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anastassius [24]

3 years ago

9

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

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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As you stand on a floor, the floor exerts an upward force on you. why are you not moved upward by this force? 1. the upward forc

dolphi86 [110]

Newton's third law of motion states that for any action, there is equal and opposite force. For a person standing on a floor, the action force is the weight and thus the floor must exert an opposite and equal reaction force equivalent in magnitude to the weight of the person.

In this regard, statement 3. is correct.

6 0

3 years ago

4. A 75 kg bobsled is pushed along a horizontal surface by two athletes. After the

vlada-n [284]

The net force on the sled is 300 N

Explanation:

First of all, we start by finding the acceleration of the bobsled, by using the suvat equation:

$v^2-u^2=2as$

where:

v = 6.0 m/s is the final velocity of the sled

u = 0 is the initial velocity

a is the acceleration

s = 4.5 m is the displacement of the sled

Solving for a, we find

$a=\frac{v^2-u^2}{2s}=\frac{6.0^2-0}{2(4.5)}=4 m/s^2$

Now we can find the net force on the sled by using Newton's second law:

F = ma

where

F is the net force

m = 75 kg is the mass of the sled

$a=4 m/s^2$ is the acceleration

Solving the equation, we find the net force:

$F=(75)(4)=300 N$

Learn more about acceleration and Newton laws here:

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8 0

3 years ago

The gondola ski lift at a Colorado ski resort is 2671 m long. On average, the ski lift rises 14.2° above the horizontal. How hig

Doss [256]

Answer:

$y=677.29m$

Explanation:

Given data

Distance r=2671 m

Angle α=14.2°

To find

High is the top of the ski lift relative to the base

Solution

As we know that

$y=rSin\alpha$

Substitute the given values

$y=2671Sin(14.2^{o} )\\y=677.29m$

So the ski lift is 677.29m high

5 0

3 years ago

PLEASE HELP!!!!!!!! In a circuit, voltage and current are (a) directly proportional, (b) inversely proportional, (c) not proport

Ivahew [28]

Answer:

Directly proportional

Explanation:

Ohm's law states that the electric current is directly proportional to the voltage between two points. Its mathematical form is given by :

$V=I\times R$

R is resistance

In a circuit, voltage and current are directly proportional to each other. So, the correct option is (a) "directly proportional".

8 0

3 years ago

How is power related to distance and time?

Monica [59]

There is no direct relationship between power
and either of those quantities.

4 0

3 years ago