Questions tagged [homework-and-exercises]
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.
23,688 questions
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Faraday's law of induction with a DC voltage source
I have taken an old exam problem and modified it via MS Paint to include a DC power source.
Let's assume the area vector of the loop points out of the page. In the original problem with no DC voltage ...
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In synchronotron, the required high magnetic fields are generated by ___________?
This question came in KEAM 2025 April 28. I have searched extensively, but cannot find an answer anywhere.
The options given were
A) Solenoid only
B) Electromagnet only
C) Toroid only
D) Solenoid and ...
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Double Mass Pendulum: Period of Small Oscillations and Velocity After Detachment [closed]
A pendulum consists of a rigid rod of negligible mass and length
𝑙
l suspended from point
𝑂
O. A mass
𝑚
1
m
1
is fixed at a distance of
𝑙
2
2
l
from point
𝑂
O, while a second mass
𝑚
2
2
𝑚
1
...
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$Q$ total is not equal to $q$ enclosed and $q$ outside through Gauss law [closed]
This is the answer to the question that what would be the flux through a cylinder which has same centre as that of a sphere of radius $R$ containing charge $Q$ if the height of sphere is greater than $...
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answer
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How to obtain the Virasoro decendent $\alpha_{-1}^2|0\rangle$?
It was known that $$[L_m,\alpha_n]=-n \alpha_{m+n}$$
For a virasoro primary states $|\alpha\rangle$, one could act on the $L_{-n}$ raising operator to obtain the decendents $L_{-n} |\alpha \rangle$.
...
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How to prove that during acceleration a particle can have only either parabolic or linear trajectory? [closed]
How I can prove that if a particle is in motion with constant acceleration its trajectory will only and only either parabolic or linear.
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Small block attached to a spring on a wedge [closed]
I recently came across this question:
A wooden wedge of mass 𝑀 is placed on a smooth table. A small wooden block of mass 𝑚 is connected to the top of the wooden wedge with a spring of elastic ...
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Moment of inertia of a quadrilateral [closed]
I found this problem in one of my tests.
Here's a uniform slab $OABC$. Now $\overline{CB}$ $= 10cm, \overline{AB} = 2cm, \angle B=\angle O=90^\circ,$ $\overline{OA} = \overline{OC}$. What will be the ...
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What exactly is the upper cabin mass used for and how is the problem solved? [closed]
Two elevator cars of masses m1 and m2 that can be raised or lowered are connected by a rope with tension T1. There is an object of mass m3 in car 1 on which the vertical force of the support and the ...
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Two friends on a frictionless well [closed]
Two friends A and B each weighing
40 kg are sitting in a frictionless well having vertical circular smooth wall . They subtend angle 90 degree at the centre of well . A rolls a ball of mass 40 kg in ...
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Direction of Force on an Inserted Dielectric [closed]
If I correctly understand the physics underlying how capacitors work, then whenever a dielectric is inserted between the plates of a capacitor, the interaction between the electric field induced in ...
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vote
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answers
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How to find the spring constant using a weight, a timer, and a ruler? [closed]
I'm a high school physics student and in my class we are doing a lab which involves finding the spring constant using this phet spring simulator (in the lab all settings are the default except that ...
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Derivation of Rotational Inertia for a uniform cylinder [closed]
I'm a high school student studying physics. I have foundational knowledge in calculus and physics, but my skills in the application of calculus are (evidently) weak. I was performing the derivation of ...
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Infinite Hexagon Grid of Resistors [closed]
How to find the equivalent resistance between two opposite points, the resistor between any two points is $R$. For adjacent and one point apart, the answer comes out to be $R$ but cannot do the same ...
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Problem regarding torque [closed]
I am unable to find a correct answer to this.
X and Y are two forces (as shown in the figure below) 400 cm apart. O is the point midway between X and Y. P is a point along X. Calculate the sum of ...
