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By considering Newton's second law and his law of gravitation, derive an expression for gravitational field strength g in terms of its mass, m, the distance from its center of mass, r, and the gravitational constant, G.

Newton's second law of motion is F = ma and his law of gravitation is F= GMm/r^2.g is the acceleration of free fall and can be substituted for a, F = mg.We can therefore see that g = F/m and can use that to ...
RM
Answered by River M. • Physics tutor
2414 Views

What's the difference between inertial and gravitational mass?

Like charges repel and different charges attract, i.e. charges feel an electromagnetic (EM) force. Electrons (fundamental particles that 'orbit' around the nuclei of atoms) carry a negative charge of -1.6 10...
YB
Answered by Yassine B. • Physics tutor
2496 Views

How and why does a geostationary satellite stay above the same point on the Earths surface?

First I think it is useful to look at the definition of a geostationary satellite to find out why it appears to stay in the same place above the earths surface. It is an object that is above the equator, has...
TS
Answered by Tim S. • Physics tutor
2870 Views

What is the gravitational force between two steel spheres of radius 10 meters and density 8000 kilograms per meter cubed

Use Newton's Law of Gravitation and treat steel balls as point masses.You will get 187 Newtons.
RS
Answered by Rajan S. • Physics tutor
2196 Views

Calculate the time taken for 1000L of water at rtp to be heated to 40degrees celsius using a 40kW heater

First the starting parameters of the fluid should be calculated, so at rtp the density of water is 1kg/L therefore mass is 1000kg and the temperature is 20 degrees C. The next step would be to plug these val...
CA
Answered by Cameron A. • Physics tutor
3321 Views