"The principle of relativity: The laws of physics are the same in all inertial reference frames."
Is in classical physics The laws of physics aren't the same in all inertial reference frames!? Give an example in classical physics
According to Einstein's second principle of relativity:
"The principle of the constancy of the speed of light: The speed of light in free space has the same value c in all inertial reference frames"
Does free space mean vacuum? Is this principle not valid in the air and the...
I read this text in physics book:
"Another example is the so-called Cerenkov radiation, which consists of light waves emitted by charged particles that move through a medium
with a speed greater than the phase speed of light in that medium. The blue glow of the water that often...
A ship that moves at a speed very close to light, its relative mass increases and may be comparable to the mass of the planets or the sun, in this case it can change the orbit of the planets and the sun (according to the law of gravity of two bodies)
Is this analysis correct?
When a person walks, it is clear that an external force enters the sole of the foot from the ground and agrees to move in that direction, but in the case of a car, where is the direction of the reaction force and where does it enter?
The car that accelerates must enter according to the equation below the external force, while such an external force does not seem to exist.
The force of friction between the car and the road is in the opposite direction of motion
Suppose we have a rotating body like a bicycle wheel in space away from gravity. This body stops after a while due to friction between the wheel and wheel axles. Is not the conservation of angular momentum violated?
According to Hubble's law, the Andromeda Galaxy should move away from us at a speed of about 55 kilometers per second, but on the contrary, the galaxy is approaching us at a speed of 110 kilometers per second!
" weak interaction, is responsible for certain types of particle decays"
That is, if this force does not exist, the particles will not decay.
Pay attention to this sentence
The weak force between two neighboring protons is about 10^-7 of the strong force between them, and the range of the weak...
Of the 4 fundamental forces, I did not understand the weak nuclear force. Is the weak nuclear force attractive or repulsive or both? It works between two particles, that is, it is the interaction of two particles?
A spacecraft with as much fuel as possible can reach any speed. For example, if the spacecraft 's fuel is 10^9 kg, it results in the simplest case, that is, the conservaton of the momentum for the variable mass.(extremely high speeds of the ejected ions=50 km/s)
vi=0, Mi=10^9 kg, Mf=10^3 kg...
Is there a possibility of a celestial body colliding with the Voyager spacecraft ?
Is there an alternative to the Voyager that runs faster and faster?
For example, at a speed of 100 kilometers per second