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3 years ago

Why does the magnet rotate in an AC motor?

Physics

1 answer:

boyakko [2]3 years ago

8 0

Forces of gravity and magnets.

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Please help me with this question...

vredina [299]

The answer is B (The second one). I'm not sure though.

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3 years ago

The sun's core _____. A) is made of solid helium B) makes up most of the sun's size C) creates energy by fusing hydrogen into he

VashaNatasha [74]

I think the correct answer is C

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3 years ago

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A 30.0 kg packing case is initially at rest on the floor of a 1500 kg pickup truck. The coefficient of static friction between t

alexgriva [62]

Answer:

(a). The magnitude of the frictional force acting on the case is 66 N northward.

(b). The magnitude of the friction force acting on the case is 58.8 N southward.

Explanation:

Given that,

Mass of packing case = 30.0 kg

Mass of truck = 1500 kg

Coefficient of static friction = 0.30

Coefficient of kinetic friction = 0.20

Acceleration = 2.20 m/s² northward

(A). We need to calculate the force acting on the case

Using formula of force

$F=ma$

Put the value into the formula

$F=30.0\times2.20$

$F=66\ N$

We need to calculate the maximum static frictional force

Using formula of frictional force

$f_{\mu}=\mu mg$

Put the value into the formula

$F_{\mu}=0.30\times30.0\times9.8$

$F_{\mu}=88.2$

The frictional force is greater then the force acting on the block

Then, The frictional force is 66 N northward.

(B). We need to calculate the force acting on the case

Using formula of force

$F = ma$

Put the value into the formula

$F=30.0\times3.40$

$F=102\ N$

The static friction force is less then the force action on the case

We need to calculate the maximum static frictional force

Using formula of frictional force

$f_{\mu}=\mu mg$

$f_{\mu}=0.20\times30.0\times9.8$

$f_{\mu}=58.8\ N$

So, The magnitude of the friction force acting on the case is 58.8 N southward.

Hence, This is the required solution.

7 0

3 years ago

Help pls!!

STatiana [176]

The correct answer would be C

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3 years ago

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Which statement describes an AC generator?

gregori [183]

AC (Alternating Current) generator is a device that produces an electromotive force.This generator produces alternating current. Alternating current is electric current that changes its direction many times a second, at regular intervals. This is the type of current with which customers are supplied in the energy distribution network.

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4 years ago

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