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MAXImum [283]
3 years ago
9

What is the total distance the hiker walked ? A.4 km B.6 km C.10 km D.20 km/

Physics
1 answer:
Sav [38]3 years ago
4 0

Answer: the answer is c

Explanation:

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A solar water heater for domestic hot-water supply uses solar collecting panels with a collection efficiency of 40.0 % in a loca
Stells [14]

Answer:

46.19 L

Explanation:

The efficiency of the solar water heater is 40% which means 40% of the solar energy is converted to useful energy, ie. used to heat the water.

Useful energy = P = solar energy * available area * efficiency

P = 200 W/m^2 * 29.5 m^2 * 40%

P = 2360 W = 2.36 kJ/s

This means that 2.36 kJ of useful energy will be utilized per second. Converting this to the useful energy in hour gives us:

Average energy in one hour = 2.36 kJ/s * 3600 s/h = 8496 kJ

The specific heat capacity of water is 4.18 kJ/kg.C which means it will take 4.18 kJ of energy to raise the temperature of 1 kg of water by 1 degree C. Equating the energy change of the water for the given temperature rise and mass (unknown) to the useful energy utilized in one hour, we can solve to determine the unknown mass. This will give us the mass of water heated in one hour:

Energy = mass * specific heat capacity * (final temperature - initial temperature)

8496 = mass * 4.18 * (60 - 16)

mass = 46.19 kg

Lastly, this mass has to be converted to volume. Assuming density of water is constant through out the heating process:

volume = mass / density

volume = 46.19 kg / 1 kg/L

volume = 46.19 L

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3 years ago
What does the atomic number respresent?<br><br> (From my science homework)
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It represents where it is located in the periodic table and how many protons a element has. 
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Question 6 of 10
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The answer is C.89,866. I multiplied 262x343.
3 0
2 years ago
The higher the voltage across a bulb the b__________ it is.
podryga [215]

Answer:

Brighter

Explanation:

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How are the concepts of impulse and momentum related?
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Answer:

The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • Δ v. In a collision, objects experience an impulse; the impulse causes and is equal to the change in momentum. ... The collision would change the halfback's speed and thus his momentum.

Explanation:

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