Recent content by irrehaare

So the bat is flying with velocity 172 m/s and he see himself in mirror which is parallel to the direction of fly. He can himself in the mirror because he send a sound signals with velocity 344 m/s. So now i have to count angel to the direction of motion. a) first in arrangement of air b) in...

ok it is pendulum effect but how it's happend' for exampel i don't have air friction so the energy is constans, after damped the vertical swings, the horizontal motion will grow big? and my second question is how the horizontal motion depend on the mass and the stretch of spring ?

Sometimes after few moments of perpendicularly vibrate the mass hang on a spring, starts vibrate horizontal. I must know why it happened ? any books or answers are see pleasant .

rotational motion I have a problem with describe rotational motion for the cube, i met the rotational motion for the circle shapes but cube is somthing new, so if u know any sources, exampels or solution and book where i can find descirbe of rotational motion for cube pliss give me a sign or...

Thx now i correctmy solution i have somthing like this: F-uQ=0 and F/2 - u(Q-Fcos60)=0 my result is: u=3/cos60 so the solution depends on the u (coefficient of kinetic friction) Now am J correct ?

in first situation block is pulled with force F . in second situation we have the same block with the same force F but under angel 60 degrees. it is possible that in both situation motion is uniform. ?? (we have friction) so imo it isn't possible because The block is in the both...

of cours i tried but it is a exercaise from book and i have an answer at the end. But my solution is incorrect. So i ask here. And i tried to count forces work on thread on my picture.

so nobody know the answer or i wrote quastion to complicated ?

J must count acceleration of each weight and the force of strain thread. Here is a picture:

j thing that better way to learn C is to write by your own a programs. U can pattern on the other source-code or fine a book or a course with codes.

i found this: http://www.bloodshed.net/dev/devcpp.html http://www.digitalmars.com/download/freecompiler.html or look here https://www.physicsforums.com/showthread.php?t=32703

i thought that it depend on the environment where is the light, so the velocity of light in air is different than in water or glass . see more about diffraction of light