Forces between objects act when the objects are in direct contact or when they are not touching. Can you think of any forces that can act at a distance?

50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?