) The intake to a hydraulic turbine (not drawn to scale) installed in a dam is located at an elevation of 10 m above the turbine exit. Water enters at 20 degrees C with negligible velocity and exits from the turbine at 10 m/s. The water passes through the turbine with no significant changes in temperature or pressure between the inlet and exit, and heat transfer is negligible. The acceleration of gravity is constant at g = 9.81 m/s2. If the power output at steady state is 500 kW, what is the mass flow rate of water in kg/s?

5.1 kg/s

Explanation:

From the question, the following parameters are given:

Velocity V = 10 m/s

Height h = 10 m

Acceleration due to gravity g = 9.8m/s^2

Power = 500 Kw

From definition of power,

Power = WD / time

Where WD = force × distance

Substitute all the parameters into the formula

500 = (F × 10)/ t

But F = mg

500 = (mg × 10)/t

Rearrange the formula

500 = m/t × 9.8 × 10

Where m/t is the mass flow rate of water in kg/s

500 = m/t × 98

m/t = 500/98

m/t = 5.102 kg/s

Therefore, the mass flow rate of water is 5.1 kg/s

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia