You can get sunburn on a cloudy day but you can't get a sunburn even on a sunny day if you are behind glass. explain why

354-26-29E

Sunburn is caused by ultraviolet rays. For ultraviolet rays, clouds are semi transparent, so we can get sunburn even on a cloudy day. However, glass is opaque to UV rays. The rays cannot reach them and so we are protected from sunburn

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y