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Home >All Categories > Science & Mathematics >Physics >Open Question donnaloo... Member since:February 15, 2011Total points:108 (Level 1)A stretched string is fixed at both ends,
202.5 cm apart.
If the density of the string is 0.03 g/cm and
its tension is 600 N, what is the wavelength of
the first harmonic?
Answer in units of cm.
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1. Provide a plausible explanation to describe how a carbon atom from a corn plant in Iowa could end up as a sugar molecule in your body, and later be traced to a tree in Colorado.

2. Is the human population subject to the constraints of environmental resistance factors? Explain.

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QUESTION:
- CMB hot spots have matter density that is about 10^-5 higher than the background average.
Let us consider the evolution of such a hot spot with the opposite assumption as above.
Assume the matter density in the hot spot is sufficient to resist the cosmological expansion and therefore remains constant, while the rest of the universe expands as
a = t^2/3
Compared to today's mean matter density in the universe (30% of the critical density),
how much higher is the matter density in these hot spots today?

it has something to with the density of background = t^-2, and i'm supposed to calculate the ratio based on the times

PLEAAAASEEE HELPPPPP

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