Grain is pouring into a silo to be stored for later use. due to the friction between pieces of grain as they rub against each other during the pouring process, one piece of grain picks up a charge of 6.0 e -10 c and another piece of grain picks up a charge of 2.3 e -15 c. what is the electric force between them if the pieces of grain are 2 cm apart?

Could someone . i have tried to solve myself but my calculation is off

Argon, neon, and xenon are examples of

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?