They say that a rotating knife thrown is more dangerous than a knife thrown straight
I find it weird
If the knife is rotating, it will experience more air drag than if thrown straight which will also depend on plane of rotation(For some reason, I don't know, it experiences more drag if...
What I do not get is why should a stress much lower than yield point cause deformation in a material?
If temperature is high intermolecular attraction is reduced and thus even low stress can deform things.
But if it is low
Then a force lower than yield point should be less than intermolecular...
This was the question
(The line below is probably some translation of upper line in different language)
For disc it was ma^2/2
For ring it was ma^2
For square lamina it was 2ma^2/3
For rods
It was different
Please explain
Thank Youπ
I tried to solve it by integrating force from 0 to L
dF=dm.g
where dm=Ξ»dx
And then I multiplied it with velocity to get power because velocity is constant
β«(vdF)=v β«(dF)
But the book used integration to find work done and divided it by time for power
My answer was Ξ»lgv(Option B)
Giving...
When a ball is thrown such that it moves in a curved trajectory in the horizontal plane, it amuses me to think of its dynamics.
In motion of a ball thrown upwards the force of gravity gives it a parabolic trajectory
However when the ball is thrown to curve and hit a target, (in the horizontal...
I have read that an electron requires certain minimum energy of threshold frequency to move an orbit
However the energy needed decreases with increase in shell number
The transition energy is reduced with each orbit
For example
The energy to shift an electron from 1st to 2nd orbit is much...
I think the equations should be
πβπ2π=π2π1
π3πβπ=π3π1
π1βπ1π=π1π2
2πβπ1=(π2+π3)π2
P.S.- My textbook assumes T1 = 2T.
I don't understand why that is so.