Please help!
A mass point at $$r = 3i + 4j - 2k$$ rotates with a rotational velocity $$\omega = 2i - 3j + 5k$$ around an axis. Calculate the velocity vector and the speed of the mass point given that the units for its coordinates are in meters and the units fro the components of the rotational velocity are rad/s.
Thank you

Question

Please help!
A mass point at $$r = 3i + 4j - 2k$$ rotates with a rotational velocity $$\omega = 2i - 3j + 5k$$ around an axis. Calculate the velocity vector and the speed of the mass point given that the units for its coordinates are in meters and the units fro the components of the rotational velocity are rad/s.
Thank you

michele_laino · Answer

please use this formula:
$$v=\omega \times r$$
where v is the vector of velocity and X is the cross product between vectors

michele_laino · Answer

do you know how to perform the cross product between vectors, please?

surry99 · Answer

are you ok with this or do you need further explanation?

roberts.spurs19 · Answer

Sorry, haven't been able to get online! 
Thank you for your help, I completely forgot about cross product!

surry99 · Answer

Remember the order in which you cross them is very important, it must be omega cross r.