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If Newton's 3rd law is true (all actions have an equal and opposite reaction), then how can any object move?

(Using diagrams to aid explention)This is a common difficulty students with Newton's third law, because in isolation it makes sense; If i am pushing a cart, and the cart imparts an equal amount of force on m...
JW
Answered by James W. • Physics tutor
1916 Views

Briefly outline how a skydiver reaches terminal velocity.

This question is relating to the balancing of forces on a moving object. The force on the skydiver will be equal to its weight multiplied by its acceleration (the acceleration will be equal to 9.8m/s/s - acc...
WB
Answered by William B. • Physics tutor
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Calculate how much charge flows through a circuit with 6.0A of current in seven minutes?

It is important to understand that Q=It and therefore by rearranging the equation we know that 1 amp means one coulomb of charge passing through a point every second in the circuit. Therefore we multiply our...
IP
Answered by Ishaan P. • Physics tutor
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A cart starts at rest and moves freely down a ramp without friction or air resistance and descends 8 meters vertically, what is its speed at the bottom?

We apply energy conservation. At the start the cart has only gravitational potential energy given by mgh where m is its mass, g is the gravitational field, h = 8m is the height. At the end the cart has only ...
JT
Answered by Joshua T. • Physics tutor
1761 Views

Calculate the charge that flows past a point in a circuit with a 5.0A current for five minutes.

A coulomb the amount of charge that passes in 1 second when the current is 1 ampere.Q = It t = 5 x 60 = 300 (s) we must use Si units in physics hence the conversion to seconds here. Q = 5 x 300 Q = 1500 (C)
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Answered by Steffan T. • Physics tutor
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