Answer:
P₂ = 2 P₁
we conclude that in the second time the power used is double that in the first rise
Explanation:
In this exercise we are asked the power to climb the stairs, if we assume that we go up with constant speed, we use an energy equal to the potential energy due to the difference in height of the stairs, as this height is constant the potential energy does not change and therefore therefore the energy used by us does not change either.
Now we can analyze the required power,
P = W / t
From the analysis of the previous paragraph the work is equal to the energy used, according to the work energy theorem,
therefore the first time the power is
P₁ = E / 10
P₁ = 0.1 E
for the second time the power is
P₂ = E / 5
P₂ = 0.2 E
we see that the power in the second case is
P₂ = 2 P₁
Therefore, we conclude that in the second time the power used is double that in the first rise.
Answer:
Explanation:
Force of brick = 10 N
Area of surface = 20 cm^2
Pressure = force / area
∴ Pressure = 10 / 20
= 1 / 2 or 0.5 Pa
Hope this hepls
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Answer:
0.397
Explanation:
Divide the volume value by 1000
Answer:
B. The English system is preferred for use in the scientific and technical communities due to its ease of us of the SI system
Explanation:
This is true due to the the fact that in the English system, all you have to do to change from one measurement to the other is just move the decimal place. For example: I have 10 kg of apples and wish to convert it into grams, kilo means 1000 and grams are the base, meaning one, so we will move the decimal place to the right three places (to add the three zeros for 1,000) and the answer will 10,000. Hope you read through this and somewhat get what I mean.
