4) A Coil of 800 turns is wond of a wooden fermer and a Current of 5A flow through the Coil produced a magnetic flux of 200uwb
calculate
a) The Inductance of the coil

b) The averageValue
of the emf induced in the coil when the current
is revere in 0.2 sec​

Modify the equation fδt=δ (mv) to find the force of friction.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.