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Deffense [45]
3 years ago
7

Which of the following is proportional to the net external force acting on a body?

Physics
1 answer:
swat323 years ago
5 0
Well, Velocity is the speed of something in a given direction, and speed is the rate at which someone or something is able to more or operate. They both invlove speed, so this is a hard one, but I wold say either B or D
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Please help need to know ASAP.
LUCKY_DIMON [66]

Answer: because she is pedalling at her maximum speed produced by the maximum force applied. At constant speed, acceleration is equal to zero.

Explanation:

Pedalling of bicycle involves application of force. The force applied produces circular motion to the tires which eventually transform into linear speed.

V = wr

Where V = linear speed

W = angular speed

r = radius.

Change in speed V will lead to acceleration or deceleration depending on increase or decrease in speed.

If she stops accelerating, then, she must have applied force that makes her pedalling at maximum speed. She is also maintaining this uniform (constant ) speed. After reaching her maximum speed.

At constant speed, acceleration = 0

Base on this explanation, even though she is still pedalling as fast as she can, which at constant speed, she will stop accelerating and her speed reaches a maximum value because she is pedalling at her applied maximum force.

8 0
3 years ago
Read 2 more answers
I NEED HELP PLEASE, THANKS! Light passes from air into water at an angle of 40.0° to the normal. What is the angle of refraction
Vlad [161]

Answer:

Angle of Refraction = 28.9 degrees

Explanation:

<u><em>We'll use Snell's law for this. It's mathematical form is:</em></u>

=> n_1* sin(\alpha _1)=n_2 * sin(\alpha _2)

Where n_{1} = 1, n_{2} = 1.33, \alpha _{2} = 40^o

=> n_{1} and n_{2} are the refractive indexes of the air and water respectively.

<u><em>Solution:</em></u>

=> 1 * sin (40) = 1.33 * sin(\alpha _{2})

=> sin \alpha _{2} = \frac{sin 40^0}{1.33}

=> sin \alpha _{2} = 0.4821

=> \alpha _{2} = 28.9 degrees

8 0
3 years ago
The time constant of an RC circuit is 2.7 s. How much time t is required for the capacitor (uncharged initially) to gain 0.63 of
gayaneshka [121]

Answer:

2.7s

Explanation:

The solution of time required is shown below:-

In the RC circuit condenser charge 63 percent of the full charge from initial time to constant time

Now, the

63% that is equal to 0.63 which is full equilibrium charge

Therefore, the time required to maintain will be Equal to time (t) constant that is 2.7s

So, the correct answer is 2.7s

8 0
3 years ago
A roller coaster track is 3000 meters long. It takes 100 seconds to travel once around the roller coaster. What is the average s
Svetllana [295]
All you have to do is divide 3000 by 100, Its 30
6 0
3 years ago
Read 2 more answers
The process by which hot and cold air are transferred in the atmosphere is
elena-14-01-66 [18.8K]
Hey there!

<span>The process by which hot and cold air are transferred in the atmosphere is convection.</span>
8 0
3 years ago
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