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2 years ago

A distância entre duas retas reversas é a medida de um segmento orientado que *?

Engineering

1 answer:

Agata [3.3K]2 years ago

8 0

Answer:

Fatec – SP) Seja A um ponto pertencente à reta r, contida no plano α. É verdade que:

a) existe uma única reta que é perpendicular à reta r no ponto A.

b) existe uma única reta, não contida no plano α, que é paralela à reta r.

c) existem infinitos planos distintos entre si, paralelos ao plano α, que contém a reta r.

d) existem infinitos planos distintos entre si, perpendiculares ao plano α e que contêm a reta r.

e) existem infinitas retas distintas entre si, contidas no plano α e que são paralelas à reta r.

2. (UF – AL) Classifique como verdadeira ou falsa cada uma das afirmativas abaixo.

1) Duas retas que não têm pontos com

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If you see rough patches, loose gravel, or potholes on the road, you should ______.l

Black_prince [1.1K]

Avoid them because they can cause you to lose traction.

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2 years ago

All of these are true about GMA (MIG) welding EXCEPT that:

Hatshy [7]

Answer:

the welding gun liner regulates the shielding gas.

Explanation:

The purpose of the welding gun liner is to properly position the welding wire from the wire feeder till it gets to the nozzle or contact tip of the gun. <em>Regulation of the shielding gas depends on factors such as the speed, current, and type of gas being used. </em>In gas metal arc welding, an electric arc is used to generate heat which melts both the electrode and the workpiece or base metal.

The electric arc produced is shielded from contamination by the shielding gas. The heat generated by the short electric arc is low.

3 0

1 year ago

To find the reactance XLXLX_L of an inductor, imagine that a current I(t)=I0sin(ωt)I(t)=I0sin⁡(ωt) , is flowing through the indu

Sophie [7]

Answer:

V(t) = XLI₀sin(π/2 - ωt)

Explanation:

According to Maxwell's equation which is expressed as;

V(t) = dФ/dt ........(1)

Magnetic flux Ф can also be expressed as;

Ф = LI(t)

Where

L = inductance of the inductor

I = current in Ampere

We can therefore Express Maxwell equation as:

V(t) = dLI(t)/dt ....... (2)

Since the inductance is constant then voltage remains

V(t) = LdI(t)/dt

In an AC circuit, the current is time varying and it is given in the form of

I(t) = I₀sin(ωt)

Substitutes the current I(t) into equation (2)

Then the voltage across inductor will be expressed as

V(t) = Ld(I₀sin(ωt))/dt

V(t) = LI₀ωcos(ωt)

Where cos(ωt) = sin(π/2 - ωt)

Then

V(t) = ωLI₀sin(π/2 - ωt) .....(3)

Because the voltage and current are out of phase with the phase difference of π/2 or 90°

The inductive reactance XL = ωL

Substitute ωL for XL in equation (3)

Therefore, the voltage across inductor is can be expressed as;

V(t) = XLI₀sin(π/2 - ωt)

3 0

2 years ago

The density of a liquid is to be determined by an old 1-cm-diameter cylindrical hydrometer whose division marks are completely w

vodka [1.7K]

Answer:

The density of the unknown liquid is 1.025 kg/m³ (considering the density of the water as 1.000 kg/m³)

Explanation:

The hydrometer works by the Archimedes principle. The cylinder floats in the liquid because the hydrostatic thrust is equal to the weight force. This means:

$Tr-W=0N\\Tr=W\\\delta_{fl} \cdot Vol \cdot g =W_{hydr}$

If we measure 2 fluids, the weight of the hydrometer is the same, so:

$\delta_{fl1} \cdot Vol_1 \cdot g =W_{hydr}=\delta_{fl2} \cdot Vol_2 \cdot g\\\delta_{fl1} \cdot Vol_1 =\delta_{fl2} \cdot Vol_2\\\delta_{fl1} H_1 \pi R^2 =\delta_{fl2} H_2 \pi R^2\\\delta_{fl1}\frac{H_1}{H_2}=\delta_{fl2}$

If the original watermark height is 12.3cm (H₁) and the mark for water has risen 0.3 cm above the unknown liquid–air interface, the height of the unknown liquid mark is 12cm (H₂). Therefore:

$delta_{fl1}\frac{H_1}{H_2}=\delta_{fl2}\\1.000\frac{kg}{m^3} \frac{12.3cm}{12cm}=\delta_{fl2}=1.025\frac{kg}{m^3}$

8 0

2 years ago

Consider the following program:

EleoNora [17]

Answer:

The solution of this question is given below in explanation section.

Explanation:

The correct answer to this question is A i.e. 112002 .

the correct code of this question is given below

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

//#include "csapp.h"

void end(void)

{

printf("2");

}

int main()

{

if (fork() == 0)

atexit(end);

if (fork() == 0)

printf("0");

else

printf("1");

exit(0);

}

/* $end forkprob2 */

when you run this program, fork function print different values.

However, it is noted that when you run the program repeatedly, it will show you different values. But the most possible value that this program will show is A.

The picture is attached of the running program to get the idea of code.

5 0

2 years ago