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An elastic wire suspended from a workbench has a 2kg mass attached to its free end. The wire changes in length by 2cm. Calculate the elastic potential energy stored in the wire.

Using Hooke's law (F = k * e) we can find the spring constant. Rearranging for k, we find that k = (9.81 * 2)/0.02 = 981 N/m. To calculate this we needed to find the force acting on the wire (F = mg) and als...
JG
Answered by James G. • Physics tutor
2300 Views

What is an atom?

It is composed of Protons, Neutrons and Electrons. The Proton is positively charged and is present in the central nucleus part of the atom.The Neutron has no charge and also is present in the nucleusThe Elec...
SB
Answered by Sam B. • Physics tutor
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How high can you raise a kilogram of sugar with 1 kWh of electrical energy? (To 2 s.f in kilometres)

The first thing to recognise is that the terms 'sugar' and 'electrical' are there to confuse you - the substance raised and the type of form of energy used to raise it are not important to the question. This...
AL
Answered by Alexander L. • Physics tutor
3576 Views

Explain what is meant by “terminal velocity” with regards to falling objects.

Terminal velocity is the maximum velocity (a vector quantity that accounts for speed and direction) that can be attained by a falling object of a certain surface area. Objects accelerate downwards due to the...
RJ
Answered by Rachel J. • Physics tutor
5146 Views

How do stars form?

stars begin as a giant cloud of gas which is also a protostar. gravity will pull the gas in on intelf which increases heat and pressure to such great quantities that nuclear fusion can begin. hydrogen is the...
DC
Answered by Dhiren C. • Physics tutor
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