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Phys 1403 Mid Term Review Questions And Answers Latest Update
- Course
- PHYS 143
- Institution
- University Of Illinois - Urbana-Champaign
Phys 1403 Mid Term Review Questions And Answers Latest Update
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Phys 1403 Mid Term ReviewQuestions And Answers Latest
Update
On the summer solstice the Sun is farthest north of the celestial equator
halting its northward movement. ANS✔✔ True.
The seasons are caused by Earth's tilt and its orbital motion.
On the summer solstice the noon time sun in th northern hemisphere will
reach it's highest (most northern) point in the sky. It will be north of the
celestial equator by 23.5 degrees. This is the longest day of the year.
On the winter soltice the noon time sun in the northern hemisphere will reach
its lowest (most southern) point in the sky. This is the shortest day of the year.
Onthe summer solstice the Earth's southern hemisphere is tilted toward the
Sun. ANS✔✔ False.
The seasons are caused by Earth's tilt and its orbital motion.
During summer soltice the northern hemisphere is tilted toward the Sun.
At this time it is summer in the northern hemisphere where the light is more
intense and winter in the southern hemisphere where the light is less intense.
In which direction does the Sun move along the ecliptic? ANS✔✔ Eastward
,If you could see the stars during the day, the Sun would appear to move along
the zodiac throughout the year.
Precession of the rotation axis of Earth is caused by Earth's magnetic field.
ANS✔✔ False.
The earth's rotation axis is processing or moving in a circle. It takes 26,000
years for the axis to make one complete trip.
This is caused by the force of the Sun and Moon's gravity on Earth's equatorial
bulge.
You live in Killeen, TX at a latitude of 31° N. What is the angle between the
northern horizon and the North Celestial Pole? ANS✔✔ 31°
The Earth's rotation axis points toward the North Celestial Pole (very near
Polaris) . For this reason an observer in the northern hemisphere will see
Polaris above the northern horizon at an angle equal to their latitude.
You live at a latitude of 20° S. What is the angle between the southern horizon
and the South Celestial Pole? ANS✔✔ 20°
In the southern hemisphere, observers can not see Polaris.
The South Celestial
Pole is above the southern horizon by an angle equal to the observer's latitude.
You live at a latitude of 54° N. What is the angle between the southern horizon
and the Sun at noon on the vernal equinox? ANS✔✔ 36°
,At equinox the Sun will rise to the Celestial Equator. In the northern
hemisphere, the celestial equator is above the southern horizon at an angle
complementary to the observer's latitude.
In this situation, the Sun will be 90 - 54= 36above the southern horizon.
You live at a latitude of 54° N. What is the angle between the southern horizon
and the Sun at noon on the summer solstice? ANS✔✔ 59.5°
On the summer solstice the Sun will be 23.5 above the equator. This means
that it will be 23.5above the Celestial Equator. So first locate the Celestial
Equator and then add 23.5
90 - 54= 36
36 + 23.5= 59.5
You live at a latitude of 54° N. What is the angle between the southern horizon
and the Sun at noon on the winter solstice? ANS✔✔ 12.5°
On the winter solstice the Sun will be 23.5 below the equator. This means that
it will be 23.5below the Celestial Equator. So first locate the Celestial Equator
and then subtract 23.5
90 - 54= 36
36 - 23.5= 12.5
A lunar eclipse occurs when the Earth passes between the Earth's moon and
the Sun. ANS✔✔ True
, Lunar eclipses only occur during full moon and when the moon is on or near
the ecliptic. (Earth's orbital plane)
Finally, lunar eclipses only occur when the Earth passes between the Moon
and the Sun, so that Earth's shadow falls on the Moon.
A total lunar eclipse will occur when the Moon is inside the Earth's penumbra.
ANS✔✔ False
Total lunar eclipses occur:
•During full moon
•When the moon is on or near the ecliptic. (Earth's orbital plane)
•When the Moon is in Earth's umbra Lunar eclipses are visible by all observers
on Earth who can see the Moon at that time. During totality the Moon will
glow a coppery red since bluer light is scattered by the Earth's atmosphere.
Eclipses
A solar or lunar eclipse will occur when the Sun is near the line of nodes, and
the moon is new or full. ANS✔✔ True
Eclipse seasons occur when the Sun crosses the Moon's line of nodes. If the
Moon is new at that time a solar eclipse may occur. If the Moon is full a lunar
eclipse may occur.
The line of nodes is a line drawn between the two points where the Moon's
orbit intersect the Earth's orbital plane. Each of these points is called a node of
the moon's orbit.
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