20. Answer is "it reflects sunlight".<span>
<span>The moon is </span>not a star<span> <span>as sun.
Hence, </span></span>moon can't produce light by itself<span>. The only reason that we can see the moon is </span>it reflects the sunlight<span>. According to the distance from the
sun to the moon, the light reflection can be varied.</span>
21. Answer is "Jupiter".
Asteroid
belt<span> <span>is
a </span></span>region which is located between
Mars and Jupiter and consists of asteroids and minor planets.<span> This asteroid belt has the </span>4%<span> <span>as the
mass </span>of our moon. Due to the </span>Jupiter's strong gravity<span>, it is </span>prevented a forming of new planet by this asteroid belt.
22.<span> Answer is "</span>they are equal".
The period of
revolution is
the time which is taken by a
mass to go completely one round around another mass. For moon, the period of revolution is 27 days.<span>
The period of
rotation</span> is
the time taken by a mass to complete
one round around its own axis. It is about 27 days for moon.
</span>23.<span> Answer is "</span>The moon is in Earth's shadow".
<span>Lunar eclipse happens when </span>Sun, Earth and moon are directly
aligned each other <span>and Earth is located in between the Sun and the
moon. </span>Then the moon is covered by the
Earth's shadow.
24.<span> Answer is "</span>In a solar eclipse, it is Earth that is caught in the umbra
of the moon. In a lunar eclipse, it is the moon that is caught in the umbra of
Earth".
In total lunar eclipse, Earth is located
between Sun and the moon and
they are directly aligned to each other. The moon is totally covered with the Earth's
shadow.
Total solar eclipse can be seen when the
moon is located between sun and Earth by completely covering the sun.
25. According
to the given choices, we can get "Apollo"<span> as the answer.
Apollo 8 is the first
manned mission to the moon. From
that there were several manned mission including <span>first
manned landing on the moon. The Apollo program was conducted by USA.</span> </span>
Answer:
I believe physical
Explanation:
If you step on the bag of chips, it would reduce them to crumbs. Wouldn't this be a physical change in the chips?
Answer:
Option D will be the answer.
Answer:
79.74*10^6 Pa
Explanation:
Based on the parameters provided, we have:
ε = ln()
Where initial gauge length = 3 cm and the final gauge length is 3.5 cm. Therefore:
ε = ln(3.5/3) = ln(1.167) = 0.154
Similarly,
σ = F/[3.142*(di^2)/4]
Where σ = 120*10^6 Pa and di = 1 cm = 0.01 m
Therefore,
F = 120*10^6 * 3.142*(0.01^2)/4 = 9426 N
σ = F/[3.142*(df^2)/4 = 9426/[3.142*(0.00926^2)/4 = 9426/6.74*10^-5 = 139.95*10^6 Pa
σ = k*ε = 139.95*10^6
k = 139.95*10^6/(0.154)^0.5 = 356.63*10^6 Pa
Therefore, when ε = 0.05 cm/cm
σ = 356.63*10^6 (0.05)^0.5 = 79.74*10^6 Pa
Answer:
1. mixture
2. Homogenous
Explanation:
Copper II chloride is a compound because it consists of elements that are chemically combined together. When a solute in this case, copper II chloride is mixed with water- a solvent, the result is a homogenous mixture.
Homogenous substances are formed when a solute and a solvent combine, resulting in a mixture with uniform properties. Mixtures can be separated using relevant separation techniques.