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3 years ago

A 10 kg weight is suspended in the air by a strong cable. How much work is done, per unit time, in suspending the weight

Physics

1 answer:

tankabanditka [31]3 years ago

3 0

Answer:

There is no work done.

Explanation:

Given the following data;

Mass = 10 kg

To find the work done?

In Physics, work done can be defined as the amount of energy transfered when an object or body is moved over a distance due to the action of an external force.

Mathematically, work done is given by the formula;

Work done = force * distance

$W = F * d$

Where,

W is the work done

F represents the force acting on a body.

d represents the distance covered by the body.

However, the weight suspended in the air by a strong cable does not move or experience any form of displacement. Therefore, there is no work done.

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Answer: critical angle, sin^-1 (n2/n1)

Explanation: the angle of incidence at which the retracted ray makes an angle of 90° with the normal is known as the critical angle.

Snell's law defined refraction mathematically as shown below

n1 sin θi = n2 sin θr

n1 = refractive index of the first medium

n2 = refractive index of the second medium

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θr = angle of refraction

When the refrafted ray is perpendicular to the normal, the angle of refraction (θr) is 90° hence making the angle of incidence (θi) the critical angle θc

By substituting these conditions into the Snell's law, we have that

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According to trigonometry, the value of sin 90 is 1, hence we have that

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3 years ago

Is it possible for the momentum of a system consisting of two carts on a low-friction track to be zero even if both carts are mo

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Answer:

Yes, if the two carts are moving into opposite directions

Explanation:

The total momentum of the system of two carts is given by:

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We want to know if it is possible that the total momentum of the system can be zero, so it must be:

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From this equation, we see that this condition can only occur if v1 and v2 have opposite signs. Opposite signs mean opposite directions: therefore, the total momentum can be zero if the two carts are moving into opposite directions.

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