resistance of a metal wire of length 1m is 26 ohm at 20 column if diameter of a wire is a 0.3 millimetre what will be the resistivity of the metal at the temperature using a table 12.2 period the material of a wire
Answers
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The kinetic energy possessed by a moving body is equal to the amount of work done which a moving body can do before coming to rest.
Suppose a body of mass m is moving with a constant velocity v. It is brought to rest by applying a constant opposing force F. Let a be the uniform retardation produced by the opposing force and the body travels a distance S before coming to rest. Then,
F=ma........... (1)
K=F×S.......... (2)
Now to calculate displacement S, we have
initial velocity (u) =v,
final velocity (v) =0
Since a is the retardation, so acceleration= –a
From relation
Substituting the values of F and S from equation (1) and (3) in equation (2) we get
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