Week 1 Assigned Homework Presentations

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University of Maryland Global Campus (UMGC) *

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Course

100

Subject

Astronomy

Date

Dec 6, 2023

Type

docx

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3

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There are 10 Homework Problems This Week Important: In homework and quiz calculations formulas from the astronomy formula sheet should always be used. Formulas from the textbook may contain errors or may be approximations. [1] Given that an astronomical unit (AU) is 1.50 x 10^11 m and a light-year is 9.46 x 10^15 m, how many astronomical units are in a light-year? Student Responsible for Posting Solution: Naiya Young [2] Calculate approximately how long it takes light to travel from the Sun to the dwarf planet Eris. Note: the average distance between Eris and the Sun is thought to be 1.0120 x 10^10 km. Student Responsible for Posting Solution: Courtenay Wood [3] Using scientific notation, numerically evaluate the expression below. Do this problem without using a calculator. Show all of your steps. [ 10^5 x (10^2)^3 ] / [ 100 x 10^4 x (10^8)^(1/2) ] Student Responsible for Posting Solution: Yoobin Wom [4] Using scientific notation, numerically evaluate the expression below. Do this problem without using a calculator. Show all of your steps. (8 x 10^6)^2 / (2 x 10^-3)^3 Student Responsible for Posting Solution: Daylin Williams [5] Using scientific notation, numerically evaluate the expression below. Do this problem without using a calculator. Show all of your steps. (3 x 10^5)^2 / (4 x 10^4)^(1/2)
Student Responsible for Posting Solution: Michael Tremaine [6] The great galaxy in Andromeda has an angular diameter along its long axis of about 5 degrees. It's distance from Earth is about 2.2 million light-years. Calculate its linear diameter. Hint: look for a formula relating the following variables (formula #15) D = distance A = angular diameter (in degrees) L = linear diameter Student Responsible for Posting Solution: Matthew Thomas [7] Suppose a planet orbits a nearby star every 125 years. If that star is identical to the Sun, how could you find the planet's distance from its star? If the planets orbit is a perfect circle, how far from the star is the planet in astronomical units? Student Responsible for Posting Solution: Gabrielle Stade [8] A new telescope reveals a planet about 16 AU from a star whose mass is the same as the Sun. How long does it take this planet to orbit its star? Student Responsible for Posting Solution: Jumany Sheriff [9] Use Newton's Law of Gravity to calculate the force on a 60 kg person on the surface of Mars. This force is their weight on Mars. Data: the mass of Mars is 6.42 x 10^23 kg and it has a radius of 3396 km (3.396 x 10^6 m). Student Responsible for Posting Solution: Joeseph Schweitzer [10] Use Newton's Law of Gravity to calculate the force on a 60 kg person on the surface of Earth. This force is their weight on Earth. Data: the mass of Earth is 5.97 x 10^24 kg and it has a radius of 6378 km (6.378 x 10^6 m). Student Responsible for Posting Solution: Kyle Saffell
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