Monday

April 21, 2014

April 21, 2014

Posted by **jessi** on Sunday, March 22, 2009 at 11:16pm.

The answer is supposed to be in Newtons but I don't see how that would work. I know that with water one L is about one kg, so that's no problem converting. Does gravity factor in somehow because it's up at that height?

- physics -
**drwls**, Sunday, March 22, 2009 at 11:28pmThat's a neat problem. The falling water applies a force to the bucket that must be added to the weight to get the scale reading. The added force equals the force that the bucket applies to the water to stop its fall. The bucket reduces the momentum of the water at a rate of dM/dt * V, where V is the velocity when it hits the bucket,

V = sqrt(2gH) = 6.57 m/s.

The water flow rate dM/dt is 0.22 kg/s

Total force = (0.720)*g + 6.57*0.22 + (3.2)(0.22)*g = 7.06 + 1.45 + 6.90 N

The last term added is the weight of water already collected at t = 3.2 s

- physics -
**jessi**, Sunday, March 22, 2009 at 11:34pmhow did you get that the velocity is sqrt(2gH)?

- physics -
**jessi**, Sunday, March 22, 2009 at 11:36pmnevermind i figured it out

**Related Questions**

physics - Water of density 1000 kg/m3 falls without splashing at a rate of 0.241...

physics - water density 1000 kg m3 falls without splashing at a rate of .37 L/s ...

college physics - A 0.580-kg bucket rests on a scale. Into this bucket you pour ...

Physics - You swing a 5.9 kg bucket of water in a vertical circle of radius 0.3 ...

math - how do you measure and get 4 gallons of water only having an unmarked 5 ...

physics - A cylindrical 7.25 kg pulley with a radius of 0.864 m is used to lower...

Mathematics - water is poured into a cylindrical bucket with the base area of ...

Physics - A cylindrical 7.00-kg reel with a radius of 0.60 m and a frictionless ...

science - Imagine that you fill a bucket to the top with water and then place ...

physics - A 3.3 kg bucket of water is raised from a well by a rope. If the ...