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3 years ago

80 km por hora em metros por segundo

Physics

1 answer:

Schach [20]3 years ago

4 0

80km/h * 1000m/1km * 1h/3600s = 200/9 m/s= 22.222.....m/s

ans : 22m/s

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2 years ago

2. A 20 cm object is placed 10cm in front of a convex lens of focal length 5cm. Calculate

adoni [48]

Answer:

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${ \tt{ \frac{1}{v} + \frac{1}{u} = \frac{1}{f} }} \\$

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${ \tt{ \frac{1}{v} + \frac{1}{10} = \frac{1}{5} }} \\ \\ { \tt{ \frac{1}{v} = \frac{1}{10} }} \\ \\ { \tt{v = 10}} \\ \\ { \underline{ \underline{ \pmb{ \red{ \: image \: distance \: is \: 10 \: cm \: \: }}}}}$

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• Let's derive this formula from the lens formula:

${ \tt{ \frac{1}{v} + \frac{1}{u} = \frac{1}{f} }} \\$

» Multiply throughout by fv

${ \tt{fv( \frac{1}{v} + \frac{1}{u} ) = fv( \frac{1}{f} )}} \\ \\ { \tt{ \frac{fv}{v} + \frac{fv}{u} = \frac{fv}{f} }} \\ \\ { \tt{f + f( \frac{v}{u} ) = v}}$

• But we know that, v/u is M

${ \tt{f + fM = v}} \\ { \tt{f(1 +M) = v }} \\ { \tt{1 +M = \frac{v}{f} }} \\ \\ { \boxed{ \mathfrak{formular : } \: { \tt{ M = \frac{v}{f} - 1 }}}}$

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${ \tt{M = \frac{10}{5} - 1 }} \\ \\ { \tt{M = 5 - 1}} \\ \\ { \underline{ \underline{ \pmb{ \red{ \: magnification \: is \: 4}}}}}$

 » Nature of Image :

Image is magnified
Image is erect or upright
Image is inverted
Image distance is identical to object distance.

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2 years ago

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Answer:

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Explanation:

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3 years ago

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Naddika [18.5K]

Answer:

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You can view in the attached diagram to understand how the velocity is being changed.

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3 years ago

What happens when the object is placed at F? Explain your answer.

sp2606 [1]

Sample Response: No image will be formed because the rays will not converge to or diverge from a common point.

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3 years ago

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