Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 22, Problem 7E
On which edge of the main sequence band on an H−R diagram would the zero-age main sequence be?
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Students have asked these similar questions
1. At 0°C a steel cable is 1km long and 1cm diameter when it is heated it expands and its resistivity
increases. Calculate the change in resistance of the cable as it is heated from 0-20°C
The temperature coefficient of resistance a, gives the fractional increase in resistance per °C.
So increase in resistance AR = Ra.AT
Where R, is the resistance at 0°C
For steel a, 0.003 °C
The coefficient of linear expansion a- gives the fractional increase in length per °C temperature
rise.
So increase in Length AL La-AT
Where L, is the length at 0°C
For steel a₁ = 12 x 10 °C-1
The resistivity of steel at 0°C = 1.2 x 10 Qm
1.
F
E
6V
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B
a
6V
b
C
C
Apply Kirchoff's 1st law to point C for the circuit above
Apply Kirchoff's 2nd Law to loops:
a.
ABCFA
b.
ABDEA
C.
FCDEF
d. Find values for currents a,b and c
D
2. The results of the Rutherford experiment can be categorized in 3 statements. Fill in the
missing words
Most
11.
Some
III.
A few
State which result gives evidence that the nucleus is
a. heavier than an alpha particle
b. very small compared to the size of the atom
c. positively charged
3. Using values in the diagram derive an expression for r
.0
e
m
Chapter 22 Solutions
Astronomy
Ch. 22 - Compare the following stages in the lives of a...Ch. 22 - What is the first event that happens to a star...Ch. 22 - Astronomers find that 90% of the stars observed in...Ch. 22 - Describe the evolution of a star with a mass...Ch. 22 - Describe the evolution of a star with a mass...Ch. 22 - A star is often described as “moving” on an HR...Ch. 22 - On which edge of the main sequence band on an HR...Ch. 22 - How do stars typically “move” through the main...Ch. 22 - Certain stars, like Betelgeuse, have a lower...Ch. 22 - Gravity always tries to collapse the mass of a...
Ch. 22 - Why are star clusters so useful for astronomers...Ch. 22 - Would the Sun more likely have been a member of a...Ch. 22 - Suppose you were handed two HR diagrams for two...Ch. 22 - Referring to the HR diagrams in Exercise 22.13,...Ch. 22 - The nuclear process for fusing helium into carbon...Ch. 22 - Pictures of various planetary nebulae show a...Ch. 22 - Describe the two “recycling” mechanisms that are...Ch. 22 - In which of these star groups would you mostly...Ch. 22 - Explain how an HR diagram of the stars in a...Ch. 22 - Where did the carbon atoms in the trunk of a tree...Ch. 22 - What is a planetary nebula? Will we have one...Ch. 22 - Is the Sun on the zero-age main sequence? Explain...Ch. 22 - How are planetary nebulae comparable to a...Ch. 22 - Which of the planets in our solar system have...Ch. 22 - Would you expect to find an earthlike planet (with...Ch. 22 - In the HR diagrams for some young clusters, stars...Ch. 22 - If the Sun were a member of the cluster NGC 2264,...Ch. 22 - If all the stars in a cluster have nearly the same...Ch. 22 - Suppose a star cluster were at such a large...Ch. 22 - Suppose an astronomer known for joking around told...Ch. 22 - Stars that have masses approximately 0.8 times the...Ch. 22 - Automobiles are often used as an analogy to help...Ch. 22 - The text says a star does not change its mass very...Ch. 22 - The text explains that massive stars have shorter...Ch. 22 - You can use the equation in Exercise 22.34 to...Ch. 22 - You can estimate the age of the planetary nebula...Ch. 22 - If star A has a core temperature T, and star B has...
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