ReasoningLab (1)
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Florida International University *
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Course
1002L
Subject
Astronomy
Date
Jan 9, 2024
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Lab 2
for Descriptive Astronomy Labs
NAME: Sachintha Peiris
SECTION: RVC RVF RVD RVE 1238
1. Stars in Universe.
How many stars are there in the Universe?
Solution:
Assumptions
:
According to astronomers, there are probably more than 170 billion galaxies in the observable
Universe. Our Galaxy Milky Way contains up to 400 billion stars of various masses and
brightnesses. There are spiral galaxies out there with more than a trillion stars, and giant elliptical
galaxies with 100 trillion stars. And there are tiny dwarf galaxies with a fraction of our number
of stars. So we will assume our galaxy to be an average galaxy.
Calculations (show work!):
Total Stars = 170,000,000,000 galaxies × 400,000,000,000 stars/galaxy
Answer:
Total Stars = 68,000,000,000,000,000,000,000 stars
(68 sextillion)
Lab 2
for Descriptive Astronomy Labs
2. Heartbeats
How many times does a person's heartbeat in a lifetime?
Solution:
Assumptions (show work!)
:
Average resting heart rate: 72 beats per minute
Average life span: 78 years
Calculations (show work!):
Number of minutes in a year:
60 minutes/hour and 24 hours/day: 60x 24 = 1,440 minutes/day. * 365 days/year
Minutes per Year:
1,440 minutes/day x 365 days/year =
525,600 minutes/year
Heartbeats in a Year:
72 bpm x 525,600 minutes/year =
37,843,200 beats/year
Total Heartbeats in a Lifetime:
7,843,200 beats/year x 78 years -
2,953,753,600 beats
Answer:
2,953,753,600 beats
(2.95 billion)
Lab 2
for Descriptive Astronomy Labs
In this last exercise we will be able to experimentally test our answer! Have
fun!
3. Please chose between Option 1 and Option 2
to complete part 3.
Option 2:
Roll-Over -- how many time would you need to roll on the ground to cover a
distance of 12 meters?
Measure the width of your body. Measure a distance of 12 meters, it does not have to be one
straight line if you have a smaller room: consider rolling from one wall to the next several times.
Count full body rotations only: if you start face up, returning to face up position completes one
full roll. Round up partial rolls both in your calculations and experimental verification. Ask
someone to take a video of your experimental verification or place a cell phone in such a way to
at least record your partial effort. I just need some kind of evidence that you did the experiment.
Share your effort on the dedicated blog page -- if you are not comfortable, attach your video
here, or email to me directly.
Solution:
Assumptions (what you need to assume about the different parts of your body)
:
Data
:
Body width
= ___45.72_____
centimeters
.
Convert cm to meters =
____0.4572____
Distance to roll
=
____12____
m
.
Calculations (show work!):
Body width * 2 = 0.4572*2 = 0.9144 m = one full roll
Number of Rolls = Distance to roll / one full roll
Number of Rolls = 12 meters / 0.9144 meters = 13.1233596 rolls
Number of Rolls (rounded up) = 14 rolls
Answer:
I need to roll
___14__________times to cover a distance of 12 meters!
Now, verify your answer experimentally by rolling 12 meters on the ground and see if you were
right!
Did you estimate too much or not enough?
Answer:
___________too
much__________________
By about how much?
Answer:
________________1 m_________________
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Lab 2
for Descriptive Astronomy Labs
Required: Take a video of your effort and upload it the class blog!