a person jogs eight complete laps around a 400-m track in a total time of 15.1 min .calculate the average speed, in m/s .
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The power dissipated by the whole string of tree lights is:
where
V is the potential difference of the whole circuit
I is the current flowing through the tree lights.
By using P=68 W and V=120 V, we find the current:
Ohm's law for the whole string of tree lights is:
where
is their equivalent resistance. Re-arranging the equation, we find the value of the equivalent resistance:
where
V is the potential difference of the whole circuit
I is the current flowing through the tree lights.
By using P=68 W and V=120 V, we find the current:
Ohm's law for the whole string of tree lights is:
where