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Tasya [4]
3 years ago
7

PLEASE I NEED HELP

Physics
1 answer:
777dan777 [17]3 years ago
5 0

Answer:

K= 95.4 J

Explanation:

For this exercise we must use the conservation of mechanical energy.

We set a reference system on the floor.

Starting point. Higher

          Em₀ = U = m g h

Final point. Just before taking the floor

           Em_f = K = ½ m v²

energy is conserved because there is no friction

         Em₀ = Em_f

         mg h = K

         

The height is

  1.         h = y -y₀

                 h = 0- y₀

let's calculate

       K =  3.23 (-9.81)  (-3.01)          

       K= 95.4 J

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A vector A⃗ has a length of 8.6 m and points in the negative x direction. Find the x component of the vector −3.7A⃗ .
77julia77 [94]

Answer:

31.8 m in the positive x-direction

Explanation:

Here we have an example of multiplication of a vector by a scalar.

In order to perform this operation, we have to:

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In this problem, the original vector has a lenght of 8.6 m and it points in the negative x direction. Now we have to find the vector -3.7A, so we have:

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3 years ago
A convex lens of focal length 25 cm is in contact with a concave lens of focal length 50 cm. The equivalent focal length of this
Gwar [14]

The equivalent focal length of this combination-lenses should be +50 cm.

Given:

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We know that the power of a lens is given as:

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Similarly, the power of concave lens can be calculated as:

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Therefore, the equivalent focal length of this combination-lenses will be +50 cm.

Learn more about mirrors and lenses here:

<u>brainly.com/question/3209252</u>

#SPJ4

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