What is the function of brushes

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Answer 1

Answer:

Answer:

A brush is a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft.

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Newton's Second Law of Motion is expressed as F = ma. A lawn mower is pushed over a length of grass. If the pushing force suddenly doubles what will happen to the lawn mower's rate of acceleration? The mass of the lawn mower is constant. A.The acceleration will double. B.The acceleration will decrease by half. C.The acceleration will remain constant. D.The acceleration will triple.

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From the given equation F = ma, which is Newton's Second Law of Motion (Law of Acceleration), it shows that force F is directly proportional to acceleration a. If it said that the pushing force F suddenly doubles, and the mass of the mower stays the same, then the only variable in the equation is the acceleration. Since they are directly proportional, we can conclude that the acceleration has also doubled. Among the choices, the correct answer is A.

Answer:

A) The acceleration will double

Explanation:

Given the expression according to Newton's second law F = ma where;

F is the force

m is the mass of the object

a is the acceleration

Let the initial force be F1 and acceleration be a1

F1 = ma1...(1)

If the pushing force suddenly doubles if the lawn mover is pushed over a length of grass, the new force F2 = 2F1 and acceleration of force F2 will be a2, since the mass doesn't change;

F2 = ma2

2F1 = ma2...(2)

Dividing equation 2 by 1, we will have;

2F1/F1 = ma2/ma1

2 = a2/a1

a2 = 2a1

This shows that the acceleration doubles if the pushing force doubles since force is directly proportional to the acceleration. Increase in the applied force will lead to equal increase in the acceleration and vice versa

A 9.0 volt battery is connected to four resistors in a parallel circuit. The resistors have 7.0 Ω, 5.0 Ω, 4.0 Ω, and 2.0 Ω respectively. What is the total current in the circuit?

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series,effective resistance =R₁+R₂+R₃...
parallel,effective resistance 1/R=1/R₁ +1/R₂ +1/R₃...

Here,effective resistance 1/R =1/7 +1/5+ 1/4+1/2
=1.092
R = 1/1.092 =0.915Ω
voltage V=9 V
current I=V/R
I=9 / 0.915
=9.83 A

parallel resistance = $(1)/(7)$ + $(1)/(5)$ + $(1)/(4)$ + $(1)/(2)$
= $(140)/(153)$

now , V= 9V
V = IR
I = $(V)/(R)$
I = $(9)/(140)$ x 153
I = 9.835714 A

To neutralize gastric juices in your stomach antacids contain

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To neutralize gastric juices in your stomach antacids contain basic chemicals. The acid in your stomach has a lower pH value. To neutralize this and reach a pH of 7, the antacid must contain a base.

What is a lunar eclipse?

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Moon eclipse is when the moon interposes between the sun and behind the Earth. The moon passes behind the Earth into its umbra and not viceversa! This is possible when the three of them are ALIGNED (in syzygy). In Romania, there was such eclipse that could be seen at an October night last year.

A lunar eclipse is basically when the earth passes between the moon and sun, causing the moon to appear darkened. Also, unlike the solar eclipse, the lunar eclipse occurs during the day.

A speedboat initially at rest accelerates uniformly at 4.0 m/s (squared) for 7.0 s. How fast is the boat moving after 7.0 s?

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well if the boat initially at rest accelerates at uniformly at 4.0 m/s (squared) then it would be best to muitlply it so 4.0 squared equals 2 by multiplying that by 7.0 your answer would be 14 s

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