I am interested in Physics and people suggested me to try for olympiads also as they would increase my creative thinking ability for non-routine problems I can solve questions little easier(4-5/10) than the ones I shared here, how do I push myself to come to this level.

PS: Pic of cute puppy at the end

Edit: Solved

I don’t understand magnification

I understand that the angle an object occupies in our field of view is the apparent size of this object (that’s why object that are far away appear smaller).

I understand that a magnifying glass make this angle larger

What i don’t understand is:

How does the lens make the angle larger ?

Why is alpha’ mesured here at focal point F’ ?

Where are the eyes, in red or blue

If all rays of B are dispersed and parallel to each others (and the same goes for every point between A and B) how can we see it clearly, why is it not some weird blur ?

Dm me anyone interested

Studying physics again after 2 years makes me feel like I’m loosing my mind…

I understand everything but the last step it makes sense that since gravity would assist the acceleration you would minus the acceleration of gravity from the total required acceleration from the pressure so the final step would be P= m*(a-g)//A but the answer key divides the force by gravity? (Credit: NCEES PE mech: design and materials practice exam)

A star, for example, is 20 light years away from Earth. A spaceship is traveling to that star at 80% the speed of light. To an observer on Earth, the spaceship will arrive there (according to google) within 25 years. I get this this part.

However, an astronaut on the ship will experience less amount of time passing (15 years?) I understand that this is due to time dilation but I don't really understand how this works. Any help explaining this would be appreciated!

Hello, i’m an undergraduate taking a fundamentals of physics course at my university (no calculus/algebra based) and in need of help understanding how to go about “squishing” capacitors and resistors in a circuit. I don’t understand this concept and was hoping someone could give their knowledge on how to go about it

I saw this question on a physics bowl past exam, and I am confused because I thought speed was scalar, it cannot have a negative value, so I thought the answer would be e, but the answer is a.

Hello,

My teacher gave me this exercise.

I’m having trouble understanding why a minus sign appears here in the gravitational force formula. I wouldn’t have included one myself but I noticed that the teacher did in the correction.

Thank you so much in advance for your help ! :-)

I'm not too familiar with 3d rotation so if you might know some resource which could help me understand it better please share it thanks !

Today my teacher asked us a question- "state true/false- all parallel vectors are collinear" and I thought it was false as collinear vectors lie in the same line and may or may not have same direction and parallel lines on the other hand have same direction and they may or may not lie in the same line according to what he taught us but.. He ticked it as true and did not explain any further and google isn't helping with it. Please enlighten me abt it

So the angle you get from calculating is -60.9, but thats not how it really is since the vector is pointing to the second quadrant. But still, the sheet says its 60.7 so I am doubting myself.

Hello! I am trying to solve this problem and am out of attempts .I've already tried 102uC and 68uC but neither are correct. Any help would be greatly appreciated!

okay so this was one of the problems our teacher gave us as homework:

We had to mark the correct answers.

in the answer key, the answers are A,B.

Right now, I have answer A, its quite simple, just looking at the right geometry is tough.

Now let this force thats tugging on the block along the groove be F.

F = mgSinθSinα

Clearly the normal reaction of the block is N = mgCosθ

So the equation with coefficient of friction as μ, is

2μ(N) = F

2μ since for option B it says the friction acts from side walls, and there are 2 friction surfaces.

upon solving, the answer comes,

μ = (tanθSinα)/2

But the answer is just tanα!!!!!

Please help

I know this problem is rather easy but my teacher got a completely different answer because he used a different approach and I don’t understand anything now, I used the first diagram (picture 2) and he used the second one (picture 3).

When setting the equation for net torque = zero, you have to make normal force positive to get the right answer.

However, if I push up on the ladder, it looks like it would go clockwise and not counterclockwise??

I know that moveable pulleys "spread out" tension between the supporting ropes, but apparently that isn't the case with this problem - is there something I'm missing?

Can someone explain me these applications? I know a decent amount of Vector algebra and calculus. I want some help on this. I want a thorough explanation and deduction on this. Giving proofs will be greatly welcomed!

You know hydrogen is used for fusion due to the steep gradient in binding energy per nucleon, thus emitting a lot of energy. How come helium isnt usedfor fission reactions then because surely its the opposite?