3 years ago

A rock with a mass of 10.0kg falls 25.0m to

Physics

1 answer:

Jlenok [28]3 years ago

8 0

Answer:

man brainly should put a rank for having negative points

Explanation:

that would be me right now

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Whats is a non exaple of speed?

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acceleration

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Acceleration is the measurement of mass and volume and any measurement but not speed.

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A tree frog leaping upward off the tree branch is pulled downward by

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Yeah I think you're right

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Because every obj is in motion till acted upon by a force(the branch)

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james throws a baseball with a horizontal component velocity of 30 m/s east and a vertical component velocity of 40m/s North.How

olga2289 [7]

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3 years ago

*PLEASE HELP*

kotegsom [21]

Answer: The focal length of the lens = 3.32 cm.

Explanation:

Lens formula : $\dfrac1f=\dfrac1v-\dfrac1u$ (i)

f= focal length , v=image distance , u =object distance.

magnification: m = $\dfrac{v}{u}$ (ii )

Given: v= -12.8 cm , m =2.85

Put values in (ii), we get

$2.85=\dfrac{-12.8}{u}\\\\\Rightarrow\ u=\dfrac{-12.8}{2.85}\\\\\Rightarrow\ u=-4.49\ cm$

substitute values of u , v in (i)

$\dfrac1f=\dfrac1{-12.8}-\dfrac{1}{4.49}\\\\\Rightarrow\dfrac1f=-0.30084214922\\\\\Rightarrow\ f=\dfrac{-1}{-0.30084214922}\approx3.32\ cm$

Hence, the focal length of the lens = 3.32 cm.

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3 years ago

Read 2 more answers

An electric bulb marked 40W-200V is used in a circuit of supply voltage 100V. Now its power is:

svp [43]

Answer:

Power of the bulb is 10 Watts.

Explanation:

We have,

Power and voltage of electric bulb is 40 W and 200 V. Using this data we can find the resistance of the bulb.

Power, $P=\dfrac{V^2}{R}$

R is resistance

$R=\dfrac{V^2}{P}\\\\R=\dfrac{(200)^2}{40}\\\\R=1000\ \Omega$

The supplied voltage is 100 V.

Now power is given by :

$P=\dfrac{V^2}{R}\\\\P=\dfrac{100^2}{1000}\\\\P=10\ W$

So, now the power of the bulb is 10 Watts.

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3 years ago