The formula for dB in voltage (or current) is 20*log(V2/V1). Here that's 20*log(5/10)=-6dB. This is the value you can always expect when the output voltage or current is half of the input. The 20 comes from 2*10. The 10 is there because these are deci-bels and not bels. The 2 is there because the decibel is a measure of ratios of powers. Power in electric is proportional to the square of voltage or the square of current. Because of the rules of logarithms, the 2 exponent of the square is brought out front in the equation as a multiplier. Therefore in comparing output Power to input Power given in watts, you don't need the 2, and use only the formula 10*log(P2/P1). For half power its -3dB. But for your answer its -6dB
81.552N•S if am wrong am very sorry
The bee is then <em>11.314 meters northwest</em> of where he started.
Answer:
water is in the vapor state,
Explanation:
We must use calorimetry equations to find the final water temperatures. We assume that all energy is transformed into heat
E = Q₁ +
Where Q1 is the heat required to bring water from the current temperature to the boiling point
Q₁ = m ( -T₀)
Q₁ = 50 4180 (100 - 37)
Q₁ = 1.317 10⁷ J
Let's calculate the energy so that all the water changes state
= m L
= 50 2,256 106
= 1,128 10⁸ J
Let's look for the energy needed to convert all the water into steam is
Qt = Q₁ +
Qt = 1.317 107 + 11.28 107
Qt = 12,597 10⁷ J
Let's calculate how much energy is left to heat the water vapor
ΔE = E - Qt
ΔE = 10¹⁰ - 12,597 10⁷
ΔE = 1000 107 - 12,597 107
ΔE = 987.4 10⁷ J
With this energy we heat the steam, clear the final temperature
Q = ΔE = m ( -To)
( -T₀) = ΔE / m
= T₀ + ΔE / m
= 100 + 987.4 10⁷ / (50 1970)
= 100 + 1,002 10⁵
= 1,003 10⁵ ° C
This result indicates that the water is in the vapor state, in realizing at this temperature the water will be dissociated into its hydrogen and oxygen components
Answer:
11 PM of the same day.
Explanation:
As the earth rotates, big dipper also seems to circulate around the sky near the north star. When we look at it from ground it appears to us as it is at different angels. They usually complete a full circle once a day in approximately 23 hours.