A tired physics student drags their backpack along the ground behind them. They exert a force of 20 N at an angle of 55 degrees above the
horizontal. The backpack has a mass of 5 kg and is moving at a constant velocity.

What is the coefficient of sliding friction between the backpack
and the ground?

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation