The circuit you should use to find the open-circuit voltage is

Answers

Answer 1
Answer:

Answer:

Incomplete questions check attachment for circuit diagram.

Explanation:

We are going to use superposition

So, we will first open circuit the current source and find the voltage Voc.

So, check attachment for open circuit diagram.

From the diagram

We notice that R3 is in series with R4, so its equivalent is given below

Req(3-4) = R3 + R4

R(34) = 20+40 = 60 kΩ

Notice that R2 is parallel to the equivalent of R3 and R4, then, the equivalent of all this three resistor is

Req(2-3-4) = R2•R(34)/(R2+R(34))

R(234) = (100×60)/(100+60)

R(234) = 37.5 kΩ

We notice that R1 and R(234) are in series, then, we can apply voltage divider rule to find voltage in R(234)

Therefore

V(234) = R(234) / [R1 + R(234)] × V

V(234) = 37.5/(25+37.5) × 100

V(234) = 37.5/62.5 × 100

V(234) = 60V.

Note, this is the voltage in resistor R2, R3 and R4.

Note that, R2 is parallel to R3 and R4. Parallel resistor have the same voltage, then voltage across R2 equals voltage across R34

V(34) = 60V.

Now, we also know that R3 and R4 are in series,

So we can know the voltage across R4 which is the Voc we are looking for.

Using voltage divider

V4 = Voc = R4/(R4 + R(34)) × V(34)

Voc = 40/(40+60) × 60

Voc = 24V

This is the open circuit Voltage

Now, finding the short circuit voltage when we short circuit the voltage source

Check attachment for circuit diagram.

From the circuit we notice that R1 and R2 are in parallel, so it's equivalent becomes

Req(1-2) = R1•R2/(R1+R2)

R(12) = 25×100/(25+100)

R(12) = 20 kΩ

We also notice that the equivalent of Resistor R1 and R2 is in series to R3. Then, the equivalent resistance of the three resistor is

Req(1-2-3) = R(12) + R(3)

R(123) = 20 + 20

R(123) = 40 kΩ

We notice that, the equivalent resistance of the resistor R1, R2, and R3 is in series to resistor R4.

So using current divider rule to find the current in resistor R4.

I(4) = R(123) / [R4+R(123)] × I

I(4) = 40/(40+40) × 8

I(4) = 4mA

Then, using ohms law, we can find the voltage across the resistor 4 and the voltage is the required Voc

V = IR

V4 = Voc = I4 × R4

Voc = 4×10^-3 × 40×10^3

Voc = 160V

Then, the sum of the short circuit voltage and the open circuit voltage will give the required Voc

Voc = Voc(open circuit) + Voc(short circuit)

Voc = 24 + 160

Voc = 184V.


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What is the unit of measurement for power?A. m/s2
B. watts
C. joules
D. newtons

Answers


Power is the rate of doing work or using energy.

The unit of power is the watt.

         1 watt  =  1 joule per second
 

Train is traveling at an initial velocity of 68.325m/s. After 23.75 seconds it speeds up to a final velocity of 79.32m/s. What is the train's acceleration during this time

Answers

So,

We know that:
acceleration =  ( final\ velocity\ -\ initial\ velocity)/(time)

Plug in the values.
acceleration =  (79.32 m/s^(2)\ -\ 68.325m/s^(2))/(23.75 secs)
acceleration =  (10.995m/s^(2) )/(23.75 secs)
acceleration = 0.4629 m/s^(2)

What happens in a chemical reaction?

Answers

When two or more molecules interact and the molecules change. Bonds between atoms are broken down and created to form new molecules.
 As the chemical bonds are broken, the positions of electrons change, resulting in a product with properties that are different from the properties of the reactants. Various temperatures and catalysts are needed for different chemical reactions to occur. During a chemical reaction, new substances are produced as existing bonds are broken, atoms are rearranged, and new bonds are formed.

if a free falling rock were equipped with a speedometer, by how much would it's speed readings increase with each second IF it were on a planet where g= 20 m/s^2? would it be 60?

Answers

accelleration(a) is changing of velocity in second.
free fall a = g
speed increase = a = g = 20 (m/s) / s

A whale comes to the surface to breathe and then dives at an angle of 20.0 ∘ below the horizontal. If the whale continues in a straight line for 200 m , how deep is it?

Answers

Answer:

The depth is 68.4 meters.

Explanation:

In this question the whale rose to the surface of the ocean to breath and then dives into the ocean at an angle of 20° below the horizontal line. It then travels 200 m straight along this line. We have to determine the depth of the ocean.

The path of the whale forms the hypotenuse of a right triangle and the angle between the hypotenuse and base is given as 20°.  Determination of sides or angles in a right triangle can be determines using trigonometry.  

sinθ = ((opposite \ side))/(hypotenuse)

opposite side = sinθ* hypotenuse

Here θ = 20°  

sinθ = sin(20°) = 0.342

opposite side= 0.342 * 200 = 68.4 m  

Hence the depth is 68.4 m.

Answer:

It is 68.404 m deep.

Explanation:

The motion of the whale can be seen in the form of a right-angle triangle.

Angle of deviation = 20°

We know that, sinФ = Perpendicular/ Hypotenuse.

Here, hypotenuse = 200 m

Depth is perpendicular that we have to find.

sin(20°) = Depth/200

Depth = sin(20°) * 200 = 68.404 meters.

Alvin and Theodore race across a parkinglot 360 cm long. Alvin travels at 22.03 cm/s
and Theodore at 17 cm/s.
When the Alvin crosses the finish line, how
far behind is Theodore?
Answer in units of cm.

Answers

Theodore will cross 82.2 cm behind Alvin