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Basic: NLM ground frame doubt

I had a doubt while solving this problem. I'm making some mistake while doing this from the ground frame. Can someone solve this from the ground frame and send so that I can check? Thanks!
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Solutions

mera 50 aa raha hai but answer 40 hai
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Chem Bonding

Aise Questions kaise tackle karte hai??
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remainder

shortest method fir this
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Rotational motion, relative angular momentum

p = -1/4 and n = 1/3. But when we take angular momentum of A w.r.t. B, why don't we also take relative velocity (v of a w.r.t b)? We take relative position clearly, but not relative velocity?...
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Ray optics, silvering of lens sign convention

I've attached the solution's sign convention method attached. But why is this the case?
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Ray optics, lens maker's formula with different medium on either side

What do we take as relative refractive index? Why is the solution taking it as air for all 3 lenses?
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neck pain soln?

im having serious neck pain back pain and head ache from all three neck pain is worst headache i know will go back pain its gonna stay thers a reason cant do there but the neck pain oh god u gotaa help there and the muscle near the neck also hurts a lot

shape vs geometry

ques asked for linear GEOMETRY but ig ans is acc to linear SHAPE
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str.

Idk how to make the str of this, basically i'm confused at -(CHOH)3- part
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MEC Geometry

in solnt it says that angle is Pi + 2Theta How?
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Polarisation

why is b incorrect at 90deg second polariser will be horizontal and first one is vertical so it will cancel all light and I = 0
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Maximum Height of a Ballistic Pendulum

Consider the given ballistic pendulum. For the given setup, no torque is present on the sphere w.r.t the center of the sphere, so shouldn't the rotational component of K.E. be zero?
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chiral compounds

ok i do not understand even a bit what chiral compounds are can someone explain...

why this?

why does the third has the answer as br on 1st carbon shouldnt it be 2nd cuz of markonikov rule?
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work done by external agent?

solved the qn but whats the work done by external agent?
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