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Sidana [21]
3 years ago
13

NEED HELP PLEASE 15 POINTS PLEASEE NEED HELP

Physics
2 answers:
Ostrovityanka [42]3 years ago
5 0

Answer:

I wish I knew

Explanation:

Reil [10]3 years ago
5 0

Answer: The third one

Explanation:

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Please help me . i need to answer it asap thankyou​
alex41 [277]

The amount of heat needed to melt the block of lead is 5.4\cdot 10^4 J

Explanation:

The amount of heat needed to melt a solid substance already at its melting point is given by the equation

Q=m \lambda_f

where

m is the mass of the substance

\lambda_f is the specific latent heat of fusion

In this problem, we have a block of lead already at its melting point, 327^{\circ}C. Its mass is

m = 200 g = 0.2 kg

and its specific latent heat of fusion is

\lambda_f = 2.7\cdot 10^5 J/kg

Therefore, the amount of heat needed for the block to completely melt is

Q=(0.2)(2.7\cdot 10^5)=5.4\cdot 10^4 J

Learn more about specific heat:

brainly.com/question/3032746

brainly.com/question/4759369

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3 years ago
How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
kicyunya [14]

The answer is a

the equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen or a carbon

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1. Two boxes stacked on top of one another weigh 100 kg total. They apply
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Answer:

150

Explanation:

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