Recent content by somega

Thank you, this is exactly what I meant! This effect is often not mentioned when it comes to centripetal/centrifugal forces. I know on Earth this effect is very small. That's why I talked about a planet rotating once each 3 seconds (and an acceleration of 9.81 m/s² for falling apples near the...

I think I was wrong. I forgot that if the speed remains the same and the direction changes then there's no force. And so there's nothing to feel!

No I'm not talking about g-force! I wrote g=9.81. I thought because of the value it should be clear what I mean. I've looked up Earth rotation speed. It's 464 m/s. So when you are now traveling with 464 m/s then after 12 hours you are traveling at -464 m/s. That's (464*2)/12h m/s = 0.02 m/s²...

Let's assume you have a acceleration sensor (as there is in smartphones). Of course you need high precision. You start the measurement at midnight somewhere on the equator. After 12 hours the Earth rotation has accelerated you and you are now traveling with the same speed but in the opposite...

Isn't 9.81g the difference between the gravity force and the centrifugal force? So on a 9.81g planet you can walk like on Earth regardless of its rotation? (That's what I've read on wikipedia.)Here is another drawing: On a not-rotating planet you are never accelerated. On a rotating planet...

In my drawing you can see: A generic bulb covered by a mirrored hollow ball. The hollow ball has a small hole (1 mm diameter). So the complete light will go through this small hole. The lens will bundle the light in a very distant (100 km) focal point. I guess it might be hard to create such a...

Look at the picture. Before the rotation you are looking at a fixed star. After 180° you are looking in the opposite direction. Isn't one planet rotation like one rotation on a office chair?

I think if g=9,81 you cannot get blown off? g is not the gravity but instead the difference between gravity and centrifugal force.

It's often said that you don't feel Earth rotation because the gravity acts against the centrifugal force. Of course this is true but also your body is turned around once each 24 hours. So I wonder on a planet which is rotating once each 3 seconds and has same g=9,81: Would you feel the rotation?

I know the amazing thought experiment by Albert Einstein with the two light clocks. (The observer at the train station has a light clock and the person in the train.) It's amazing because you can even deduce the formula to calculate how fast the clock in the train goes. But this experiment...

Can we say as a conclusion that Einstein's influence to smartphones is there but it's very small?

I told a friend that without Einstein's discoveries he would not have his smartphone. I thought about the components (display, CPU, radio waves, ...) containing discoveries made by Einstein. But I can't name an exact example. My friend told me it's all pure electronics. No relativity and so...

Let's assume the following sine signal sent by a low frequency (100 kHz) transmitter. I think with the information that the sending power is 1 watt and the starting phase is 0 the signal is fully described. Are the following assumptions correct?: 1. The frequency of all photons leaving the...

Does a photon have a frequency at all? Or is it the electromagnetic signal which has a frequency? (And the electromagnetic signal is made of many many photons.)

On the image you can see a photon starting at point A at t=0. The photons travels along the sine function and arrives point C. I knot that this takes T=λ/c. But this is the time for a object traveling directly from the origin to point C and not along the sine wave! If the photon travels...