Three fire hoses are connected to a fire hydrant. each hose has a radius of 0.025 m. water enters the hydrant through an underground pipe of radius 0.075 m. in this pipe the water has a speed of 3.1 m/s. (a) how many kilograms of water are poured onto a fire in one hour by all three hoses? kg (b) find the water speed in each hose. m/s

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm