Why do we not notice a difference in the fall and winter in the amount of oxygen in the air even when leaves fall off

Act has a 1200: 5 or 240: 1 turns ratio. it is short circuited. what is the maximum current at 1200a primary if we put a 100ohm resistor across the secondary end of the ct. use it as current source circuit.

What is the coefficient of kinetic friction μk between the block and the tabletop?

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass