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VashaNatasha [74]
3 years ago
6

Cooling water is fed by gravity from an open storage tank where the water level is 20 ft above the ground through 100 ft of 1 ½

inch ID steel pipe (light rust), to a heat exchanger at ground level. If the pressure entering the heat exchanger must be 5 psig for it to operate properly:
(a) Ignoring the kinetic energy change, what is the water flow rate through the pipe?
(b) After ignoring the kinetic energy, validate whether this was a good assumption.

Physics
1 answer:
Vitek1552 [10]3 years ago
6 0

Answer:

Explanation:

Solution is attached below

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How could you test the hypothesis that elephants interpreted the ground signal as being farther away than the air signal?
bekas [8.4K]

Answer:

One way to test the hypothesis is to create two waves, one in the air and one on the ground at the same time. One of them for the elephant to get closer and another for the elephants to move away. Observe the reaction of the animal and with this we know which sound came first.

Explanation:

This hypothesis is based on the fact that the speed of sound in air is v = 343 m / s with a small variation with temperature.

The speed of sound in solid soil is an average of the speed of its constituent media, giving values ​​between

 wood      3900 m / s

 concrete 4000 m / s

 fabrics     1540 m / s

 earth       5000 m / s wave S

 ground    7000 m / s P wave

 

we can see that the speed on solid earth is an order of magnitude greater than in air.

One way to test the hypothesis is to create two waves, one in the air and one on the ground at the same time. One of them for the elephant to get closer and another for the elephants to move away. Observe the reaction of the animal and with this we know which sound came first.

From the initial information, the wave going through the ground should arrive first.

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