1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
yKpoI14uk [10]
3 years ago
10

^^ help :c

Physics
1 answer:
ipn [44]3 years ago
6 0
I need help to I have a test and I need help to
You might be interested in
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 385 kV. The secondary of
enot [183]

Answer:

a) In the new transformer there are 42 turns in the secondary per turn in the primary, while in the old transformer there were 32 turns per turn in the primary.

b) The new output is 86% of the old output

c) The losses in the new line are 74% the losses in the old line.

Explanation:

a) To relate the turns of primary and secondary to the ratio of voltage we have this expression:

\frac{n_1}{n_2}=\frac{V_1}{V_2}

In the old transformer the ratio of voltages was:

\frac{n_1}{n_2}=\frac{V_1}{V_2}=\frac{12}{385} =0.03117\\\\n_2=n_1/0.03117=32.1n_1

In the new transformer the ratio of voltages is:

\frac{n_1}{n_2}=\frac{V_1}{V_2}=\frac{12}{500} =0.024\\\\n_2=n_1/0.24=41.7n_1

In the new transformer there are 42 turns in the secondary per turn in the primary, while in the old transformer there were 32 turns per turn in the primary.

b) The new current ratio is

\frac{V_1}{V_2}=\frac{I_2}{I_1}=\frac{12}{500}= 0.024\\\\I_2=0.024I_1

If the old current output was 425 kV, the ratio of current was:

\frac{V_1}{V_2}=\frac{I_2}{I_1}=\frac{12}{425}= 0.028\\\\I_2=0.028I_1

Then, the ratio of the new output over the old output is:

\frac{I_{2new}}{I_{2old}} =\frac{0.024\cdot I_1}{0.028\cdot I_1}= 0.86

The new output is 86% of the old output (smaller output currents lower the losses on the transmission line).

c) The power loss is expressed as:

P_L=I^2\cdot R

Then, the ratio of losses is (R is constant for both power losses):

\frac{P_n}{P_o} =\frac{I_n^2R}{I_o^2R} =(\frac{I_n}{I_o} )^2=0.86^2=0.74

The losses in the new line are 74% the losses in the old line.

7 0
3 years ago
A boy weighing 50 kg is running at 2m/s. What is its kinetic energy? *<br> 10 points
pentagon [3]
The answer is 100.
The formula is KE = 1/2mv^2
Then you plug in 50 to the m
And 2 to the v . That’s how I got 100 .
Hope this helps
8 0
3 years ago
A 4000kg truck has a head-on inelastic collision with a 2500kg truck.
iogann1982 [59]

Answer:it could be B

Explanation:

im not sure

7 0
3 years ago
Which of the following statements about a metal wire in equilibrium are true? Select all that apply. There cannot be excess char
olga_2 [115]

Answer:

There may be excess charges in the interior of the wire

The net electric field everywhere inside the wire is zero

The interior of the metal wire is neutral.

There may be excess charges on the surface of the wire.

There is no net flow of mobile electrons inside the wire.

Explanation:

For any metal wire in equilibrium position, there may be excess charges in the interior of the wire and the net electric field everywhere inside the wire is zero. Additionally, the interior of the metal wire is always neutral and there is likely to be excess charges on the surface of the wire. Moreover, it's important to note that for a metal wire in equilibrium, there is no net flow of mobile electrons inside the wire.

3 0
3 years ago
Which characteristics is common to renewable energy resources?
Marrrta [24]
Renewable Energy resources can easily be produced as soon as they are used.

It is sufficient in supply and it is produced easily within a relatively short time.

Example are: Solar Energy , Wind Energy, Hydro Energy.   

4 0
3 years ago
Other questions:
  • Ann is driving down a street at 64 km/h.
    5·2 answers
  • Which of the following statements best describes ergonomics?
    10·2 answers
  • Light of a single frequency falls on a photo-electric material but no electrons are emitted . Electrons may be emitted if the __
    11·1 answer
  • Which is heavier, humid air or dry air ?
    5·1 answer
  • Match the half life and time information to the percentage of radioactive isotope left.
    12·1 answer
  • A body is dropped from a height of 30m. What is the velocity of the body after it has covered a distance of 20 m? (Given g= 10 m
    6·2 answers
  • How does a solenoid convert energy from one form to another?​
    14·1 answer
  • Which of the following types of electromagnetic radiation has the most energy?
    12·2 answers
  • By what factor is the self-inductance of an air solenoid changed if its length and number of coil turns are both tripled
    14·1 answer
  • Scientific theories are deductive in nature.?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!