Physics Questions, Problems & Solutions : TransWikia.com ~ Page 100

Work done when lifting an object at constant speed

A previous post (What Is Energy? Where did it come from?) defines work qualitatively as "a process in which energy is transformed from one form to another form". And...

Asked on 08/23/2021 by lololololololol

7 answer

Is speed of light not constant in a strong gravitational field?

I remember reading a work stating that in the presence of a gravitational field, vacuum magnetic permeability and electric permittivity can change with distance $r$ to the center of...

Asked on 08/23/2021

1 answer

2-body problem, conservative central force, spherical symmetry, conversation of angular momentum, motion in a plane

I am having trouble unpacking the following argument from page 72 of Goldstein's classical mechanics book.We now restrict ourselves to conservative central forces, where the potential is V(r), a function...

Asked on 08/23/2021

1 answer

If an object is pulled at one end, how fast would an impulse travel to the other end in a realistic scenario?

In SR, there are a couple of paradoxes such as the bug-rivet paradox that require us to take into account a finite speed of impulse. Suppose I...

Asked on 08/23/2021

1 answer

Why Fizeau interferometers are much more popular than point diffraction interferometers for optical metrology?

If somebody wants to measure surface error of for example concave spherical surface - in most of the optical companies around the world Fizeau interferometer will be used, with relatively...

Asked on 08/23/2021 by BarsMonster

1 answer

Which basis 2-form elements represent positive traversals in Minkowski 4-space?

I'm certain some of this relies on arbitrary choice, for even in Euclidean 3-space, there is no a priori preferred choice of left versus right hand coordinates. In fact...

Asked on 08/23/2021

0 answer

What is the number of significant figures in $6*(7.203)**2$?

My textbook says:"In multiplication or division, the finalresult should retain as many significantfigures as are there in the original numberwith the least significant figures."but it also says...

Asked on 08/23/2021 by MinigameZ more

1 answer

Evaluating shear tensor by gravitational wave

The shear tensor is given by: begin{equation}sigma_{ij} = frac{1}{2}nabla_alpha U_beta + frac{1}{2}nabla_beta U_alpha + frac{1}{2} U_alpha U^mu nabla_mu U_beta + frac{1}{2} U_beta U^mu nabla_mu U_alpha + ...end{equation}...

Asked on 08/19/2021

0 answer

How can I determine the vector parallel to the long molecular axis?

I have a molecule in a system (the molecule is not in the center) with determined coordinates of all atoms. One of my molecule is on the picture below ...

Asked on 08/19/2021 by Alexander Petrov

1 answer

Why is the tachyon vertex operator $int d^2z :e^{ik.X(z,bar{z})}:$ integrated?

I understand that, from the state-operator correspondence, $$|0;prangle ;=;:e^{ip.X(0,0)}: |0rangle.$$This is given in Polchinski, equation (2.8.9).I am now trying to understand the S-matrix for $2times$tachyon ...

Asked on 08/19/2021

1 answer

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