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
german
3 years ago
10

What is a electromagnet?

Physics
2 answers:
Art [367]3 years ago
7 0
An electromagnet is a soft metal core which is made into a magnet by passing the electric current through a coil which is surrounding it.
Marysya12 [62]3 years ago
5 0
A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
You might be interested in
A ship travels with velocity given by 12, with current flowing in the direction given by 11 with respect to some co-ordinate axe
nataly862011 [7]

Answer:

v_x = 11.78 m/s

Explanation:

Velocity of the ship is given as

v = 12 units

the direction of the velocity of the ship is making an angle of 11 degree with the current

so we will have two components of the velocity

1) along the direction of the current

2) perpendicular to the direction of the current

so here we know that the component of the ship velocity along the direction of the current is given as

v_x = v cos\theta

v_x = 12 cos11

v_x = 11.78 m/s

7 0
3 years ago
A heat engine has a maximum possible efficiency of 0.780. If it operates between a deep lake with a constant temperature of-24.8
Volgvan

Answer : The temperature of the hot reservoir (in Kelvins) is 1128.18 K

Explanation :

Efficiency of carnot heat engine : It is the ratio of work done by the system to the system to the amount of heat transferred to the system at the higher temperature.

Formula used for efficiency of the heat engine.

\eta =1-\frac{T_c}{T_h}

where,

\eta = efficiency = 0.780

T_h = Temperature of hot reservoir = ?

T_c = Temperature of cold reservoir = -24.8^oC=273+(-24.8)=248.2K

Now put all the given values in the above expression, we get:

\eta =1-\frac{T_c}{T_h}

0.780=1-\frac{248.2K}{T_h}

T_h=1128.18K

Therefore, the temperature of the hot reservoir (in Kelvins) is 1128.18 K

8 0
3 years ago
Most of the world uses fossil fuels because they are
Tasya [4]

They are easy to use and more reliable

8 0
3 years ago
A retaining wall is 5m long (into the plane of the paper), and it is supported by an anchor rod. The soil it supports has a weig
vekshin1

Knowing that the greatest horizontal pressure is the pressure made by the material on the wall -considering for that the total height of the wall-, then P = 4.375 t/m

---------------------

<u />

<u>Available data</u>:

  • The wall is 5m long into the plane   ⇒  H
  • The soil density is 1.4 metric tonnes per cubic metre  ⇒ γ
  • K = 0.25  ⇒  Coefficient of earth pressure. Depends on the angle.

From this information, we need to calculate the greatest horizontal pressure.

Horizontal pressure refers to the force made by the supported soil on the retaining wall that tends to deflect the wall outward.

We can calculate horizontal pressure at different heights from the top. And since we need to calculate the greatest horizontal pressure, we need to consider the total height that equals the wall height, H.  

To do it, we will use the following formula, and replace the terms.

P  = [ k   γ H² ] / 2

P = [ 0.25 x 1.4 t/m³ x 5m² ] / 2

P = 8.75/2

P = 4.375 t/m          

------------------------------------------

Related link: brainly.com/question/19381739?referrer=searchResults

                     brainly.com/question/12359444?referrer=searchResults

7 0
3 years ago
Need today please
podryga [215]

Answer:

yeah righto the correct answer mate would be D) :)

5 0
3 years ago
Other questions:
  • Which of these uses the principle of superposition of rocks to compare the age of fossils?
    11·2 answers
  • What is the total number of neutrons in an atom of an element that has a mass number of 19 and an atomic number of 9?
    11·1 answer
  • A 190 g rock at 20°C is completely immersed in 600 g of water at 80°C. Which one of the following statements is true right after
    9·1 answer
  • The force on a current-carrying wire is a maximum when the current is moving parallel to a magnetic field. true or false
    11·1 answer
  • The average flight speed of a bald eagle is about 50 Km/h. A scientist has measured and equal flying 80 Km/h. How is this possib
    11·1 answer
  • A closed box is filled with dry ice at a temperature of -94.7°C, while the outside temperature is 26.8°C. The box is cubical, me
    9·1 answer
  • How does the uneven heating of Earth<br> create global winds?
    15·1 answer
  • Waldo needs to know how much force to apply in order to move a 4000-kg object at 2 m/S2. Which law should he refer to
    12·1 answer
  • You drive 3 hours at 50 mph and then 11 hours at 70 mph. What is your average velocity in miles per hour?
    10·1 answer
  • If a hot air balloon is seen rising above the top of a hill, what is the top of the hill called? Question 2 options: delta point
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!