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This question is asking about forces acting around a pivot point, so we can use the formula for the moment M = F*D about the pivot point. The clockwise and anticlockwise moments around the pivot must be e...

While on the Earth's surface, you need to put in energy to move upwards, due to the force of gravity from the Earth's mass acting on you - eg jumping upwards requires energy.
The force of gravity is ...

Our object will have a combination of potential energy (due to it's position relative to the ground) and kinetic energy (due to it's velocity).Consider the potential energy first. It depends on the height...

Both gravitational and electric field obey inverse square laws (e.g. F(grav)=GMm/r^2 and F(electric)=kq1q2/r^2 where GMm and kq1q2 are constants). They both act between two bodies without any means of con...

In the Young double slit experiment, coherent light of wavelength λ from a single source illuminates a system of two slits separated from each other by a small distance a. Each slit causes the light enter...