When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the

Physics

1 answer:

Lilit [14]3 years ago

3 0

Answer: The redshift occurs because the starts are moving away from the earth.

Explanation:

Every object emits wavelength from its body. When it comes to universe there are some visible light emitted by the stars and other objects in galaxy.

If a star is moving towards the sun then it emits a shorter wavelength compared to the source which is at rest. This is blue in color called as blue shift.

But when it comes to stars they move away from the earth and hence emits longer wavelength called as red shift.

As the object it at rest it more towards the blue side and when the objects starts moving it starts moving towards the red side in the visible spectrum.

So, when the starts moves away from the earth it forms a Redshift.

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Debora [2.8K]

Answer:

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2 years ago

A raft is made of 12 logs lashed together. Each is 45 cm in diameter and has a length of 6.5 m. How many people can the raft hol

tatyana61 [14]

Answer:

324 people

Explanation:

radius r = diameter / 2 = 45cm /2 = 22.5 cm or 0.225 m

We can calculate the total volume of the log by computing the volume of each cylindrical log:

$V = \pi r^2 L = \pi 0.225^2 * 6.5 = 4.6 m^3$

So the total volume of all 12 logs is

$12 * 4.6 = 55.135 m^3$

The weight that the raft can support, is the buoyancy force subtracted by its own weight.

The buoyancy force is basically the weight of the water is displaced, which is water density times volume. The log weight is also log density times its volume

$F = F_b - F_w = g\rho_wV - g\rho_rV = gV(\rho_w - \rho_r)$