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pychu [463]
3 years ago
7

A particular star cluster contains stars all with the same apparent magnitude of +4. Near the cluster (and at the same distance

from the Earth) is a single star with an apparent magnitude of +1. The star's brightness appears to be the same as the collective brightness of the entire cluster.
How many stars are in this cluster?
Physics
1 answer:
777dan777 [17]3 years ago
5 0

Answer:

3,000 stars.

Explanation:

Subtract the magnitude of the single star from the magnitude of the star cluster.

(+4) - (+1) = +3

Then multiply your answer by 1000

= 3,000 is a stars.

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The weight of a metal bracelet is measured to be 0.10400 N in air and 0.08400 N when immersed in water. Find its density.
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Answer:

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Explanation:

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The weight of metal in air is

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The weight of metal in water is

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F_{b}=0.02\ N

We know that,

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\rho_{w} Vg=0.02

Put the value of Vg in equation (II)

\rho_{w}\times\dfrac{0.10400}{\rho_{m}}=0.02

1000\times\dfrac{0.10400}{0.02}=\rho_{m}

\rho_{m}=5200\ kg/m^3

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