Which lighting direction is used to create silhouettes?
2 answers:
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Answer:
°C
Explanation:
Given:
mass of hiker, m= 63 kg
height to be climbed, h= 828 m
energy produced by an energy bar,
heat capacity of the hiker,
initial body temperature of hiker,
<em>The efficiency of converting the energy content of the bars into the work of climbing is 25%, the remaining 75% of the energy released through metabolism is heat released to her body.</em>
We find the energy required for climbing 828 m height:
W=m.g.h
W= 511207.2 J
∵Hike eats 2 energy bars=
Energy produced
Now, according to her efficiency:
Total energy required for producing the work of W= 511207.2 J which is required to climb the given height will be (say, E):
&
Amount of total energy (E) converted into heat(Q) is:
As we know that:
heat, .................(1)
where:
is the final temperature
Putting respective values in the eq. (1)
°C
Answer:
a) There are electrons in a liter of water.
b) The net charge is -53601707,1 C
Explanation:
a) To find out how many electrons are in a liter of water (equivalent to 1000 grams of water), we have to find out how many molecules of water there are and then multiply it by 10 (e- per molecule).
We can find out how many molecules are by finding the number of moles and then multiplying it by Avogadro's number (number of elements per mol):
b) As all electrons have the same charge, in order to find the net charge of those electrons we have to multiply the charge of a single electron by the number of electrons:
An important clarification is that while the net charge may seem huge, water as a whole is a neutral medium, because there are as many protons as there are electrons, and as they have the same charge, the net charge of water is 0.