Answer:
The volume air flow rate is
The output of the fan is 0.446 hp
Solution:
As per the question:
Diameter of the round duct, d = 0.30 m
Radius of the duct, R =
Pressure of the opening, P = 2.5 cm of water = 0.025 m of water
P =
Density of air,
Now, the velocity, v can be calculated as:
Now,
Volume rate of air flow is given by:
Now,
1 ft = 3.2808 m
Now, the output of the fan in horsepower (hp):
Power output, P' =
Now,
1 hp = 746 W
P' (in hp) =
It’s less then one
Effectiveness of heat exchanger is defined as the ratio of actual heat transfer rate to the maximum possible heat transfer rate. Since the actual heat transfer is always less than maximum possible heat transfer effectiveness is always less than one
Answer:
9mm tube
Explanation:
Given data:
Outer diameter = 90-mm therefore outer radius ( R ) = 90/2 = 45-mm
centric load = 120kN
wall thickness of tubes = 3mm from 6 mm to 15 mm
length of column = 2.25 m
Inner radius ( r ) = 45 - 6 = 39-mm
<u>Determine the lightest tube to be used </u>
we calculate the area of the column = 1.593 * 10^-3 m^2
next we determine the moment of Inertia = 1.4036 * 10^-6 m^4
determine radius of Gyration = 0.02977 m
slenderness ratio = 75.57
Allowable stress = 65.14
Allowable load = ( allowable stress * Area ) = (65.14 * 10^6 * 1.583 * 10^-3) = 103.12 kN
Attached below is a detailed solution
In order to make the right choice the given value Pall will be greater than 120Kn hence we will use 9mm thickness as the lightest tube
Sound requires a medium to travel. Sound cannot travel in vacuum in space while light can. Therefore, the receiver from earth receives only light sent from moon, not sound.
Explanation:
- Sound is created by vibrations that requires medium to travel. The medium can be solid, liquid, or gas. Whatever it is, a medium is required.
- In space, there is no solid, liquid, or gas. In other words, it is vacuum. Sound waves cannot travel through vacuum.
- Light waves, on the other hand, can travel through vacuum. Hence, if the transmitter on moon emits sound waves and light waves, receiver from earth picks only the light waves.
Answer:
give the question in English it'd be understandable