good>) - but if so happens there should be no atmosphere because all constituting gases will escapes out.

            2> when gravity acts outward

( This is repulsive force)             (this is attractive)

           so