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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17 views

getting wrong answer when i vector sum relative velocity and velocity of observer(river in my case)

so there's this question, and I get the right answer if i don't vector sum relative velocity and river flow of the water, when if i do I get velocity of man wrt ground equal to √41/2, and I get the ...
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Show that evolution of uncertainty is parabolic

Consider the case of a free particle with wavefunction $$\Psi(x, t=0) = \left(\frac{a}{\pi}\right)^{1/4} e^{-ax^2/2} \quad a>0$$ Prove that the uncertainty product $(\Delta x)(\Delta p)$ is ...
40 views

Is there a way to solve this statics problem algebraically?

This problem can be solve in 2 ways either I solve it with vectors which would be relatively painful and more time consuming and the other faster way is algebraically but I faced a problem when trying ...
42 views

How to calculate the trace of six gamma matrices multiplied to $\gamma_5$?

I read from Weinberg that, the gamma matrices have the following property: \text{Tr}\{\gamma_5 \gamma_\mu \gamma_\nu \gamma_\rho \gamma_\sigma\}=4i\epsilon_{\mu \nu \rho \sigma} \end{...
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Does the pressure in dynamic fluids depend on speed or cross sectional area?

I have encountered this question in my Giancoli Physics textbook, and I am pretty convinced that the answer should be A and E. But the solutions manual has neglected E as a potential answer and ...
55 views

Centre of mass of a quarter of disc (doubt in my solution) [closed]

Can please anyone tell where am i wrong in this approach of solving this question.. The ans i am getting is (4 root2)/pi but ans is (4 root2)/3pi
60 views

Some books write coulomb force is medium independent and some write it is medium dependent why so?

Some authors say coulomb force is medium independent others say it is medium dependent. I know value of universal gravitational constant does not depend on medium.But value of permittivity does depend ...
67 views

Do object properties such as mass and dimension affect friction force on inclined surface?

If we have two blocks, first weighing $2 \text{ kg}$ with dimensions $10 \times 2$ and second weighting $4 \text{ kg}$ with dimensions $20 \times 2$, and place them on an inclined surface, would they ...
In section 5.3 of Kardar's Statistical Physics of Particles, the van der Waals equation is given as: $[P+\frac{u_0 \Omega}{2}(\frac{N}{V})^2][V-\frac{N\Omega}{2}]=Nk_BT$ The van der Waals parameters ...
What is the uncertainty of: $y=(\frac{a}{b})^{n}$ Would it be: $\Delta y = n (\frac{\Delta a}{a}+\frac{\Delta b}{b}) y$