Recent content by aloshi

how can we sad that photon does not have a mass? in my book they are a piece that there write at the photon influence of gravitation?

incomprehensible, /inconceivable, /unimaginable mathematically, I can understand. but physically, I can not understand what means whith momentum

but it inconceivable, mathematically is momentum the mass times velocity.momentum = mv.

excuse me for (excuse my) disturbing you, doesn't admit of [any] solution. is still being discussed what is the meaning of momentum?

Hello! English is too difficult to comprehend I have read the definition at para. 233 on page 137 of Smith. could not really understand how he came to the F = mv.

why is the force F=m_1*v_1?? is There a formula that says the force is F=m_1*v_1?? I have not seen that, but in the book you find it.

how can I calculate the radius of Io's orbit?

what is missing for the info to the determination / calculation of the mass of Io

If you look at the planet Jupiter, the planet appears as a bright disc. Already at a magnification of 10x, you can even discern the four "Galilean moons (Io, Ganymede, Callisto, Europa). Below is a picture of it you can see if you are sending a telescopes to Jupiter...

what is it that makes the vector is not equal before (compression vector) and after (restitution vector) collision?

hi! thanks for all the answers. you have write; So if the vector is equal before (compression vector) and after (restitution vector) collision , This means the material is perfectly elastic. And if the vector is not equal before (compression vector) and after (restitution vector)...

http://www.pluggakuten.se/wiki/images/7/7b/Grav%2C.JPG orbital time is 22 h and 50 min. how can I rcalculate mssan for Io? The mass fore Jupiter is 318\cdot 5,98\cdot 10^24 totally mean distance from Jupiter to Io is: \frac{T^2}{r^3}=\frac{4\pi ^2}{GM}\rightarrow r^3=\frac{T^2GM}{4\pi...

but the task Says determine the universal gravitational constant, sow i don't new how to doit

Phobos, a moon of Mars, moving around planten in a circular orbit of radius 9,5\cdot 10^6. phobos period of revolution / orbital time is 7 h and 39 min. calculate the mass of March with the help of the given data and the constant in Newton's law of gravity. it is easy to calculate the mass in...

have i understand it right? Compression : the force comes from the speed at which balls are? because the velocity is a vector. a vector has both direction and size, it is right ? restroring force is the internal force that enables/make them to starts to expand again (back to its original...