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kirza4 [7]
3 years ago
11

When plotting a single AC cycle beginning at zero degrees and moving forward in time the cycles negative peak occurs at

Engineering
1 answer:
Lana71 [14]3 years ago
4 0

Answer:A 270 degrees

Explanation:

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A helicopter moves horizontally in the x direction at a speed of 120 mi/h. Knowing that the main blades rotate clockwise when vi
devlian [24]

Answer:

The instantaneous axis of rotation=

x = 0 ; z = 8.4 ft

Explanation:

Given:

Speed of helicopter, Vo= 120 mi/h, converting to ft/sec, we have:

\frac{5280 * 120}{60*60}

= 176 ft/s

Angular velociyy, w = 220 rpm, converting to rad/sec, we have: \frac{200*2*pi}{60} =20.95 rad/s

The helicopter moves horizontally in the x direction at a speed of 120 mi/h, this means that the helicopter moves in the positive x direction at 120mi/h

To find the instantaneous axis of rotation of the main blades, we have:

Where Vc = 20.95 rad/s

Vo = 176 ft/s

z = \frac{V_0}{V_c} = \frac{176ft/s}{20.95rad/s}

= 8.4 ft

Therefore the axis of rotation=

x = 0 ; z = 8.4 ft

4 0
3 years ago
Thank you,Thank you udahfsdf
Degger [83]

Answer: Um, a little feedback would help, cause I'm new but if you are thanking someone, let me know and i'll thank them for you, any other questions?

Explanation:

3 0
3 years ago
For laminar flow over a hot flat plate, the local heat transfer coefficient decreases with distance because (select all that are
kotegsom [21]

Answer:

B. The thickness of the heated region near the plate is increasing.

Explanation:

First we know that, a boundary layer is the layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant. The fluid is often slower due to the effects of viscosity. Advection i.e the transfer of heat by the flow of liquid becomes less since the flow is slower, thereby the local heat transfer coefficient decreases.

From law of conduction, we observe that heat transfer rate will decrease based on a smaller rate of temperature, the thickness therefore increases while the local heat transfer coefficient decreases with distance.

3 0
4 years ago
2. The metal to be welded is called the
Sveta_85 [38]

Answer:

I believe the answer is "filler metal"

5 0
3 years ago
A force of 250 N is acting on an area of 2 m2. The pressure is therefore:
lianna [129]

Answer:

125 Pascal

Explanation:

We know that

Pressure=\frac{Force}{Area}

Applying given values we get

Pressure=\frac{250N}{2m^{2}}

Pressure=125\frac{N}{m^{2}}

Pressure = 125 Pascal

7 0
3 years ago
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