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3 years ago

Why is soft iron used for the core of an electromagnet?

Physics

2 answers:

aliina [53]3 years ago

5 0

Answer:

Because of the high permeability and high saturation level of holding magnetism.

Explanation:

Soft iron always used in the core of an electromagnet because of the following reason which are discussed below.

Permeability: These magnets are highly permeable means they can gain magnetism when current is passes through them and instantly loose magnetism after removal of current.
High saturation level: The property of these soft magnets are they have the high value of saturation means they can hold high level of magnetism without easily saturating.

Tanzania [10]3 years ago

3 0

The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magne

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A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 26.0m tall building. The rock do

Pachacha [2.7K]

Answer:

A) v = 28.3 m/s

B) t = 4.64 s

Explanation:

Assuming no other forces acting on the rock, since the accelerarion due to gravity close to the surface to the Earth can be taken as constant, we can use one of the kinematic equations in order to get first the maximum height (over the roof level) that the ball reaches:

$v_{f}^{2} - v_{o}^{2} = 2* g* \Delta h (1)$

Taking into account that at this point, the speed of the rock is just zero, this means vf=0 in (1), so replacing by the givens and solving for Δh, we get:

$\Delta h = \frac{-v_{o} ^{2}}{2*g} = \frac{-(17.0m/s)^{2} }{2*(-9.8m/s2)} = 14.8 m (2)$

So, we can use now the same equation, taking into account that the initial speed is zero (when it starts falling from the maximum height) and that the total vertical displacement is the distance between the roof level and the ground (26.0 m) plus the maximum height that we have just found in (2) , 14.8m:
Δh = 26.0 m + 14. 8 m = 40.8 m (3)
Replacing now in (1), we can solve for vf, as follows:

$v_{f} =\sqrt{2*g*\Delta h} = \sqrt{2*9.8m/s2*40.8m} = 28.3 m/s (4)$

In order to find the total elapsed from when the rock is thrown until it hits the street, we can divide this time in two parts:
1) Time elapsed from the the rock is thrown, until it reaches to its maximum height, when vf =0
2) Time elapsed from this point until it hits the street, with vo=0.
For the first part, we can simply use the definition of acceleration (g in this case), making vf =0, as follows:

$v_{f} = v_{o} + a*\Delta t = v_{o} - g*\Delta t = 0 (5)$

Replacing by the givens in (5) and solving for Δt, we get:

$\Delta t = \frac{v_{o}}{g} = \frac{17.0m/s}{9.8m/s2} = 1.74 s (6)$

For the second part, since we know the total vertical displacement from (3), and that vo = 0 since it starts to fall, we can use the kinematic equation for displacement, as follows:

$\Delta h = \frac{1}{2} * g * t^{2} (7)$

Replacing by the givens and solving for t in (7), we get:

$t_{fall} =\sqrt{\frac{2*\Delta h}{g}} = \sqrt{\frac{2*40.8m}{9.8m/s2} } = 2.9 s (8)$

So, total time is just the sum of (6) and (8):
t = 2.9 s + 1.74 s = 4.64 s

5 0

2 years ago

• How does wind shape Earth’s surface?

ehidna [41]

Lamina and turbulent flow

Explanation:

mentioning about lamina and turbulent flow we could say that both form in different period of time

6 0

3 years ago

Light absorbed by a chlorophyll a causes A) an electron to move from the photon to the chlorophyll. B) an electron to move from

fiasKO [112]

Answer:

B) an electron to move from ground state to an excited state.

Explanation:

Chlorophyll is a pigment that absorbs electromagnetic radiation of the visible spectrum that is used in process of photosynthesis. Chlorophyll's function is to absorb electromagnetic radiation of the visible spectrum and it absorbs blue color radiation the best and green the worst as it reflects it. It absorbs electromagnetic radiation by absorbing the energy of the photon of light by a process called charge separation.

Charge separation is the process by which an electron gets to a higher energy state by absorbing the energy of a photon.

6 0

3 years ago

for a certain chemical reaction, the reactants contain 52 kj of potential energy and the products contain 32 kj how much energy

Luden [163]

B, is the answer. (20 kj is released)

7 0

2 years ago

Read 2 more answers

15.One girl was involved in a bus crash. She told the police that she was seated in the last line of seats and that when the bus

Alona [7]

Answer: It is not likely.

Explanation:

When the bus is moving forward, all the objects inside of it also are moving forward.

Now, as the objects inside the buss are not fixed to the bus, if the bus suddenly stops the objects inside of it will keep moving forward, because of the conservation of the momentum, defined as the quantity of motion (Similar to when you are in a car and it suddenly stops, you can feel the forward impulse).

Then is not likely that, in a case where the bus stops suddenly, an object inside the bus flies backward in opposite direction to the previous movement of the bus.

5 0

2 years ago