Answer:
A. 50.93 m/s
B. 201 kW
Explanation:
We have that pump is moving 0.1m³ of water every second. The nozzle is 5cm diameter = 0.05m , or 2.5cm radius. 2.5cm = 0.025m. The cross sectional area of the nozzle is therefore, A = πr²
π×0.025²
= 0.001963m²
Therefore, for 0.1m³ of water to pass through this nozzle in 1 second, it must be travelling at
0.1 / 0.001963
= 50.93 m/s
Pump is meant to impart energy to the water to raise it 4m from sea level to the nozzle and accelerate it from zero to 50.93m/s through the nozzle. Now, assuming no losses, the dynamic energy of the water is equal to the potential energy it would have if it was stationary at some height h.
P.E = k.E
mgh = 0.5mv²
h = v² / 2g
h = 50.93² / (2 ×9.81)
h = 132.21m
So the equivalent head of water required due to accelerating the water is 132.21m. The static head is 4m since the nozzle is 4m above the sea and there is a further loss of 3m of head in the system due to friction etc. So the total head the pump must provide is
132.21 + 4 + 3
= 139.21m
Density = mass / volume so mass = density × volume.
The Pump is moving 0.1m³ per second of water. Therefore in one second the mass of water pumped is
0.1 × 1030 = 103kg
The total energy transferred from the pump to the water is therefore
Potential enegry, which is = mgh
= 103 ×9.81 × 139.21
= 140,662.0 Nm/s
= 140,662.0 Watts
But, we are told that the pump is only 70% efficient. Which implies
140,662 = 0.7P where P is the power supplied to the pump
so P = 140,662 / 0.7
= 200,946 Watts
= 201 kW
Answer: Vo= 39.84 volts
Explanation:
Let Vo to be the voltage level of the signal,
Therefore,
Vo = 120{0.5(0) + 0.25(1) + 0.125(0) + 0.0625 (1) + 0.03125(0)
+ 0.015625(1) + 0.007812(0) +0.003906(1)}
Vo= 39.84 volts
Answer:
its bad and to drive drunk is even worse
Answer:
The symbols are to be noted on the title sheet or other introductory sheet of the plans.
Explanation:
in able to be understood for example a map key is always on a map so the reader can use it efficently without confusion
Yes i is the time of the day you get to frost the moon and back and then you can come over and then go to hang out with me me and then go to hang out
