Water is being drained through a hole at the bottom of a tank at a velocity of 10 m/s. For a tank diameter of 1.18 m and a hole diameter of 5 cm, find the rate of change of the water level in the tank in m/hr.

If you have a flat tire and need to pump up the tire on your car with a hand pump, what force do you have to apply to the pump handle?  Assume the air pressure in your tire will be 20 lb/in2, that is 1.1 KPa (138,0000 N/m2). Let the air pump have a cross-section that is 5 cm in diameter.      It depends on the weight of the car.     About 270 N when the tire is full, not much when you start pumping on the empty tire.     About 270 N for as long as it takes from the beginning.       Just a few newtons until you are satisfied with how full the tire is because of the hand pump.