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Chaisson and McMillan - Astronomy Today 5/e (Homework)

Chris Read

Addison Wesley, section 1, Fall 2011

Instructor: Dr. Friendly

Current Score : 0 / 9

Due : Tuesday, August 23, 2011 11:00 PM EDT

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  • Description

    Here are some textbook questions from Astronomy Today 5/e by Chaisson and McMillan published by Addison Wesley. Click here for a list of all of the questions coded in WebAssign.

  • Instructions

    This demo assignment allows many submissions and makes the answer key available after the first submission so you can see the correct answers. (Typically, the answer key is posted after the due date!)

Assignment Submission

For this assignment, the number of submissions for each answer box is counted independently. The number of submissions remaining changes only if you submit a new or changed answer.

1. –/1 points Notes Question: AT5 1.P.08.
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A surveyor wishes to measure the distance between two points on either side of a river, as illustrated in Figure 1.29. She measures the distance AB to be 270 m and the angle at B to be 35°. What is the distance between the two points?
Enter a number.
 m


Figure 1.29


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2. –/3 points Notes Question: AT5 2.P.14.
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Use Newton's law of gravity to calculate the force of gravity between you and Earth. Convert your answer, which will be in Newtons, to pounds using the conversion 4.45 N equals one pound. (Assume that your mass is 73 kg.)
Enter a number.
 N
Enter a number.
 lbs
What do you normally call this force?
Answer is not case sensitive.

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3. –/1 points Notes Question: AT5 2.TB.059.
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If the mass of an object is doubled, its gravitational force is quadrupled.
    

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4. –/2 points Notes Question: AT5 3.RD.20.
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If Earth were completely blanketed with clouds and we couldn't see the sky, could we learn about the realm beyond the clouds?

What forms of radiation might be received?


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5. –/2 points Notes Question: AT5 13.P.08.
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Astronomers on Earth are observing the occultation of a star by Uranus and its rings (see Figure 13.18). It so happens that the event is occurring when Uranus is at opposition, and the center of the planet appears to pass directly across the star. Assuming circular planetary orbits and, for simplicity, taking the rings to be face-on, calculate the following.


Figure 13.18

(a) How long the 90 km wide Epsilon ring takes to cross the line of sight?
Enter a number.
 seconds
(b) The time interval between the passage of the Alpha ring and that of the Epsilon ring. (Hint: The apparent motion of Uranus is due to a combination of both the planet's own motion and Earth's motion in their respective orbits around the Sun.)
Enter a number.
 s

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