When a light ray in air enters water at 15° from the normal, it slows down and   

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is  

The net force on any object in equilibrium is

Which setup of kids will make it easiest to rotate a merry-go-round?  

An object falls freely from rest on Earth. After the first 5 seconds it falls a distance of  

Colors seen on some TV screens result from (Red, Green and Blue colors combined)

A projectile is launched from ground level at 15° above the horizontal and lands downrange. What other projection angle for the same speed would produce the same down-range distance?  

The net force on any object in equilibrium is

The resistance of a filament that carries 2 A when a 10V potential difference across it is  

The voltage across a 10-ohm resistor carrying 5 A is