# 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.

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### Capillary rise for a tube with a glass rod [closed]

Take a capillary tube (glass) of diameter $d_2$ dipped in water vertically. Now a glass rod with diameter $d_1$ is inserted in the tube. Find the height to which the water rises. Take contact angle to ...
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### Net Force on a System [closed]

In the figure given below is a system of a mass M ,a pulley and 2 masses of mass m. Now there is friction between bodies A and C and B and C. A force ($F$) is applied in such a way that body C is a ...
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### What is the radiation pressure on sphere of radius $r$? [closed]

Consider a planet with luminosity $L$ and a sphere of radius $r$ which is localized at a distance $d$ away from the planet. I would like to compute the radiation pressure that the planet exerts on ...
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### Inner and outer ring, Biot-Savart law [closed]

So basically I have an inner ring with radius $R_2$ and an outer ring with radius $R_1$, with current $I_0$ flowing through the outer ring. I am asked to evaluate the magnetic field strength at the ...
57 views

### Gravitation: Collision of a satellite and Meteorite [closed]

A satellite is orbiting around a planet in a circular path of radius $R$. A meteorite of mass $m$ collides with the satellite and sticks to the satellite. After collision, the satellite is seen to ...
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### Does anyone know how the equation was derived from the given conditions?

When the operators are multiplied together, the term f(hw)g(hw)aa or f*(hw)g*(hw)aa will be kept. But why those terms disappear in the Green function given below?
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### How will Decreasing Velocity Affect Time Dilation? [duplicate]

Imagine that we have two observers, named $O_1$ and $O_2$. $O_1$ is traveling at a velocity of $\frac{c}{2}$ for $60$ seconds while $O_2$ is completely still. According to the equation for time ...
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### How do I calculate the maximum separation between a chord and arc when I only know the length of each? [migrated]

If I know the length of a chord and I know the length of an arc that both have the same starting and ending points (A and B), how do I calculate the maximum separation between them? (D and D1) What is ...
### Proof that $U$ is an unitary operator [closed]
I have a function $f$ mapping a bit onto another bit, i.e. $f : \{0, 1\} \rightarrow \{0, 1\}$. The function f is either constant, so f(0) = f(1) or balanced, so f(0) $\neq$ $f$(1). The quantum gate ...