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inessss [21]
3 years ago
15

An electric motor is connected to a battery. The current flows through brushes to a commutator ring, which is attached to an ele

ctromagnet turning through a permanent magnetic field.
What is the purpose of the commutator ring?


It turns the electromagnet in the opposite direction.
It keeps the electromagnet from losing its magnetism.
It periodically reverses the current flow through the electromagnet.
It allows mechanical energy to be converted into electrical energy.
Physics
2 answers:
Shalnov [3]3 years ago
3 0
B.................................................
Dvinal [7]3 years ago
3 0
<span>It periodically reverses the current flow through the electromagnet.


</span>
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This engineer invented the iron wire to replace hemp rope.
IceJOKER [234]
The answer is A John Roebling.
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4 years ago
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What is the effect of decreasing the use of fossil fuel on animals threatened by extinction?
Eduardwww [97]

Answer:

Decreasing the use of fossil fuels will improve the wellbeing of animals (and people, for that matter). Burning fossil fuels like coal and using oil and other limited resources has polluted the biosphere, and this has had an adverse impact on many animals. If we were to limit this, it would no doubt improve their situation and make them less likely to extinction.

7 0
3 years ago
A wave is traveling in a string at 58 m/s. when the tension is then increased 17%, what will be the resulting wave speed?
Zepler [3.9K]

the resulting wave speed=62.7 m/s

Explanation:

The speed of a wave is given by

v=\sqrt{\frac{T}{\mu} }

T= tension, v= velocity= 58 m/s

when the tension is increased by 17%, new tension= 1.17 T

V'=\sqrt{\frac{1.17T}{\mu}}

V'=1.082 \sqrt{\frac{T}{\mu}}

V'=1.082 V

V'=1.082 (58)

V'=62.7 m/s

7 0
3 years ago
Why will a delivery truck filled with birds sitting on its floor be heavier than a truck with the same birds flying around insid
34kurt

The reason why a delivery truck filled with birds sitting on the floor be heavier than a truck with the same birds flying around is because when the birds are sitting on the floor, they are adding their weight to the truck.

Meanwhile, if the birds are flying around they aren't resting on the truck or touching it, so therefore their weight wouldn't be added to the truck.

The mass of the truck will remain the same as you cannot change the mass but the weight will vary depending on the items and objects placed in it.

4 0
3 years ago
The legs of a weight lifter must ultimately support the weights he has lifted. A human tibia (shinbone) has a circular cross sec
Sergio039 [100]

Answer:

249003822308.05008 N

Explanation:

F = Force

\sigma = Breaking stress of bone = 150 MPa

d_2 = Outer diameter = 3.6 cm

d_1 = Inner diameter = 2.3 cm

Area of the bone is assumed to be a hollow cylinder

A=\dfrac{\pi}{4}(d_2^2-d_1^2)

Stress is given by

\sigma=\dfrac{F}{A}\\\Rightarrow F=\sigma A\\\Rightarrow F=\dfrac{150\times 10^6}{\dfrac{\pi}{4}(0.036^2-0.023^2)}\\\Rightarrow F=249003822308.05008\ N

The maximum weight the person can lift without breaking his legs is 249003822308.05008 N

3 0
4 years ago
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