I\'m in electricity and magnetism physics. I am having trouble understanding thi

Question

I'm in electricity and magnetism physics. I am having trouble understanding this problem. Can you please explain each step. And show how to check this problem. Thank you
Chapter 21 Problem: Variation of Assum incident energy. a) Make an order-of-magnitude estimate of the a ion of 21.68: The intensity of solar radiation at the top of Earth's atmosphere is 1370 W/m2 ethat 60% of the incoming solar energy reaches the Earth's surface and that you absorb 50% of the m. an order-of-magnitude estimate of the amount of solar energy you absorb in a 60-minute sunbath. Considering that we're 60% water, estimate the term reasonableness water, estimate the temperature change, and comment on its b)

Explanation / Answer

(A) Intensity reaching the earth surface = 0.60 x 1370

= 822 W/m^2

intensity aborbed = 0.50 (822) = 411 W/m^2

effective area of human body is about 0.4 m^2 .

hence energy absorbed per unit time = (411) (0.40)

= 164.4 W

Time = 60 min = 3600 sec

Energy absorbed = 164.4 x 3600 = 5.91 x 10^5 J

Order of magnitude = 10^5 J

(b) Q = m C deltaT

mass of average person = 75 kg

hence m = 0.6 x 75 = 45 kg

5.91 x 10^5 = (45) (4186) (deltaT)

deltaT = 3 deg C

this is reasonable answer.

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