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anastassius [24]
3 years ago
9

Which best compares a brush and a commutator in an electric motor?

Physics
2 answers:
qaws [65]3 years ago
4 0

Answer: Both carry electrical current from a power source.

hope this helps (:

alisha [4.7K]3 years ago
3 0
The purpose of the brush is supposed to be to lessen the amount of damage or wear placed upon the motor. I hope this helps with your answer choices since you did not post any.
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Convert the following in to SI units without changing its values<br> a. 4000 g <br>b. 2.4 km​
lana66690 [7]

hi <3

i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.

hope this helps :)

3 0
3 years ago
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dem82 [27]

Answer:

Explanation:

Frequency*speed

= 0.5*2.5

= 1.25m

3 0
2 years ago
Vector question,university physics zemanski
just olya [345]

Answer:

yes This is correct Answer

3 0
2 years ago
When a pendulum is at the midpoint of its oscillation, hanging straight down, which statement is true?
Svetach [21]
When a pendulum is at the midpoint of its oscillation, hanging straight down ...

-- that's the fastest it's going to swing, so its kinetic energy is maximum;
and
-- that's the lowest it's going to get, so its potential energy is minimum.

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5 0
3 years ago
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While sitting in a swivel chair, you push against the floor with your heel to make the chair spin. The 6.7 N frictional force is
nexus9112 [7]

Answer:

I = 1.4kgm²

Explanation:

The rotational motion is caused by the frictional force, which generates a torque on the system. As there is no other force that creates a torque, this can be expressed in the equation of rotational motion below:

\tau_f =I\alpha\\\\

And \tau_f=rf, where r is the distance from the point of application and the rotation axis, and f is the magnitude of the frictional force. This is because the frictional force is applied in the direction that causes the greatest angular acceleration (this is, 90°) and rf\sin90\°=rf. Then, we have that:

rf=I\alpha\\\\\implies I=\frac{rf}{\alpha}\\\\

Plugging in the given values, we obtain:

I=\frac{(0.39m)(6.7N)}{1.8rad/s^{2} } =1.4kgm^{2}

In words, the total moment of inertia is equal to 1.4kgm².

6 0
2 years ago
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