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3 years ago

7

How many stars are in our galaxy??

2 answers:

Firdavs [7]3 years ago

8 0

Answer:

Explanation:

There are 400 billion stars in our galaxy

Vesnalui [34]3 years ago

3 0

Answer:

Hi! I believe this is your answer:

400 billion

Hope this helps, sorry if it's wrong!!

Explanation:

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HOW DO U FEEL WHEN U PLAY OR WATCH BADMINTON?

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Answer:

I feel exited and happy I enjoy it with my friend

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3 years ago

By how many times will the kinetic energy of a body increase if its speed is tripled? Show by calculation .

alina1380 [7]

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9 lần

Explanation:

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3 years ago

Which changes in an electric motor will make the motor stronger? select 3 options. using a stronger permanent magnet using a wea

Masja [62]

1. Using Strong Permanent. 2. increasing the current. 3. Decreasing the space between Magnets

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3 years ago

An object is placed in front of a diverging lens, such that the object-to-image distance is 71 cm.

Pachacha [2.7K]

Explanation:

Given that,

Object-to-image distance d= 71 cm

Image distance = 26 cm

We need to calculate the object distance

$u -v= d$

$u=71+26=97\ cm$

We need to calculate the focal length

Using formula of lens

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

put the value into the formula

$\dfrac{1}{f}=\dfrac{1}{-26}+\dfrac{1}{97}$

$\dfrac{1}{f}=-\dfrac{71}{2522}$

$f=-35.52\ cm$

The focal length of the lens is 35.52.

(B). Given that,

Object distance = 95 cm

Focal length = 29 cm

We need to calculate the distance of the image

Using formula of lens

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

Put the value in to the formula

$\dfrac{1}{-29}=\dfrac{1}{v}-\dfrac{1}{95}$

$\dfrac{1}{v}=\dfrac{1}{-29}-\dfrac{1}{95}$

$\dfrac{1}{v}=-\dfrac{124}{2755}$

$v=-22.21\ cm$

We need to calculate the magnification

Using formula of magnification

$m=\dfrac{v}{u}$

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$m=0.233$

The magnification is 0.233.

The image is virtual.

Hence, This is the required solution.

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3 years ago

A photograph of you and your friends at your 8th birthday party.is it secondary or primary source and why?

Reptile [31]

Answer:

primary source

Explanation:

the explanation is in the image above

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3 years ago