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patriot [66]
3 years ago
10

Why does alternating current change direction 50 to 60 times per second?

Physics
2 answers:
Artist 52 [7]3 years ago
8 0

Answer:

Explanation:

i'm not sure but i think it might be b.

pishuonlain [190]3 years ago
6 0

Answer:

A) because it is produced by a generator that changes current direction as it spins

Explanation:

Alternating current has a frequency of around 60 Hz because it is produced by a generator that changes direction as it spins. Every time the arm passes through the magnetic field in the generator, the current changes direction.

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Anyone good with scientific notations? I sure am not
defon
B is the answer that I know of.
7 0
3 years ago
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Electromagnetic waves have the ability to travel through empty space because they do not require a medium to travel through.
matrenka [14]

True. Electromagnetic energy does not require a medium.

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3 years ago
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Desperado, a roller coaster built in Nevada, has a mass of 800 kg. It also has a vertical drop of 225 feet down the first hill.
weeeeeb [17]

Answer:

the work done by friction on the car is 524,582 J.

Explanation:

Given;

mass of the roller coaster, m = 800 kg

distance moved by the coaster, d = 225 ft = 68.58 m

final velocity of the coaster, v = 80 mi/h = 35.76 m/s

The time taken for the coaster to drop down the hill is calculated as;

t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\ \times \ 68.58}{9.8} } \\\\t = 3.74 \ s

The work done by friction on the car is calculated as;

W =F\ \times \ d = \frac{mv}{t} \times \ d\\\\W = \frac{800 \ \times \ 35.76  }{3.74} \times \ 68.58\\\\W = 524,582 \ J

Therefore, the work done by friction on the car is 524,582 J.

6 0
3 years ago
Convert 70 mi/h to m/s. 1 mi = 1609 m.<br><br> Answer in units of m/s.<br><br> Plz help me now
melisa1 [442]

Answer:

70mi/h

1mile =1609 meters

1hour=3600 seconds

So,

70×1609/3600

112,630/3600

31.286 m/s

Hope this helps you

6 0
3 years ago
How much work is required to lift a 2 kilogram mass to a height of 10 meters
Semmy [17]

Given mass = 2kg, height = 10m,g = 9.8.


We know that Work done W = FD


= > W = (mg)(D)


= > W = (2 * 9.8)(10)


= > W = 196 Joules.


Hope this helps!

4 0
3 years ago
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