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Physics : Recent Questions and Answers (Page 250)

Find answers to your questions about Physics or help others by answering their Physics questions.

When a car is moving at constant speed, is chemical energy in the engine still being converted to kinetic energy?

I know for the car to be moving at constant speed, the driving force equals the magnitude of all the opposing forces so kinetic energy is not increasing and net...

Asked on 06/19/2021 by Bloomlet

2 answer

How reflective is the aluminum foil used for food, under "normal" conditions?

I'm interested in using normal "Reynolds wrap" type aluminum foil as a radiant barrier. What are some measures of how much light and heat this would reflect under ideal and...

Asked on 06/19/2021

1 answer

Special Conformal Transformation Acting on Spinor Variables

I'm working in 3,1 Minkowski spacetime, representing null vectors as a product of two commuting spinors so that eg. $$p_i^{dot{alpha}alpha} = |i]^{dot{alpha}}langle i|^alpha.$$ I know that special conformal transformations...

Asked on 06/19/2021

1 answer

In a resistor capacitor circuit, when capacitor is discharging, do the free electrons in the conducting wires or resistor move?

In normal battery resistor circuits, battery doesn't store any charge, its basically the free electrons of resistors /conducting wire that moves in a circuit. But in discharging of capacitor, charge...

Asked on 06/19/2021 by Raghav Madan

2 answer

What prevents this infinite energy generator from working?

I thought up a device that uses the Oberth effect (wiki) to generate more energy than it consumes. Obviously, I made a mistake/logical error somewhere. Can you...

Asked on 06/19/2021 by odin1337

2 answer

How do you translate from separate vector potential gradients to magnetic field components?

In an attempt at calculating anisotropic London penetration depths, I have obtained equations of the form $$begin{split}-mu_0^{-1}nabla^2B_x &= Zpartial_yA_z - Tpartial_zA_x-Ypartial_zA_y,-mu_0^{-1}nabla^2B_y &= Xpartial_xA_x + Tpartial_zA_y -...

Asked on 06/19/2021 by 9cco

1 answer

If gravitational field is not real, then am I gaining energy?

I don’t know much about General Theory Of Relativity but I have heard that it does not consider gravitational fields like Newtonian Mechanics. If an object were to be free...

Asked on 06/19/2021 by supransh

1 answer

Jacobi equation for the geodesic deviation in the weak field limit

The geodesic deviation equation can be written in the following form$$nabla_U^2 xi = R (U, xi) Utag{1}$$where $R$ is the Ricci tensor. It...

Asked on 06/19/2021

1 answer

Ferromagnetic field near a ring in Earth's magnetic field

Let's say I am trying to find out the effect that an iron ring has on the Earth's magnetic field (approximated to a uniform field at infinity). Can I solve...

Asked on 06/19/2021

1 answer

Lagrange equations with friction with indirect velocity-dependency

I have a simple pendulum (a point-mass attached to a rigid massless rod) and want to model friction between the rod and the axis it's attached to.My assumption is that...

Asked on 06/19/2021 by M1cha

0 answer

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