A man is running up an escalator. He is moving 5 m/s, but the escalator is also moving up at 3.5 m/s. Find the resultant velocity.

The experiments with static charges were done by:

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

Which is not true about oxygen-17 and oxygen-18?