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balu736 [363]
3 years ago
6

How important friction is?

Physics
1 answer:
kirill [66]3 years ago
3 0

Friction is important because;

  • It enables us to walk due to the grip our feet have on the ground.
  • It enables the planes to fly due to the drag force.
  • It enables vehicles to move and to stop due to brakes and tire marks
  • Friction enables us to write using a pen.
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An object is located 50 cm from a converging lens having a focal length of 15 cm. Which of the following is true regarding the i
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Answer:

It is real, inverted, and smaller than the object.

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Let's start by using the lens equation to find the location of the image:

\frac{1}{q}=\frac{1}{f}-\frac{1}{p}

where we have:

q = ? is the distance of the image from the lens

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Solving the equation for q, we find

\frac{1}{q}=\frac{1}{15 cm}-\frac{1}{50 cm}=0.047 cm^{-1}

q=\frac{1}{0.047 cm^{-1}}=+21.3 cm

The sign of q is positive, so the image is real.

Now let's also write the magnification equation:

h_i = - h_o \frac{q}{p}

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h_i, h_o are the size of the image and of the object

By substituting p = 50 cm and q = 21.3 cm, we find

h_i = - h_o \frac{21.3 cm}{50 cm}=-0.43 h_o

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h_i < 0 : this means that the image is inverted

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