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Alex
3 years ago
11

If a rigid body rotates about point O, the sum of the moments of the external forces acting on the body about point O equals whi

ch of the following?
A) IG a

B) IO a

C) m aG

D) m aO
Physics
1 answer:
Drupady [299]3 years ago
6 0

Answer:

The answer to the question is A.

Explanation:

The definition of moment is Force multiplied the distance to the point of interest.

 So the external moment at point O is equal to ⇒ EMо= F×d

 Knowing the definition of moment of inercia (I) and a newtonian Force ( m.a)

We can say that te moment of the externals force at point O is EMо= IGa

Because the rotation of a body in a inmovil point is implicated by the moment of inercia an the action of the gravity in that moment.

 

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A concave mirror is an example of curved mirrors. So that the appropriate answer to the given question is option D. The rays will cross at the focal point.

A concave mirror is a type of mirror in which its inner part is the reflecting surface, while its outer part is the back of the mirror.  This mirror reflects all parallel rays close to the principal axis to a point of convergence. It can also be referred to as the converging mirror.

In this type of mirror, all rays of light parallel to the principal axis of the mirror after reflection will cross at the focal point.

Therefore, the required answer to the given question is option D. i.e The rays will cross at the focal point.

For reference: brainly.com/question/20380620

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3 years ago
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Answer:

  the speed of the center of mass stays the same

Explanation:

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3 years ago
What type of tide occurs on a full moon or a new moon?
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Answer:

1.876 J

Explanation:

First, let’s calculate the compression of the spring from the Hooke’s law:

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here, F=75 N is the force acted on the spring, k=1500 N⁄m is the force constant of the spring, x is the compression of the spring.

Then, we get:

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correct my answer if it's wrong ^^

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3 years ago
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