Avillage maintains a large tank with open top with water. the water can drain out of the tank through a hose of diameter 6.60 cm. the hose ends with a nozzle of diameter 2.20 cm. a rubber stopper is inserted in the nozzle. the water level in the tank is kept 7.50 m above the nozzle. (a) calculate the frictional force exerted by the nozzle on the stopper. (b) the stopper is removed. what mass of water flows from the nozzle in 2 hr?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?

What are some properties of transverse waves?

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.