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Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
23,746 questions
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Engineering mechanics basic question? [closed]
Thdbsvdbfbtjjrjfhrhhrhrhr zvzbdbdbdbdbdbdbdbdvdvdvdvrgrg wtgegdgdg egegege rbdbdg egegdgd egddvr rvdgdg gegdvs egeg
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About friction in Problem 1.14 from Morin's Classical Mechanics Problem book [closed]
The problem is as followed:
I wanna try to approach this problem using a mix of free-body diagram and torque balancing. But I think I mix up the forces somewhere. Here is my attempt at drawing the ...
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Newtons' laws of Motion [closed]
Normal contact force, consideration of 3d figure, all the force is directed along the centroid of pyramid formed by joining the centres. The mass of each ball is M and side is a, find the normal ...
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$Q$-value of $\rm{}^7Li + p \rightarrow {}^7Be + n$ [closed]
Ive calculated this $Q$-value, and I find
$$ Q = (7.016003 + 1.007825 - 1.00866 - 7.016928)\times 931.5 \rm\, MeV$$ and then $$Q = -1.649\rm\ MeV.$$ But the solution manual from Krane says $Q = -1.644 ...
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Work done by a body in a relative motion
I was working on the problem detailed below and found a "contradiction" between the required force balance condition and the virtual work method. I believe the resolution requires a more ...
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Does magnetic field vary when frame of reference changes?
This question comes from a photo of my homework. There is a light stick with two balls on both side. I've balanced the weight of them so they could rotate freely around the point O. The ball on the ...
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Can someone help me solve this exam question from the past? [closed]
The beam is connected by a hinge at point C to a rigid wall and is supported at point B by a rigid structure BD. The structure BD is connected to the beam ABC at point B by means of a pin connection ...
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How much kinetic energy does a car absorb in my instance? [closed]
So pretty much, I’m trying to figure out how much energy an occupant absorbed in a car crash in this specific instance. It’s from a TV show, not real life.
I am stuck on one thing: the energy a car ...
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One-Loop Integral Analytical Solution with Feynman Parametrization [closed]
For this one loop integral, I have approached it using Feynman Parametrization,
$$\int_{}^{}\frac{d^{d}k}{(2\pi)^{d}}\frac{1}{(k^{2}+m_{1}^{2})[(k-q)^{2}+m_{2}^{2}]}$$
The parametric integral that I ...
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How to intuitively solve this problem? [closed]
Intro: I am not a master of physics and i would love for a person who is better than me at it give me some insights.
Problem:
There are three uncharged metallic balls of radii $a$, $b$, $a$ ...
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Is my approach fine and which value of time $T$ I should choose? [closed]
A ball is thrown vertically up with an initial velocity of $u$ metres per sec. Also if it known that, the Max height it reaches is $H$ metres in $T$ seconds, Find $T$ in terms of $u$ and $H$. Take $g=...
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A Rolling Disk with a small ball soldered on its rim [closed]
A disk of mass M and radius R is constrained to roll, without slipping (pure rolling), on a horizontal plane. On its rim (inward), a small ball of mass m is soldered, whose dimensions are negligible. ...
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5
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Heat exchanged in a isothermal process
Why aren't heat exchanged and change in internal energy both equal to zero in isothermal process ?
My approach-
$\begin{aligned} & \Delta U=n C_V \Delta T \\ & Q=n C \Delta T\end{aligned}$
...
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Does Faraday Cage also work in a changing electric field?
My question comes from a example in my textbook (see the photo). It illustrates a Linear Accelerator used to accelerate electronics. The voltage between the metal "tubes" will change ...
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Does high thermal conductivity means low heat absorption?
I read in my book that if the thermal conductivity is very high the body (black body) won't absorb any heat. Why is that?
Higher thermal conductivity just means it conducts heat better right, then how ...
