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dalvyx [7]
2 years ago
9

A bucket of warm water can be considered a closed system for a very short period of time. Which best explains this phenomenon? A

. The bucket of warm water will eventually turn cold and begin to evaporate. B. The bucket of warm water can be easily spilled. C. The bucket of warm water can contain different elements. D. The mass of the bucket of water will eventually disappear.
Physics
1 answer:
zlopas [31]2 years ago
3 0
The reason is that a closed system has nothing going in or out and water retains energy very well also water it polar so it is attracted to itself. It doesnt like contact with other things.
So it's likely to be C
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Ball is dropped from the height H the total distance covered in last second of its motion is equal to distance covered in first
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\rm{\gray{\underline{\underline{\blue{GIVEN:-}}}}}

  • A ball is dropped from a height = H

  • The total distance covered in last second of its motion is equal to the distance covered in first 3 second .

\rm{\gray{\underline{\underline{\blue{TO\:FIND:-}}}}}

  • The height of the journey .

\rm{\gray{\underline{\underline{\blue{SOLUTION:-}}}}}

We have know that,

\green\bigstar\:\rm{\gray{\overbrace{\underbrace{\red{S\:=\:ut\:+\:\dfrac{1}{2}\:at^2\:}}}}}

Where,

  • S = Distance .

  • u = initial velocity = 0m/s

  • t = time = 3s

  • a = acceleration

[Note :- Here, acceleration is ‛acceleration due to gravity’ .]

  • a = 10m/s^2

=> S = 1/2 × 10 × (3)^2

=> S = 5 × 9

=> S = <u>4</u><u>5</u><u>m</u> -----(1)

✒ If the ball takes ‛n’ second to fall the ground, then distance covered in nth second is,

\green\bigstar\:\rm{\gray{\overbrace{\underbrace{\red{S_n\:=\:u\:+\:\dfrac{g}{2}\:(2n\:-\:1)\:}}}}}

=> Sn = 0 + 10/2 (2 × n - 1)

=> Sn = 5 (2n - 1)

=> Sn = 10n - 5 -----(2)

Therefore,

  • 10n - 5 = 45

=> 10n = 45 + 5

=> n = 50/10

=> n = <u>5</u>

Now put the value of ‛n = 5’ in equation(2), we get

=> Sn = 10 × 5 - 5

=> Sn = 50 - 5

=> <u>Sn</u><u> </u><u>=</u><u> </u><u>4</u><u>5</u><u>m</u>

\rm{\pink{\therefore}} The height of the journey is “ <u>4</u><u>5</u><u>m</u> ” .

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emmainna [20.7K]

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Flauer [41]

Answer:

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frez [133]

Any force of 29.4 Newtons or greater can do it.

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** URGENT** The voltage across the primary winding is 350,000 V, and the voltage across the secondary winding is 17,500 V. If th
Vlad [161]

As we know that in transformers we have

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