The discussion revolves around calculating the acceleration due to gravity on the surface of a planet with a specified mass and radius. Participants explore the implications of mass and gravitational force in this context.
There is an ongoing exploration of the relationship between gravitational force and acceleration. Some participants have offered hints and clarifications regarding the use of Newton's law of gravity, while others are attempting to reconcile their understanding of the variables involved.
Participants are working under the assumption that they need to apply Newton's Universal Law of Gravity, and there is a discussion about the relevance of the mass of the object in relation to the acceleration due to gravity.
You have the mass of the planet--that's all you need. Use the equation from your first post.cary5 said:Fg=G*m*m/r sqd
but that does not give me g and besids i need 2 masses for this
Doc Al said:You have the mass of the planet--that's all you need. Use the equation from your first post.
No. Write the force of gravity on some mass m as:cary5 said:Fnet/5*1o^23=a ?
now i have 2 varabls
Doc Al said:No. Write the force of gravity on some mass m as:
Fg = G*M*m/r^2
where M is the mass of the planet
The acceleration due to gravity is Fg/m.
Sounds good to me. So what's the acceleration due to gravity?cary5 said:Fg=(6.67*10^-11)(5.00*10^23)(m)/(3.00*10^7)^2
=0.037m
Doc Al said:Sounds good to me. So what's the acceleration due to gravity?
No. Go back to post #6. a = Fg/m (not Fg/M)cary5 said:0.037m/5.0*10^23
=(7.4*10^-26)m
cary5 said:What is the acceleration due to gravity on the surface of a planet with mass 5.00 x 1023 kg and radius 3.00 x 107 m? If you need to, suppose that a block of mass 50 kg is at rest on the surface. Why does it not matter what the mass of the block is?a= Fnet/massi don't know the Fnet
barthayn said:Acceleration due to gravity is the same as the force of gravity for a 1 kg mass. For example, Earth's acceleration due to gravity is 9.8 m/s/s while its force for a one kg mass is 9.8 N. From this you can assume the second mass needed is one kg.
This allows you to use Newton's Universal Law of Gravity to isolate for Fg. If you used the second mass of the object as one, it should be the same for the acceleration due to gravity on that planet.