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3 years ago

Khi mở máy động cơ dây chảy cầu chì phải

2 answers:

6 0

I will mark brainlist please help

1) Businesses often call their stores and warehouses bricks and clicks.

• true

• false

2) Start-up is a newly formed business that is usually small

• true

• false

3) Some people find that purchasing an e-ticket is easier and cheaper than visiting an actual store.

• true

• false

4) multi-channel retailer is a business that sells its good or services in stores, by mail, and online.

• true

• false

5) An e-tail store sells products over the internet through the workforce

• true

• false

creativ13 [48]3 years ago

5 0

Can you say this in English please

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Convert the following pairs of voltage and current waveforms to phasor form. Each pair of waveforms corresponds to an unknown el

exis [7]

Answer:

a) V = 20 ∠30⁰ , I = 4 ∠-210⁰ Z inductive L = 0,0125 H

b) V = 9∠-60⁰ , I = 4 ∠ 190⁰ Z capacitive C = 4,94 *10⁻⁴ F

c) V = 13 ∠240⁰ , I = 7 ∠ 150⁰ Z Inductive L = 0,0074 H

Explanation:

a) v(t) = 20 cos (400*t + 30 )

Phasor form V = 20 ∠30⁰

i(t) = 4 sin (400*t - 120)

First we need to transform 4sin( 400t - 120 ) as function cosine

we know that sin ( x + 90 ) = cos x

Then sin ( 400*t -120 ) = cos ( 400*t - 120 -90 ) = cos ( 400t - 120 - 90)

Phasor form I = 4 ∠-210⁰

To have the impedance nature we compute

Z = V / I ⇒ Z = 20 ∠30⁰ / 4 ∠-210⁰ Z = 5 ∠-180⁰

We notice that voltage advances the current then we are in presence of an inductive impedance

5 = wl ⇒ 5 = 400 *L ⇒ L = 0,0125 H

b) v(t) = 9 cos ( 900t - 60 )

V = 9∠-60⁰

i(t) = 4 sin ( 900t + 280 ) ⇒ i(t) = 4 cos ( 900t + 280 - 90)

i(t) = 4 cos (900t + 190 ) ⇒ I = 4 ∠ 190⁰

Z = V/I ⇒ Z = 9∠-60⁰ / 4 ∠ 190⁰ Z = 2,25 ∠-250

In this case the current advances the voltage. Impedance capacitive

1/wc = 1/ 900*C 1/wc = Z ⇒ 2,25 = 1/ 900*C

2,25*900 = 1/C ⇒ 2025 =1/C ⇒ C = 4,94 *10⁻⁴ F

c) v(t) = - 13 cos ( 250t + 60 )

v(t) = 13 cos ( 250t + 60 +180 ) ⇒ v(t) = 13 cos ( 250t +240)

Phasor Form

V = 13 ∠240⁰

i(t) = 7 sin (250t + 240 - 90) ⇒ i(t) = 7 sin (250t + 150)

Phasor Form I = 7 ∠150⁰

Z = 13∠240⁰ / 7 ∠150⁰ ⇒ Z = 1,86 ∠ 90⁰

Voltage advances the current then the impedance is inductive

wl = 250L 250 L = 1,86 L = 1,86/250 L = 0,0074 H

7 0

3 years ago

Question 2

ValentinkaMS [17]

Answer:

r h ch y TC GG ch hh h h

No se

Explanation:

No seibibk h j h uh t t t

3 0

2 years ago

When its 100-hp engine is generating full power, a small airplane with mass 700 kggains altitude at a rate of 2.5 m/s. What frac

snow_lady [41]

For the given problem it is necessary to recap the concepts about Power, that is, is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time.

The equation for power can be written as

$P = FV$

Where,

F= Net Force

V =Velocity

By the second newton law, force can be:

F = mg

Where m means the mass and g the gravity acceleration.

We can also write the equation as,

P = mgv

Replacing the values

P = 700*9.8*25

P = 17.15kW

Tenemos unidades en dos sistemas diferentes, por lo que convertimos los HP a Sistema internacional y tenemos que

1hp = 0.746kW

Then the fraction $\eta$ is,

$\eta = \frac{17.15kW}{0.746kW}$

$\eta = 22.989$

Therefore the fraction of the engine power is being used to make the airplane climb is 22.984%

5 0

3 years ago

How do we infer that there is

Katena32 [7]

Answer:

Not too far removed from Collingwood’s concern with the elimination of physical and moral force via social civilization are accounts of civilized society concerned with the management of violence, if only by removing it from the public sphere. Such a concern is extended in Zygmunt Bauman’s account of civilization to the more general issue of producing readily governable subjects. The “concept of civilization,” he argues, “entered learned discourse in the West as the name of a conscious proselytising crusade waged by men of knowledge and aimed at extirpating the vestiges of wild cultures” (1987, 93).

This proselytizing crusade in the name of civilization is worth considering further. Its rationale is not too difficult to determine when one considers Starobinski’s (1993, 31) assertion: “Taken as a value, civilization constitutes a political and moral norm. It is the criterion against which barbarity, or non-civilization, is judged and condemned.” A similar sort of argument is made by Pagden (1988, 33), who states that civilization “describes a state, social, political, cultural, aesthetic—even moral and physical—which is held to be the optimum condition for all mankind, and this involves the implicit claim that only the civilized can know what it is to be civilized.” It is out of this implicit claim and the judgments passed in its name that the notion of the “burden of civilization” was born. And this, many have argued, is one of the less desirable aspects and outcomes of the idea of civilization

6 0

3 years ago

Pleaseeee help me with this!!

lilavasa [31]

Can you add a picture??

3 0

3 years ago