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3 years ago

Answer the following either true (T) or false (F) (5 pts)

Engineering

1 answer:

likoan [24]3 years ago

6 0

Answer:

1. True

2. True

3. False

Explanation:

The office location is where the soil layer is not uniform. The thickness of the soil varies which could lead to doors being jammed. The engineer needs to estimate the differential in clay soil.

The inclined surface can hold less weight than a vertical surface. The capacity to hold the weight is due to the gravitational force which is exerted to the load.

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Which is an example of a passive solar energy system

Dafna1 [17]

Stone or concrete contraptions

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3 years ago

A series R-L circuit is given. Circuit is connected to an AC voltage generator. a) Derive equations for magnitude and phase of c

igomit [66]

Answer:

The equations for magnitude and phase of current and voltages on resistor and inductor are:

$I=\frac{V_m}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)$

$V_R=I\cdot Z_R=\frac{V_m \cdot R}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)$

$V_L=I\cdot Z_L=\frac{V_m \cdot (\omega L)}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)+90^{\circ}$

Explanation:

The first step is to find the impedances of the resistance (R) and the inductor (L).

The impedance of the resistor is:

Rectangular form: $Z_R=R$
Polar form: $Z_R=R\angle 0^{\circ}$

The impedance of the inductor is:

Rectangular form: $Z_L=j\omega L$

Polar form: $Z_L=\omega L \angle 90^{\circ}$

Where $\omega$ is the angular frequency of the source, and the angle is $90^{\circ}$ because a pure imaginary number is on the imaginary axis (y-axis).

The next step is to find the current expression. It is the same for the resistor and inductor because they are in series. The total impedance equals the sum of each one.

$I=\frac{V}{Z_R+Z_L}$

It is said that $V=V_m\angle \theta$ , so, the current would be:

$I=\frac{V_m\angle \theta }{R+j\omega L}$

The numerator must be converted to polar form by calculating the magnitude and the angle:

The magnitude is $\sqrt{R^2+(\omega L)^2}$
The angle is $tan^{-1}(\omega L / R)$

The current expression would be as follows:

$I=\frac{V_m\angle \theta }{\sqrt{R^2+(\omega L)^2}\, \angle tan^{-1}(\omega L / R)}$

When dividing, the angles are subtracted from each other.

The final current expression is:

$I=\frac{V_m}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)$

The last step is calculating the voltage on the resistor $V_R$ and the voltage on the inductor $V_L$ . In this step the polar form of the impedances could be used. Remember that $V=I\cdot Z$ .

(Also remember that when multiplying, the angles are added from each other)

Voltage on the resistor $V_R$

$V_R=I\cdot Z_R=\bigg( \frac{V_m}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)\bigg) \cdot (R\angle 0^{\circ})$

The final resistor voltage expression is:

$V_R=I\cdot Z_R=\frac{V_m \cdot R}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)$

Voltage on the inductor $V_L$

$V_L=I\cdot Z_L=\bigg( \frac{V_m}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)\bigg) \cdot (\omega L \angle 90^{\circ})$

The final inductor voltage expression is:

$V_L=I\cdot Z_L=\frac{V_m \cdot (\omega L)}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)+90^{\circ}$

Summary: the final equations for magnitude and phase of current and voltages on resistor and inductor are:

$I=\frac{V_m}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)$

$V_R=I\cdot Z_R=\frac{V_m \cdot R}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)$

$V_L=I\cdot Z_L=\frac{V_m \cdot (\omega L)}{\sqrt{R^2+(\omega L)^2}}\angle \theta - tan^{-1}(\omega L / R)+90^{\circ}$

6 0

4 years ago

Two factors that can be modified to optimize the cutting processes are feed and depth, and cutting velocity. a) True b) False

Kisachek [45]

Answer:

True

Explanation:

The process of cutting is used to cut an object with the help of physical forces.

This process includes cutting like shearing, drilling, etc.

The cutting process makes use of the mechanical tools to maintain the contact of cutter with the object.

This process can be optimized by modification of the cutting depth, cutting velocity and feed.

The process optimization also depends on the cutting fluid as these are the deterministic factors for the cutting condition.

4 0

3 years ago

The pressure drives the piston downward on the power stroke, causing the crankshaft to turn. *

jenyasd209 [6]

Answer:

the answer is true

Explanation:

8 0

3 years ago

Read 2 more answers

A 2D drawing, which shows how a building looks from the top (at imaginary cut line 4’ above the foundation) is called a(n): A. P

insens350 [35]

Answer:

A. Plan (or more commonly called floor plan)

Explanation:

My textbook

5 0

3 years ago