When a nerve cell fires, a charge is transferred across the cell membrane to change the cell's potential from negative to positive. For a typical nerve cell, 9.0 pC of charge flows in a time of 0.47 ms.
What is the average current through the cell membrane?

Explanation:

The given data is as follows.

      q = 9.0 pC =    (as 1 pC = )

      t = 0.47 ms =  (as 1 ms = )

As we know that relation between charge and current is as follows.

             I =

Putting the given values into the above formula as follows.

             I =

               =

               =

or,           = 19.14 nA

Thus, we can conclude that the average current through the cell membrane is 19.14 nA.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//