Transcript Homework 12 1. How would phases change if the Moon were the

Homework for 4/30/2007
Post-instructional survey 4:
Posted at my web page
Homework 12
1. How would phases change if the Moon were
the same size as Earth, but still had the same
mass?
The phases would be the same shape, but the
visible portion of the moon would appear larger
to the eye.
3 correct answer or drawing
2 incorrect answer or drawing
1 attempt, but both answer and drawing incorrect
Homework 11
2. How would tides change if the Moon were the
same size as Earth, but still had the same mass?
The tides would be mostly unaffected because
the mass of the Moon would remain the same
and so the gravitational force would be nearly
the same. There would be different distances of
parts of the Moon from the Earth, but that would
result in a very small effect.
Drawings not
to scale.
3 correct answer or drawing
2 incorrect answer or drawing
1 attempt, but both answer and drawing incorrect
Homework 11
3. How would eclipses change if the Moon were the
same size as Earth, but still had the same mass?
Both total and partial solar eclipses would be more
frequent because there is a greater chance that the
larger Moon would block the Sun. The Earth will
have more Moon to block, but a bigger target. Their
will be more partial lunar eclipses and fewer total
lunar eclipses.
Drawings not
to scale.
4 correct answer and drawing
3 correct answer or drawing (not both)
2 incorrect answer or drawing
1 attempt, but both answer and drawing incorrect
We live about 100 yrs
Stars like our Sun live about 10,000,000,000 yrs
If we studied a star all of our life we could see
only a small fraction of the star’s life.
1
100000000
So how do we know anything about the life of a star?
Meet Zip from Ip
Zip has the same problem observing us.
Zip and his kind live only about 30 seconds
and we live about 100 yrs.
If zip studied us all of his life he could see
only a small fraction of our life.
1
100000000
So what can Zip do?
Zip is very intelligent and very fast. He can take
measurements of a lot of different people and
try to make sense of them.
Classification
Activity
Edward Pickering’s “computers”
Williamina Fleming
Annie Jump Cannon
Antonia Maury
Cecilia Payne-Gaposchkin
Taking the
temperature
of stars
Well-known
Nearest
Brightest
Hipparcos – 20,000
A thimble full of neutron star
material would weigh around
100 million tons – a good sized
terrestrial mountain.
A 70 kg person standing on the
surface of a typical neutron star
would weigh around 1 million tons.
The person would be flattened to
much less than the thickness of a
sheet of paper due to the
differential pull of gravity.
Watching an robot astronaut
approach the event horizon (the
point where light can’t escape)
from a safe distance we would
observe
-> light from his flashlight would be
Everything
would
appear (red
shifted
to longer
wavelengths
shifted)
until
it was no
visible to
perfectly
normal
to longer
the robot
the
human
eye
until
he crossed
the event
->
his watch would appear to run more
horizon.
slowly
A Trip Through the
Universe
Hundreds of
billions of galaxies
with hundreds of
billions of stars
Material from which the final exam
will be drawn:
A.
B.
C.
D.
E.
F.
Text and handout content readings.
Diagnoser assignments.
Pre/Post-assessment.
Classroom activities (notebooks).
Homework.
Power Points from class.
The exam will have:
A. Short discussion questions.
B. Multiple choice.
C. Question(s) on a live
demonstration.
D. Performance part.
Classroom Activities Since Exam 2:
A.
B.
C.
D.
E.
F.
G.
NASA CONNECT Virtual Earth
Predicting the Weather
Food Web
Water Cycle
Earth Station Activities
Sun-Earth-Moon Relationships
Classification of Stars
Principles and Fundamental Concepts:
A.
B.
C.
D.
E.
F.
G.
Earth systems
Earth cycles
Earth structure
Earth processes
Earth-Moon-Sun connection
Planetary system
Stars and Galaxies