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A boy with a mass of 50kg is sitting on a seesaw. He is sitting 2m from the pivot. He has a friend who weighs 40kg, how far away from the pivot must she sit to balance the seesaw? (gravitational accelleration (g) = 10m/s2)

This is a question relating to turning forces, known as moments . For the seesaw to be balanced the moment caused by the 50kg boy must be equal and opposite to the moment caused by the 40kg girl. A moment is...
SG
Answered by Sam G. • Physics tutor
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What is cosmic microwave background, and where does it come from?

Cosmic microwave background is a very faint level of microwave radiation filling all of space, and coming from all directions. The cosmic microwave background is useful to physicists as it provides the best ...
MR
Answered by Matthew R. • Physics tutor
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calaculate the resistance if two 3 ohm resitsors are placed in series and another 3 ohm was attached in parallel

total resistance for resistors in series is the addition of the resistances therefore the two 3 ohm resisters in series totals 6 ohms resistors in parallel follow the equation : 1/R T = 1/R 1 + 1/R 2 therefo...
BA
Answered by Brandon A. • Physics tutor
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What is the difference between velocity and speed?

Both the speed and the velocity show us how fast something is moving (the rate at which it changes its position). However, velocity is a vector quantity, which means it also gives us information about the di...
BS
Answered by Bozhidara S. • Physics tutor
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Describe how you could find the density of a cube of metal? (4 marks) (Example from GCSE bitesize)

Think of key words in the questions to help solve it. For example in this question we need to consider density and the fact that the object is a cube. 2) Remember the equation of density which is : Density =...
BA
Answered by Branwen A. • Physics tutor
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