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svetlana [45]
3 years ago
12

Two students designed an experiment to study the effect of solar radiations on four cities of Earth. They used a globe to repres

ent Earth and a light bulb to represent the sun. The four cities were labeled A, B, C, and D on the globe at the latitudes shown in the chart below. City Latitude A 33° 53' S B 64° 03' N C 39° 56' N D 2° 09' S The students moved the globe slowly around the light bulb in an elliptical orbit. Based on the experiment, the students are most likely to conclude that the least variation in seasons will be experienced at City A City B City C City D
Physics
1 answer:
Furkat [3]3 years ago
3 0
Great experiment !  Everybody should try it if they can get the equipment. 
It demonstrates a lot of things that are very hard to explain in words. 

I hope the students remembered to tilt the axis of the globe.  If they didn't,
and instead kept it straight up and down, then each city had pretty much
the same amount of bulb-light all the way around, and there were no seasons.

If the axis of the globe was tilted, then City-D had the least variation in
seasons.  City-D is only 2° from the equator, so the sun is more direct
there all year around than it is at any of the others.
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Answer:

m =8.81*10^{-6}grams

time t = 52.8 year

Explanation:

GIVEN DATA:

the half life of the CO-60 is, T_1/2 = 5.27 years = 1.663 e+8 s

activity dN/dt = 1 mCi = 3.7 X 10^7 decay/s

activity ,  dN/dt = N* \lambda

              \frac{dN}{dt} = N* \frac{ln2}{T_1/2}

                   N = \frac{(dN/dt )(T1/2)}{ln2}

                      = ( 3.7 X 10^7 )(1.663*10^8 ) / ln2

                      = 8.877*10^{16}

Number of moles:

     n = N/NA = 8.877*10^{16} / 6.022X10^23 = 1.474*10^{-7} mol

mass of the CO-60 is,

   m = n*M = [1.474*10^{-7} mol]*[59.93 grams /mol] = 8.81*10^{-6}grams

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    time t = -[T1/2 / ln2]*ln[N/N0]

             = - [5.3 years / ln2]*ln[1x10-6/1x10-3]

             = 52.8 year

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A microwave oven operates on the principle that application of a high-frequency field causes electrically polarized molecules su
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Answer:

a

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The time it would take to heat the beef to uniform temperature of 80⁰C is

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c

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Explanation:

The explanation is shown on the first second and third uploaded image

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