How fast must you throw a water balloon to hit someone 45 m away if you have to throw the balloon at an angle of 20o?(Round your answer to the nearest meter per second)

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Burgers vector is generally parallel to the dislocation line. a)-true b)-false