When leaving a fish tank, a ray moving at 31.0 degrees in glass (n = 1.50) exits into the air. At what angle does it enter the air?
(Unit=deg)

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving

Acyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34×10−27kg. the deuterons exit the cyclotron with a kinetic energy of 6.40 mev .a-what is the speed of the deuterons when they exit? b-if the magnetic field inside the cyclotron is 1.25 t, what is the diameter of the deuterons' largest orbit, just before they exit? c-if the beam current is 350 μa how many deuterons strike the target each second?

What would be the net charge of 1 gram gold piece after removal of 1% of its electrons