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Physics
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Can you please explain the basics of electricity? I can do the maths but I don't understand what 'voltage', 'current' or 'resistance' actually is!

The fundamental unit of electricity is 'charge'. Each electron is slightly negatively charged and it is this movement of charge around a circuit which powers our appliances. The speed of the electrons/the...

Answered by Alex M. Physics tutor
2748 Views

What are Newton's Laws of Motion?

Newtons First Law:An object at rest will stay at rest, and an object in motion will stay in constant motion unless acted upon by a resultant force
Newtons Second Law:F=ma
Newtons Third Law:If o...

Answered by Husein A. Physics tutor
1563 Views

State and derive Kepler's third law

Kepler's third law states that the square of the period of any planet is proportional to the cube of its orbital radius.To derive it, two equations are required: F=GMm/r^2 and F = mv^2/r. These are Newton...

Answered by Samuel B. Physics tutor
2155 Views

Can you explain the photoelectric effect?

The photoelectric effect is one of the first pieces of experimental evidence of quantum mechanical phenomena. It describes how a material absorbs light and result in emission of electrons. Using a classic...

Answered by Anthony H. Physics tutor
1541 Views

A jug containing 0.250 kg of liquid is put into a refrigerator. Its temperature decreased from 20°C to 15°C. The amount of energy transferred from the liquid was 5,250 J. Calculate the specific heat capacity of the liquid.

Using the equation Q = mcT, where Q represents energy in Joules, m represents mass in kg, c represents specific heat capacity measure in joules kg-1 K-1 and lastly, T represents the ...

Answered by Andrew S. Physics tutor
2168 Views

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