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3 years ago

Which of the following was a sustainable power source used during the Middle Ages?

Engineering

2 answers:

spin [16.1K]3 years ago

7 0

The answer is windmill it was used for electricity

muminat3 years ago

3 0

The windmill was a power source used during the Middle Ages to supply power to churches, homes, outside stores, and many more. Hopefully this helped :) have a wonderful day!!

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Estimate the quantity of soil to be excavated from the borrow pit

Serggg [28]

Answer

1056

Explanation:

for example

A soil is to be excavated from a borrow pit which has a density of 1.75g/cc and water content of 12%. The G is 2.7 the soil is compacted to that water content of 18% and dry density of 1.65g/cc. for 1000 m3 of soil used in fill estimate

Quantity of soil to be excavated from pit in m3

6 0

3 years ago

Draw a FBD of the beam with reactions at A & B. A is a pin, B is a roller. Try to guess intuitively which way the vertical c

Vesnalui [34]

Answer:

kindly check the drawing of the FBD of the beam with reactions at A & B. A is a pin, B is a roller in the attached picture.

Explanation:

Without further ado, let's dive straight into the solution to the question above. From the diagram of the FBD of the beam with reactions at A & B it can be shown that the reaction moment is anticlockwise while the moment is clockwise.

The system is at equilibrium and the it does not matter where you place the couple (pure) moment.

The distance from A to C can either be equal or not. If AY = 2.15 kN and M = 25.8. Then, the distance between A and B = 25.8/2.15 = 12m.

5 0

3 years ago

An aluminum alloy tube with an outside diameter of 3.50 in. and a wall thickness of 0.30 in. is used as a 14 ft long column. Ass

slega [8]

Answer:

slenderness ratio = 147.8

buckling load = 13.62 kips

Explanation:

Given data:

outside diameter is 3.50 inc

wall thickness 0.30 inc

length of column is 14 ft

E = 10,000 ksi

moment of inertia $= \frac{\pi}{64 (D_O^2 -D_i^2)}$

$I = \frac{\pi}{64}(3.5^2 -2.9^2) = 3.894 in^4$

Area $= \frac{\pi}{4} (3.5^2 -2.9^2) = 3.015 in^2$

$radius = \sqrt{\frac{I}{A}}$

$r = \sqrt{\frac{3.894}{3.015}$

r = 1.136 in

slenderness ratio $= \frac{L}{r}$

$= \frac{14 *12}{1.136} = 147.8$

buckling load $= P_cr = \frac{\pi^2 EI}}{l^2}$

$P_{cr} = \frac{\pi^2 *10,000*3.844}{( 14\times 12)^2}$

$P_{cr} = 13.62 kips$

3 0

3 years ago

What device may be used to ensure that air is flowing through a duct before an electric strip is energized

andriy [413]

Answer:

Most commonly used air flow proving interlocks are:

differential pressure air flow switch. Contact changes state based on duct static vs. atmosphere outside the duct or dp across a fan inlet to outlet
CT relay. Current transformer relay that changes state from 0 to 1 open/closed when amp draw on a blower motor exceeds the trip setpoint.

Explanation:

4 0

3 years ago

You apply a force of 19 lbs on to the end of a lever to lift a crate. The resistance of the load is 106 lbs. Calculate the

zhuklara [117]

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3 0

3 years ago