How much heat does it take to raise 0.0438 kg of aluminum from
room temperature (20.0°C) to its
melting point (660°C)?
Aluminum
c = 900 J/(kg*c)
(Unit = J)

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/4zZs6GM

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach