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Schneider and Arny - Pathways to Astronomy 1/e (Homework)

Chris Read

McGraw-Hill, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score : 0 / 9

Due : Tuesday, November 9, 2010 07:00 AM EST

About this Assignment

Question

Points

1	2	3	4	5
0/1	0/1	0/1	0/2	0/4

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0/9

Description

Here are some textbook questions from Pathways to Astronomy by Stephen Schneider and Thomas Arny published by McGraw-Hill. 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!)

1. –/1 points Notes Question: SAstro1 11.TY.03.

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0/1

Occam's razor is used to do which of the following?

measure the angle between the Sun and planets explain why planets change the direction of their orbits describe the path that the planets follow across the ecliptic execute heretics discriminate between models based on their simplicity

2. –/1 points Notes Question: SAstro1 15.TY.02.

Question part

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Which of the following cases does not describe an acceleration?

a car changing its speed from 100 kph to 90 kph a car falling off a cliff a race car driving at 200 kph on a straight highway a car rounding a curve at a steady 50 kph

3. –/1 points Notes Question: SAstro1 18.P.03.

Question part

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0/1

What is the escape velocity from a galaxy at a radius of 45,000 ly if the mass of the galaxy is 10¹²?
m/s

4. –/2 points Notes Question: SAstro1 46.P.01.

Question part

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0/2

Thebe, Io, and Europa orbit at distances of 221,900, 421,000, and 671,000 km from Jupiter's center. Calculate how many times longer Io and Europa take to orbit Jupiter than Thebe. (Hint: You do not need to know Jupiter's mass to calculate the relative times.)
Io
times
Europa
times

5. –/4 points Notes Question: SAstro1 79.P.03.

Question part

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0/1	0/1	0/1	0/1
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What wavelength would visible light (400-700 nm) have if it were seen from a galaxy formed just 5.9 billion years after the Big Bang? (Refer to Table 79.1)
nm to nm
What if it came from matter when the universe was just 1.2 billion years old?
nm to nm

Table 79.1

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