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2 years ago

PLEASE HELP MEEEEEE!!!!!!!!!!!!!!!!!!

Physics

2 answers:

Simora [160]2 years ago

5 0

You would need to freeze it in a freezer. Hope this helps if it does could I have brainlist thanks

MAXImum [283]2 years ago

3 0

When liquid water loses thermal energy, it undergoes freezing : changing state from a liquid to a solid. We see many examples of this in everyday life. Puddles, ponds, lakes, and even parts of oceans freeze when the water becomes cold enough. At low temperatures, Earth's surface water freezes and forms solid ice.

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51.Shoveling snow can be extremely taxing because the arms have such a low efficiency in this activity. Suppose a person shoveli

Komok [63]

Complete question is;

Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a sidewalk metabolizes food at the rate of 800 W. (The efficiency of a person shoveling is 3%.)

(a) What is her useful power output? (b) How long will it take her to lift 3000 kg of snow 1.20 m? (This could be the amount of heavy snow on 20 m of footpath.) (c) How much waste heat transfer in kilojoules will she generate in the process?

Answer:

A) P_out = 24 W

B) t = 1470 s

C) Q = 1140.72 KJ

Explanation:

We are given;

Input Power; P_in = 800 W

Efficiency; η = 3% = 0.03

A) Formula for efficiency is;

η = P_out/P_in

Making P_out the subject, we have;

P_out = η•P_in

P_out = 0.03 × 800

P_out = 24 W

B) We know that;

Power = work done/time taken

Thus;

P_out = mgh/t

We are given;

m = 3000 kg

h = 1.20 m

Thus, time is;

t = (3000 × 9.8 × 1.2)/24

t = 1470 s

C) amount of heat wasted is calculated from;

Q = (P_in - P_out)t

Q = (800 - 24) × 1470

Q = 1,140,720 J

Q = 1140.72 KJ

3 0

2 years ago

What are the reactants

Naddika [18.5K]

Answer:

The reagents correspond to substances that react with others, generating a chemical reaction.

Explanation:

Example:

H2 + 02 -> H202

Hydrogen reacts with oxygen in a synthesis reaction, forming a new compound (hydrogen peroxide) called a product.

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2 years ago

A football player kicks a football in a field goal attempt. When the football reaches its maximum height, what is the relationsh

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while if we check the acceleration of object then it is due to gravity

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so it is along y axis

so here these two physical quantities are perpendicular to each other

so correct answer would be

C)At the maximum height, the velocity and acceleration vectors are perpendicular to each other.

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2 years ago

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Rzqust [24]

Only kinetic

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Okay?

6 0

2 years ago

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State coulombs law in word

amid [387]

<h2>state coulombs law in word</h2>

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2 years ago