Second Chapter 1 Homework for FSU Astronomy

This astronomy assignment is to be submitted on-line at least one hour before class begins.

Place your response for each item in the corresponding text box. You may change your mind as often as you wish. When you are satisfied, click the SUBMIT HOMEWORK button at the bottom of the page.

Name (first and last):

On the computer, we will be using the "^" symbol to denote that the number following the ^ is an exponent. Thus 2^3 stands for 2x2x2, cm^3 stands for cubic cm. This can be used to write a number in scientific notation, e.g., 2300 can be written as 2.3x10^3. We will also use the convention of representing x 10^ with E. Thus 6.2E4 represents 6.2 x 10^4.

These problems correspond to the following pages in our text: 30-31

Review and Discussion

All even questions. It is permissible to paraphrase material from the text if it is an appropriate response. Copying word-for-word from the text is an inappropriate response and will not earn credit. Five points possible.

More math refreshment - for up to 1/2 point per question.

One. 3(x+y)/2 when x=14 and y=-12.

Two. 4xy/(y+3x) + 5 when x=32 and y=-17.

Three. (x+z)/y + xy/2 when x=7, y=2, and z=6.

Four. Solve: 3x + 22 = 41

Five. Solve: 5/(2x-3) = -5/(3x+2)

Six. Express 83,000 in powers-of-10 notation.

Seven. Express 0.0000089 in powers-of-10 notation.

Eight. Express 3.722E-7 in decimal notation.

Nine. Express 7.182E13 in decimal notation.

Ten. Evaluate 2000 x 600,000 / 0.0000002

Eleven. Evaluate 1.5E-9 / (5.9E2 x 2.2E-5)

Twelve. Evaluate 2E-4 x 1.9E13 / 9.2E11

Thirteen. For up to 2 points extra-credit.
Why does a calculator indicate an error when you enter 1/0? What is a mathematical description of this ratio?

Conceptual T or F,

All even problems (enter T or F for each). You will find the answers for these questions in the back of the book. However, you are expected to understand these questions and the answers - these topics are subject to inclusion on both chapter tests and the final test.

Conceptual Multiple Choice

All even problems (enter a letter for each). You will find the answers for these questions in the back of the book. However, you are expected to understand these questions and the answers - these topics are subject to inclusion on both chapter tests and the final test.

Problems

Some of the problems assigned have been altered from the text - answers are given in the text for the original odd problems - check them if you are in doubt about approaching any of the odd problem. You are to answer the question as stated on the page. You must show your work. Partial credit may be awarded.

Problem 1.
In 10 minutes, light leaving Los Angeles reaches approximately how far?

Problem 3.
How, and by how much would the the length of the solar day change if the Earth's revolution around the Sun took a very long time (a billion years for example).

Problem 14. For up to 3 points extra-credit.
Show a calulation of the distance the Earth moves because of its revolution about the Sun in (a) a minute, (b) an day?

Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", what's happening in your life that you want your instructor to know about, etc.):

When you are satisfied with your responses click this button. If all goes well, you well immediately see a new page with the statement,"Your ...was received...". If you don't see this new page, it is likely that your submission was not successful. In this case, you should use the back button on your browser to return to this page and resubmit. Repeat until you see "Your ... was received..." appear. If this doesn't happen, you should use the back button to return to this page, print this form with your responses, and take the printout to your instructor before class. Alternatively, you may paste your responses into an e-mail and send it to your instructor, JMattox@uncfsu.edu.

Your instructor will bring a printout of your submission to class along with what are considered correct responses. We will then discuss these questions in class to the extent that there is interest.