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katrin2010 [14]

3 years ago

14

Why do you think a human needs only one egg at a time

1 answer:

babunello [35]3 years ago

7 0

Because we can reproduce with just one and if more eggs were released, the female reproductive life (which is 40 years) would be shorter and so there would be less time for every female human to reproduce since the amount of eggs is limited. (Also fraternal twins come from 2 eggs released at the same time)

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choice B

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Ede4ka [16]

Answer:

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the ratio of the energy per second radiated by the filament of a lamp at 250k to that radiated at 2000k, assuming the filament i

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Answer:

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Explanation:

(a)

The power radiated from a black body is given by Stefan Boltzman Law:

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P = Energy Radiated per Second = ?

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So the ratio of power at 250 K to the power at 2000 K is given as:

$\frac{P_{250k}}{P_{2000k}}=\frac{\sigma A(250)^4}{\sigma A(2000)^4}\\\\\frac{P_{250k}}{P_{2000k}}=2.4\ x\ 10^{-4}$

(b)

Now, for 90% radiator blackbody at 2000 K:

$P = (0.9)(5.67\ x\ 10^{-8}\ W/m^2.K^4)(1\ x\ 10^{-6}\ m^2)(2000\ K)^4$

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3 years ago

Starting from rest, a 6.79 kg block slides 2.82 m down a rough 20.7 ◦ incline. The coefficient of kinetic friction between the b

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Answer:

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Work done by the force of gravity is given by

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3 years ago

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Oksanka [162]

Answer:

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3 years ago