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3 years ago

Who was albert einstien describe his contributions???

Physics

1 answer:

olga nikolaevna [1]3 years ago

6 0

Answer:

Albert Einstein was from Germany he was born theoritical physicist, from childhood only he loved mechanical toys, he was highly gifted in Mathematics, He was a world citizen and a scientific genius too. His contribution were:

1) he developed the theory of relativity

2) he also discovered the process of nuclear fission

3)he developed the quantum theory of specific heat

4)theory of stimulated emission, on which laser device technology is based

5) law of photoelectric effect

hope it helped you :)

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In which situation is no work considered to be done by a force?

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If the angle is 45, then there is still some work involved.
The only option where there is no work done by a force is B. when the angle is between the force and displacement is 90.

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3 years ago

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Maslowich

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Vaselesa [24]

Answer:

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Explanation:

t = Time the battery is on = 60 hours

I = Current = $15\times 10^{-3}\ A$

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$V=\dfrac{6+4}{2}=5\ V$

Energy is given by

$E=V\times I\times t$

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The energy delivered in the given time is 16200 J

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3 years ago

A bullet fired vertically at a velocity of 36m/s .after 45 the bullet hit the top of a bulid how height is a bulid?

zzz [600]

Answer:

The height of the building is 8,302.5 m

Explanation:

Given;

velocity of the projectile, u = 36 m/s

time of motion, t = 45 s

Let the upward direction of the bullet be negative,

The height of the building is calculated as;

$h = ut - \frac{1}{2} gt^2\\\\h = (36\times 45) - (\frac{1}{2} \times 9.8 \times 45^2)\\\\h = 1620 - 9922.5\\\\h = -8,302.5 \ m\\\\The \ height \ of \ the \ building \ is \ 8,302.5 \ m$

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3 years ago