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3 years ago

Investing in yourself and your career often requires you to “play it safe”.

Physics

1 answer:

SashulF [63]3 years ago

8 0

i'd say false, is this for health or lifeskills?

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In the 19th century James Joule, an English scientist, was the first to recognize the mechanical equivalent of heat as a specifi

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Answer:

D) wood rubbed against a rough surface feels hot

Explanation:

The heat is transferred from one form of energy (friction of the wood being rubbed against the surface) to another (heat energy).

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3 years ago

Read 2 more answers

Unpolarized light with intensity I0I0I_0 is incident on an ideal polarizing filter. The emerging light strikes a second ideal po

zvonat [6]

Answer:

$0.293I_0$

Explanation:

When the unpolarized light passes through the first polarizer, only the component of the light parallel to the axis of the polarizer passes through.

Therefore, after the first polarizer, the intensity of light passing through it is halved, so the intensity after the first polarizer is:

$I_1=\frac{I_0}{2}$

Then, the light passes through the second polarizer. In this case, the intensity of the light passing through the 2nd polarizer is given by Malus' law:

$I_2=I_1 cos^2 \theta$

where

$\theta$ is the angle between the axes of the two polarizer

Here we have

$\theta=40^{\circ}$

So the intensity after the 2nd polarizer is

$I_2=I_1 (cos 40^{\circ})^2=0.587I_1$

And substituting the expression for I1, we find:

$I_2=0.587 (\frac{I_0}{2})=0.293I_0$

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2 years ago

Acceleration is measured in_________ m g m/s m/s2

Nana76 [90]

Acceleration is measured in m/s².

Answer: m/s²

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3 years ago

Can someone explain the normal force? where does it come from? ...?

Vilka [71]

The normal force is the support force exerted upon an object which is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. The normal force in itseñf comes from the third law of Newton as a reactive force

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3 years ago

Pushing a heavy sofa across a carpeted room is an example of

Diano4ka-milaya [45]

Force is the answer so

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3 years ago