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Geography

2 answers:

Jlenok [28]2 years ago

8 0

Answer:

the moon moves into the shadow of the earth.

Explanation:

the sun shines on the earth, then as the mopn rotates, the shadow of the earth is cast on the moon which is the only natural satillite the earth has

tangare [24]2 years ago

6 0

Answer:

I believe the answer would be A. the moon moves into the shadow of the earth.

Explanation:

The shine from the moon at night comes from the sun and when the moon is covered by the earth, you cant see anything because the earth is blocking the sun from hitting the moon. You get what i'm saying?

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If the half life for strontium-90 is approximately 28 years, then what is the whole life for strontium-90?

sveta [45]

Set this up as

10 = 40 (1/2)t/28

and solve for t in years.

10/40 = (1/2)t/28

log(0.25) = (t/28) log(0.5)

t = 28 log(0.25) / log(0.5) years = 56 years

Test the answer:

56 years = 2(28 years) = 2 half-lives, so the remaining amount should be 1/2 of 1/2 of the initial amount, i.e. 1/4 of the initial amount, and 10 mg = 1/4 of 40 mg.

7 0

2 years ago

World oil reserves amount to about 10,000 EJ, and humankind uses energy at the rate of roughly 18 TW. If all our energy came fro

Volgvan

Answer:

t=17.61 years.

Explanation:

Given that

Reserve of energy = 10,000 EJ

Energy used by human = 18 TW

We know that

$1\ E= 10^{18}$