PHYSICS MIDDLE SCHOOL

20. There are two electrical devices, one is electrical kettle of 2KW-200V andnext one is electrical heater of 1KW-240 V. Which device has highest
resistance?

Answers

Answer 1

Answer:

Electrical kettle:

P = 2 KW = 2000 W

U = 200 V

⇒ I = P/U = 2000 / 200 = 10 A

We apply the Law of Ohm:

R = U / I = 200V / 10A = 20 Ω

=======

Electrical heater:

P = 1 KW = 1000 W

U = 240 V

⇒ I = P/U = 1000 / 240 = 4,16 A

We apply the Law of Ohm:

R = U / I = 240V / 4,16A = 57,69 Ω

Answer:

The device with the highest resistance is the electric heater.

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2 3 4 it really depends on how many people are in the wagon.

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Who created E = mc2?
(What is it)?

Answers

Albert Einstein created this equation. It means that the formula $E= mc^(2)$ shows that mass can be converted into energy, and energy can be converted into mass. Einstein made this equation 100+ years ago, and yes, he was right with the theory.

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Could plant roots do photosynthesis? Give reasons for your answer.

Answers

No they could not. The cells within the plant roots haven't been exposed to sunlight, so they have adapted by losing their chloroplast, the organelles needed for photosynthesis.

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A student pushes a 40-N block across the floor for a distance of 10 m. How much work was done to move the block? Question 3 options: 4 J 40 J 400 J 4,000 J

Answers

Answer:

The work done to move the block is 400 Joules.

Explanation:

It is given that,

Force acting on the block, F = 40 N

The distance covered by the block, d = 10 m

We need to find the work done by the block. The work done by an object is given by :

$W=F* d$

$W=40\ N* 10\ m$

W = 400 Joules

So, the work done to move the block is 400 Joules. Hence, the correct option is (B) "400 J".

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Work = Force x distance

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Answers

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Answer:

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Explanation:

If you cut across the diameter of a pie,what part are you cutting