The table below shows some of the stars in our galaxy and their numbers of light years from the Sun.
1 answer:
Answer:
- <u><em>Tau Ceti, 11.9 light years from the Sun</em></u>
Explanation:
The table is:
<em>Star Light Years from the Sun</em>
<em>Chara 27.3 light years</em>
<em>Tau Ceti 11.9 light years</em>
<em>Zeta Leporis 70.2 light years</em>
<em>Epsilon Reticuli 59.5 light years</em>
<em>Light years</em> is a unit of distance. It is the distance that the light travels in one year.
Since the speed of light is a constant, ≈ 300,000,000 m/s, one light year is equal to the product of
by the number of seconds in a year (about 31,540,000 seconds).
Thus, the smaller the number of light years a star is from the Sun the closer the distance between the star and the Sun.
Rank the distances in increasing order:
- 11.9 light years < 27.3 light years < 59.5 light years < 70.2 light years
Then, Tau Ceti, with 11.9 light years is the closest to the Sun.
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Answer:
6 stages
Explanation:
Given:
Copper ore contains:
4.3 wt% water
10.3 wt% CuSO₄
85.3 wt% rock
Feed rate = 11.7 tons per hour
solution produced is to be 10 wt% copper sulfate
90 wt% water
Now,
The CuSO₄ supplied through the feed = 10.3 wt% CuSO₄ × Feed rate
= 0.103 × 11.7
= 1.2051 tons per hour
also,
At each stage 2 tons of solution is collected
therefore,
The CuSO₄ collected in each stage
= weight of solution × 10 wt% copper sulfate
= 2 tons per hour × 0.1
= 0.2 tons per hour
also,
98% of the CuSO₄ is to be recovered
thus,
the amount of CuSO₄ to be recovered
= 0.98 × CuSO₄ supplied through the feed
= 0.98 × 1.2051 tons per hour
= 1.180998
Therefore,
The number of stages required =
=
= 5.90499 ≈ 6 stages