Super conductors use very low temperature in order to decrease the of a material

Air flows upward in the wick of a lantern because of the liquid property called

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f