Recent content by caspeerrr

Homework Statement I have attached the question. Translated: Suppose T: R^4 -> R^4 is the image so that: ... Homework Equations So I did this question and my final answers were correct: 1. not surjective 2. not injective. My method of solving this question is completely different than the...

Homework Statement When do you use W = Fd cos(a) and when do you use the integral of F? Homework Equations W = Fd cos(a) Integral of F The Attempt at a Solution When doing exercises it seems random to me when I have to use the formule W = fd cos(a) and when I have to use the integral? What...

Homework Statement I uploaded the question as an attached file. Homework Equations Fz = mg , F = ma , The Attempt at a Solution The slope : x Perpendicular to the slope: y I thought the Y forces can be neglected because the normal force counters the y component of the gravitational force...

When reading about this subject on the internet, I found two ways how it works and I don't know which one is correct. 1: A particle pair is created near the black hole horizon. So there is an antiparticle and a particle. The antiparticle gets sucked into the black hole but because the...

Homework Statement I'm trying to understand the information paradox at a black hole. Can three particles be entangled? I read on a site that it's impossible to entangle multiple particles. When searching on google I found out that it is possible for multiple particles to entangle. So what...

Thanks for your answer! So is it known what really happens? I don't have access to physics textbooks and have to work with google. Further, I read somewhere ( can't find where) that in a vacuum, it is not possible to have any particles. Only energy can exist in a vacuum. So this is not true?

Homework Statement For school I'm doing a project on hawking radiaton but I have very big difficulties trying to understand it. I'm trying to understand the matter about: Unruh effect, particle pair (antimatter - matter) and the theory of relativity regarding vaccuum. Homework Equations none...

Aaah I get it, thank you!

The question is about a box with no movement standing on a hill. The hill has an angle of 25 degrees. The box has a mass of 40 kg. 1. Calculte the gravity This I still get: F= M x A = 40 x 9,81 = 3,9 x 10^2 The next question tough: 2. Calculate the component Fgravity,x off the gravity...