Let's say the engines are at the back end of each rocket. For the viewer "A" in the initial frame, they begin moving and continue accelerating simultaneously, and clocks next to...

Clocks Within Each Ship in Bell Spaceship Paradox]]>

How to stop worrying about your exam?]]>

The Dawn spacecraft observed Ceres for an hour on Jan. 13, 2015, from a distance of 238,000 miles (383,000 kilometres). A little more than half of its surface was observed at a resolution of 27 pixels. This video shows bright...

Ceres at 71000km, 139% size of full moon]]>

Or is there some way to support the stack at an intermediate point so...

Container stack height on a ship: Mechanical strength]]>

for two batteries in parallel then, what happens to the two fields at the junction such that...

Why do batteries in parallel add in current but not voltage?]]>

Transferring Liquid Helium to Another Container]]>

Metropolis [the rerelease by Giorgio Moroder]

Solaris

Brazil

The Man from Earth

I just caught one that I'd never heard of before, called

concept of reduced mass]]>

I'm having a problem for some time finding out which of these materials are conjugated polymers and which aren't.

Can somebody please help me?

]]>

So in the example Alice and Bob are detecting the polarisation for the two entangled...

A question on calculating entangled spin probability]]>

The wave function of a certain particle is Ψ= A cos^2(x) for -π/2 < x < π/2. Find the value of A.

My answer is coming out to be zero wheres as the correct...

Wave function]]>

"The reason why gravitational force vanishes inside a spherical shell can be seen by a simple argument due to Newton. Consider the two small mass elements marked out by a conical surface with its apex at ##m##.

The...

Newton's argument, gravitational force inside a sphere]]>

I am working on a process design project and was wondering if I could get some help. While this is classwork material, I thought this is too big of a problem to post in the homework section, and would be more suitable in a forum such as this one which has much less traffic. For...

Production of Acetone process]]>

Will people see the world in a completely different view?]]>

If we take Earth's mass as m...

Bending of space and time, is it true?]]>

From the following link http://www.astronomynotes.com/telescop/s3.htm

And I just can't seem to figure out why the first telescope design doesn't show a shadow and in the second why the presence of the secondary...

Understanding reflecting telescopes?]]>

I had a few questions regarding hydrogen.

I know for a fact that hydrogen has a high value of specific heat.

My questions are:

1). Isn't hydrogen supposed to be a good coolant, and if it is is it actually used ?

2). If it is a good coolant how does it work as a fuel ?

I hope these...

Hydrogen and it's Specific Heat.]]>

Why does it look like a ripple on a pond instead of a three dimensional object?]]>

I know it is a very general question but anything you know of...

Diagram That Contains All The Different Kind Of Physics?]]>

Find the centre of mass of solid cone.

$$y_{cm}=\frac{1}{M}\int_0^Hydm$$

First I took thin disks. I got the answer when I assumed its thickness to be dy but then...

centre of mass of solid cone]]>

So I'm wondering how such a microphone operates (just that type of mic in general). I searched online for...

In line microphone]]>

A speed equivalent of gravitational acceleration?]]>

If i have a system with one linear conductor and point, it's not problem to determine magnetic field at point, nut what happens if i have to determine the magnetic field at the straight line parallel to the linear conductor....

Magnetic field at single point and straight line.]]>

Problem: A police car travelling at 80km/h is passed by speeder travelling at 145km/h. 3 seconds after the speeder passes, the police car starts accelerating at 2.5m/s

Speeder and Cop Question]]>

- Existence of inertial reference frames
- F = ma
- F(A on B) = -F(B on A)

It is clear to me that the...

Independence of Energy and Momentum Conservation]]>

Medical Physics in Canada]]>

and the boundary conditions are:...

I have a problem in solving laser rate equation, I need help]]>

Here is the link to the old thread. https://www.physicsforums.com/threads/random-thoughts-part-three.745013/

Random Thoughts part 4]]>

Car crash project?]]>

Can white dwarfs have iron cores?]]>

Given the data in the table below, ΔH°

4NH

is ________ kJ.

Substance ΔH∘f(kJ/mol)

H

NO (g)...

Calculating ΔH°rxn for a Reaction]]>

Made a discovery and I would like to publish it any advice?]]>

Friction is a Scalar]]>