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A 8.0 cm diameter horizontal pipe gradually narrows to 6.5 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 35.0 kPa and 22.0 kPa, respectively. What is the volume rate of flow? Av= ___________________m^3/s

Expressing the kinetic energy in terms of momentum (K=1/2mv^2=p^2/2m), prove using symbols, not numbers, that the fractional loss during the collision is equal to M/(m+M). Please help me.

A tennis ball of mass = 0.058 and speed = 28 strikes a wall at a 45 angle and rebounds with the same speed at 45 degree angle. What is the magnitude of the impulse given to the ball?....I tried a couple of times and didnt get the right answer.

What is the angular momentum of a figure skater spinning at 2.9 with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6 , a radius of 15 , and a mass of 56 ?