Life in the Universe (4th Edition)
4th Edition
ISBN: 9780134089089
Author: Jeffrey O. Bennett, Seth Shostak
Publisher: PEARSON
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Chapter 7, Problem 2RQ
How does the strength of sunlight vary with distance from the Sun? Discuss the implications for photosynthetic life.
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Small birds like that in (Figure 1) can migrate over long distances without feeding,
storing energy mostly as fat rather than carbohydrate. Fat is a good form of
energy storage because it provides the most energy per unit mass: 1.00 grams of
fat provides about 9.40 (food) Calories, compared to 4.20 (food) Calories per 1.00
grams of carbohydrate. Remember that Calories associated with food, which are
always capitalized, are not exactly the same as calories used in physics or
chemistry, even though they have the same name. More specifically, one food
Calorie is equal to 1000 calories of mechanical work or 4184 joules. Therefore, in
this problem use the conversion factor 1 Cal = 4184 J.
Figure
1 of 1
Part A
Consider a bird that flies at an average speed of 10.7 m/s and releases energy from its body fat reserves at an average rate of 3.70 W (this rate represents the power consumption of the bird).
Assume that the bird consumes 4.00 g of fat to fly over a distance do without stopping for…
Small birds like that in (Figure 1) can migrate over long distances without
feeding, storing energy mostly as fat rather than carbohydrate. Fat is a good
form of energy storage because it provides the most energy per unit mass:
1.00 grams of fat provides about 9.40 (food) Calories, compared to 4.20 (food)
Calories per 1.00 grams of carbohydrate. Remember that Calories associated
with food, which are always capitalized, are not exactly the same as calories
used in physics or chemistry, even though they have the same name. More
specifically, one food Calorie is equal to 1000 calories of mechanical work or
4184 joules. Therefore, in this problem use the conversion factor
1 Cal 4184 J.
Figure
1 of 1
▸ View Available Hint(s)
db = 455 km
Submit Previous Answers
▾ Part B
▶
How many grams of carbohydrate mcarbwould the bird have to consume to travel the same distance db?
Express your answer in grams
View Available Hint(s)
Correct
mcarb 8.95 g
Submit
Part C
Previous Answers
Correct
This is more…
Small birds like that in (Figure 1) can migrate over long
distances without feeding, storing energy mostly as fat
rather than carbohydrate. Fat is a good form of energy
storage because it provides the most energy per unit
mass: 1.00 grams of fat provides about 9.40 (food)
Calories, compared to 4.20 (food) Calories per 1.00
grams of carbohydrate. Remember that Calories
associated with food, which are always capitalized, are
not exactly the same as calories used in physics or
chemistry, even though they have the same name. More
specifically, one food Calorie is equal to 1000 calories of
mechanical work or 4184 joules. Therefore, in this
problem use the conversion factor 1 Cal = 4184 J.
Figure
1 of 1
>
Review | Constants
Consider a bird that flies at an average speed of 10.7 m/s and releases energy from its body fat reserves at an
average rate of 3.70 W (this rate represents the power consumption of the bird). Assume that the bird consumes
4.00 g of fat to fly over a distance do without…
Chapter 7 Solutions
Life in the Universe (4th Edition)
Ch. 7 - Why do we expect the elements of life to be widely...Ch. 7 - How does the strength of sunlight vary with...Ch. 7 - Under what conditions does it seem reasonable to...Ch. 7 - Why is a liquid medium important for life? Why...Ch. 7 - Summarize the three major environmental...Ch. 7 - Why do the Moon and Mercury seem unlikely to be...Ch. 7 - Why is Venus so much hotter than Earth? How does...Ch. 7 - Why does Mars seem such a good candidate for life?Ch. 7 - Briefly discuss the possibility of life on Jupiter...Ch. 7 - With regard to habitability, how do the cases of...
Ch. 7 - What characteristics make some of the large moons...Ch. 7 - Briefly describe the prospects for habitability of...Ch. 7 - Describe and distinguish between space missions...Ch. 7 - For a few of the most important past, present, or...Ch. 7 - On the smallest moon of Uranus, my team discovered...Ch. 7 - New spacecraft images show lakes of liquid water...Ch. 7 - We are pumping water for our new Moon colony from...Ch. 7 - I was part of the first group of people to land on...Ch. 7 - We sent a robotic airplane into the atmosphere of...Ch. 7 - On a moon of Neptune, we discovered photosynthetic...Ch. 7 - We deposited bacteria (from Earth) that get energy...Ch. 7 - The drilled sample showed no signs of life on...Ch. 7 - We cut holes in the frozen surface of a methane...Ch. 7 - The drilled sample from Mars brought up rock that...Ch. 7 - Oxygen and carbon are (a) rarer than almost all...Ch. 7 - On an asteroid that is twice as far as Earth from...Ch. 7 - Compared to liquid water, liquid methane is (a)...Ch. 7 - Frozen lakes often have liquid water beneath their...Ch. 7 - Temperatures on Mercury are (a) always very hot;...Ch. 7 - On Venus, liquid water (a) does not exist...Ch. 7 - The reason Venus is so much hotter than Earth is...Ch. 7 - Life is probably not possible in Jupiters...Ch. 7 - Which of the following are you most likely to find...Ch. 7 - The Cassini spacecraft (a) flew past Pluto; (b)...Ch. 7 - Bizarre Forms of Life. Discuss some forms of life...Ch. 7 - Making a Living. Consider various methods by which...Ch. 7 - Solar System Tour. Based on the brief tour in this...Ch. 7 - Galileo Spacecraft. In 2003, scientists...Ch. 7 - Greenhouse Effect. The text (in Chapter 4) makes...Ch. 7 - Prob. 41IFCh. 7 - Understanding Newtons Version of Keplers Third Law...Ch. 7 - Understanding Newtons Version of Keplers Third Law...Ch. 7 - Earth Mass. The Moon orbits Earth in an average...Ch. 7 - Jupiter Mass. Jupiters moon Io orbits Jupiter...Ch. 7 - Pluto/Charon Mass. Plutos moon Charon orbits Pluto...Ch. 7 - Mission to Pluto. The New Horizons spacecraft took...Ch. 7 - Planetary Missions. Visit the web page for one of...
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