Recent content by rechitzy

I was researching and i believe i have to use this formula but how to calculate the pressure?? Q=πR4∆p/(8ηL)

Homework Statement Water (η = 1.00E-3 Pa*s) is flowing through a horizontal pipe with a volume flow rate of 0.0121 m3/s. As the figure below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0424 m and L = 0.679 m. Homework Equations No idea how to...

it was right, thank you soooo much for your help.. can you please help me with this one? https://www.physicsforums.com/showthread.php?t=399693

ok i got a different answer now 14.3157 is this one right?

ok i believe i did the 198/190 times 340 -1 is that right?

Homework Statement A liquid is flowing through a horizontal pipe whose radius is 0.0215 m. The pipe bends straight upward through a height of 10.1 m. The pipe then bends back to the horizontal direction with a different radius of 0.0399 m. What volume flow rate will keep the pressures in the...

i got 353.3157

Homework Statement A stationary whistle emits a sound of 190 Hz. If a car hears the whistle with a frequency of 198 Hz, how fast was it moving (in m/s)? Use 340 m/s for the sound velocity Homework Equations f'=(1+Vo/V)f ======>>>> equation for the observer moving toward stationary...

But don't i need the mass in order to do that?

Homework Statement A boy of mass 60.0 kg is rescued from a hotel fire by leaping into a firefighter's net. The window from which he leapt was 8.0 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s. 1.What is...

Homework Statement Two billiard balls, one heading north at 15.0 m/s and a second heading south at 10.0 m/s, collide head-on. Take the collision to be perfectly elastic and choose the positive direction north. What is the post-impact speed of the first ball Answer: m/s What is...

Got it! it is right THANKS YOU SO MUCH collinsmark AND ideasrule I REALLY APPRECIATED

on 6 i believe it is true because it does reduces the force it takes to do a task on 2 is true on 3 the net work done on an object is equal to the change in its kinetic energy so it will be false for 3 is this right?

Thanks i already figured it out.

Ok, would this be KE1+PE1-Efr=KE2+PE2?