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what would be the mass required to keep an object with a mass of 250kg orbiting at a constant distance of 100km with a linear velocity of 100m/s?

the linear speed of an orbiting body is given by the equation sqrt(GM/2r) where M is the mass of the attracting body, G is the gravitational constant and r is the distance between the two bodies' centres of ...
MA
Answered by Michael A. • Physics tutor
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What is the Young's modulus of a material?

The Young's modulus is a measure of the stiffness of the material - higher the young's modulus, higher the stiffness. It is calculated by dividing stress by strain over the elastic deformation region and is ...
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Answered by Manika S. • Physics tutor
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Ignoring air resistance, use an energy argument to find the speed of a ball when it hits the ground if it is dropped from 50m, where m is the mass of the ball.

Original energy: GPE=50 9.81 m KE=0 Final energy: GPE=0 KE=(1/2)mv 2 Therefore (1/2)mv 2 = 50 m 9.81 . The m cancels and simplifying the equation we are left with v 2 = 50 2 9.81, therefore v = 31 ms -1
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Answered by Zach T. • Physics tutor
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If f(x)= ln(x^2)-4, give f^-1(x)

For this question we would start by making f(x)=y. As we know the laws of logs, we can say that ln(x 2 )=2ln(x), therefore our equation can now be written as y= 2ln(x) - 4 . From this point, we want to make ...
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Answered by Zach T. • Physics tutor
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Explain how bright fringes arise in Young's double slit experiment

To answer this question, we need to think about 3 things: interference, phase and path difference In the experiment, we have monochromatic light (from a laser) going through two slits and then bright and dar...
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Answered by Harveer M. • Physics tutor
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