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There should be at least as many simultaneous equations as there are unknown variables - or else you cannot get a numerical answer! Start by trying to eliminate one of the variables. You can multiply the ...

As his hand moves back with the ball, the time taken to stop the ball is greater. This means that the rate of change of momentum is less (because the rate of him changing the speed of the ball is much slo...

The example I will use is the UK. One strategy the government has used is to increase the retirement age so people are working longer.  Males and females now have an equal retirement age of 65 and it will...

Newton's First Law states that an object will continue moving at the same velocity in the same direction unless a resultant force acts upon it. This applies to stationary objects too - if an object is sti...

An impermeable membrane is one through which no substance can pass. Semipermeable membranes are those which only let solvents, such as water, pass through them. Permeable membranes are those which let sol...