Problem 1.101 Having gone through a plank of thickness ℎ, a bullet changed its velocity from ?_0 to ?. Find the time of motion of the bullet in the plank, assuming the resistance force to be proportional to the square of the velocity.
Problem 5.15 IE IRODOV
Problem 5.15
At what value of the angle of incident ?_1 is a shaft of light reflected from the surface of water perpendicular to the refracted shaft?
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Problem 1.69 IE IRODOV
Problem 1.69
A bar of mass m resting on a smooth horizontal plane starts moving due to the force ?=??/3 of constant magnitude. In the process of its rectilinear motion the angle ? between the direction of this force and the horizontal varies ?=??, where ? is a constant, and ? is the distance traversed by the bar from its initial position. Find the velocity of the bar as a function of the angle ?.
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Temperature Dependence of Resistivity & Resistance
Thermistor
Superconductors
Finding Coefficient of Resistance
We have seen in the drift velocity lecture
? ⃗=(??^2)/? ?? ⃗
? ⃗=?? ⃗
?=(??^2)/? ?
When we increase temperature of conductor average time between two collision(Relaxation time) will decrease so conductivity will decrease and as a result resistivity will increase.
For small temperature variations we can write for most of the materials
?_2=?_1 (1+?(?_2−?_1 ))
?_2=?_1 (1+?∆?)
Where ?_2 ??? ?_1 are the resistivity at temperature ?_2 ??? ?_1 respectively and ? is called temperature coefficient of resistivity.
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