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3 years ago

11

Although most magnetic reversing starters provide mechanical interlock protection, some circuits are provided with a secondary b

ackup or safety backup system that uses auxiliary contacts to provide ___ interlocking.

1 answer:

ioda3 years ago

4 0

Answer:

To provide electrical interlocking

Explanation:

Electrical interlocking involves interconnecting the motor circuit in a manner that the second motor will not start until the first one begins, same goes for the third motor which would not run unless the second one runs and it continues in that sequence.

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The voltage V in a circuit that satisfies the law V = IR is slowly dropping as the battery wears out. At the same time, the resi

Anastasy [175]

Answer:

$-0.5\times 10^{-4} A/s$

Explanation:

We are given that

$\frac{dV}{dt}=-0.01 V/s$

R=600 ohms

I=0.04 A

$\frac{dR}{dt}=0.5ohm/s$

$V=IR$

$\frac{dV}{dt}=\frac{\partial V}{dI}\frac{dI}{dt}+\frac{\partial V}{dR}\frac{dR}{dt}$

$\frac{dV}{dt}=R\frac{dI}{dt}+I\frac{dR}{dt}$

Substitute the values

$-0.01=600\times \frac{dI}{dt}+0.04\times 0.5$

$-0.01-0.04\times 0.5=600\frac{dI}{dt}$

$-0.03=600\frac{dI}{dt}$

$\frac{dI}{dt}=\frac{-0.03}{600}=-0.5\times 10^{-4}A/s$

5 0

4 years ago

Not so fast! If a force of 2500 N is used over

Masteriza [31]

Answer:

B 1500N

Explanation:

The acceleration of the car - at least the average one, but that will do, is $a= \frac{\Delta v}{\Delta t} = \frac 53 ms^{-2} = 1.66 ms^{-2}$

We know the acceleration, we know the force, let's drop them in Newton second law.

$F= ma = 2500= m \frac53 \rightarrow m=500\times 3 N = 1500N$

3 0

3 years ago

Sound of thunder is heard 5 seconds after the flash of lightning is seen.How far away was the lightning flash? Note that sound t

elena55 [62]

Answer:

The distance covered by the lighting flash is 1700 meters.

Explanation:

Given that,

The speed of sound travels in air at a speed of about 340 meter second, v = 340 m/s

The sound of thunder is heard 5 seconds after the flash of lightning is seen, t = 5 s

To find,

The distance far away was the lightning flash.

Solution,

The distance covered by the lighting flash is given by the product of speed and time. It is given by :

$d=v\times t$

$d=340\ m/s\times 5\ s$

d = 1700 meters

So, the distance covered by the lighting flash is 1700 meters. Therefore, this is the required solution.

3 0

4 years ago

A 0.20-f capacitor is desired. what area must the plates have if they are to be separated by a 3.2-mm air gap?

Igoryamba

Air gap means that the dielectric is air.

So <span>ε0 = </span><span>8.85 x 10^-12 [F/m].......................permitivity of free space

Lets use the equation

</span>C= ( ε0x A) / d

Where A is the area of the plate

And d the distance between the plates

d = <span>3.2-mm = 3.2 E-3 m

so ............> A = C *d /</span>ε0 = 0.20 F * 3.2 E-3 m / 8.85 x 10^-12 [F/m]

A = 7.23 E 7 [m2]

5 0

3 years ago

Read 2 more answers

A dog sees a flowerpot sail up and then back past a window 5.0 ft high. If the total time the pot is in sight is 1.0 seconds, fi

Kisachek [45]

To solve this problem we will use the linear motion kinematic equations for which acceleration (in this case gravity) is described as the change in velocity in an instant of time. Subsequently through the energy conservation equations we will find the net height.

Let's start considering that the time is 1 second, therefore,

$t = 1s$

Now the acceleration would be given as

$g = \frac{\Delta v}{t}$

$g = \frac{v_f-v_i}{t}$

$v_f-v_i = gt$

Since the final speed is zero, and the time elapsed to reach the height is 0.5 seconds (half of the entire route) we will have that the initial speed can be expressed in terms of gravity as

$0-v_i = g(\frac{1}{2})$

$v_i = \frac{1}{2} g$

Now for energy conservation, the potential energy must be equal to the kinetic energy, therefore,

PE = KE

$mgh = \frac{1}{2} mv_i^2$

$h = \frac{v_i^2}{2g}$

Replacing the previous value found,

$h = \frac{1}{4} \frac{g^2}{2g}$

$h = \frac{1}{4} \frac{9.8^2}{2(9.8)}$

$h = 1.225m$

Therefore the hegiht above the windows that the pot rises is 1.225m

4 0

3 years ago