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Gnom [1K]
3 years ago
5

I need help with 5 please and thank you

Physics
1 answer:
Likurg_2 [28]3 years ago
7 0

Answer: A

Explanation:

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Advantages: Very sturdy, can have several cracks in structure before breaking

disadvantages: best for short distances, not attractive, hard to maintain

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Scientists have proven that genes play no role in self-esteem. Please select the best answer from the choices provided. T F
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A Boy can raise a load of 200N up to a<br>height of 2.5m in 15 seconds. calculate his<br>power​
shtirl [24]

Explanation:

f=mg

=200×10

=200N

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3 years ago
Calculate the temperature change when 1000J of heat is supplied to 100g of water.<br> Please explain
jasenka [17]

Answer:

It is sensible heat- the amount of heat absorbed by 1 kg of water when heated at a constant pressure from freezing point 0 degree Celsius to the temperature of formation of steam i.e. saturation temperature

So it is given as - mass× specific heat × rise in temperature

i.e. 4.2 × T

4.2 × (100–0)

So it is 420kj

If you ask how much quantity of heat is required to convert 1 kg of ice into vapour then you have to add latent heat of fusion that is 336 kj/kg and latent heat of vaporization 2257 kj/kg (these two process occur at constant temperature so need to add rise in tempeature)

So it will be

Q= 1×336 + 1× 4.18 ×100 + 1× 2257

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Or 3.1 Mj

Hope you got this!!!!!!

5 0
2 years ago
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What happens when a substance undergoes a physical change
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Physical changes are those which do not affect the chemical properties of a substance. For example, when a paper is cut, the two pieces obtained are still paper. The chemical properties have not changed. Only, physically when one piece is cut to two. A chemical change occurs when the chemical properties change and a new substance with different chemical properties is obtained. For example, when the paper is burnt, it turns to ashes. Hence, this is a chemical change.

When a substance undergoes a physical change, the physical properties of the substance changes like the state (solid to liquid during melting), shape, size, volume etc. Many physical changes are reversible whereas, in general many chemical changes are irreversible.

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4 years ago
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