Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 25, Problem 2SOP
To determine
The length of the line that is used to represent the history of human civilization.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
According to modern science, Earth is about 4.5 billion years old and written human history extends back about 10,000 years. Suppose the entire history of Earth is
represented with a 100-meter-long timeline, with the birth of Earth on one end and today at the other end.
a. What distance represents 1 billion years?
b. How far from the end of the timeline does written human history begin?
a. 1 billion years is represented by meters of the timeline.
(Type an integer or decimal rounded to the nearest tenth as needed.)
millimeters from the end of the timeline.
b. Written human history begins about
(Type an integer or decimal rounded to the nearest hundredth as needed.)
An isotope of a radioactive element has half-life equal to 9 thousand years.
Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 25 percent of the initial quantity of the isotope remaining.
How old is the sample?
Give your answer in thousands of years, correct to one decimal place.
Write the scientific notation (10n)
0012 =
560000 =
Write out the number
3 x 104 =
8 x 10-2 =
How many centimeters are in 2 kilometers? Write your answer in scientific notation.
How long would it take in minutes to travel 5km if you are traveling at a speed of 30 m/s?
A ship left shore 3 days ago and has been moving at a constant speed. The cruise ship is now 1440 miles away. What is the average speed in mph?
5a. A tuning fork has a period of 4s. What is the frequency?
5b. If the tuning fork above is struck in air, what is the wavelength?
5c. If the tuning fork above is struck in water, what is the wavelength?
The wave below is traveling at 5 m/s.
6a. What are the wave y(x) and oscillator y(t) sinusoid equations for this wave?
What is a sound wave?
Identify where the compressions and the rarefactions are in both graphs.…
Chapter 25 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 25 - Explain how astrobiology is a science and not a...Ch. 25 - Describe one special quality of water that makes...Ch. 25 - Mars and Europa are two Solar System bodies that...Ch. 25 - How does the DNA molecule produce a copy of...Ch. 25 - What would happen to a life-form if the genetic...Ch. 25 - What would happen to a life-form if the genetic...Ch. 25 - What would happen to a life-form if the...Ch. 25 - Describe an example of natural selection acting on...Ch. 25 - Prob. 9RQCh. 25 - What evidence do scientists have that life on...
Ch. 25 - Define organic, as in organic molecule. How is...Ch. 25 - Why is liquid water generally considered necessary...Ch. 25 - Some meteorites contain organic molecules. What...Ch. 25 - What is the difference between chemical evolution...Ch. 25 - Prob. 15RQCh. 25 - Why was Earths early atmosphere able to support...Ch. 25 - Molecules of which gas were needed in Earths...Ch. 25 - Does intelligence make a creature more likely to...Ch. 25 - Describe one hypothesis for how cells first...Ch. 25 - What is the evidence that the first organisms on...Ch. 25 - Name three locations in our Solar System to search...Ch. 25 - Why are upper-main-sequence (high-luminosity) host...Ch. 25 - Prob. 23RQCh. 25 - How does the stability of technological...Ch. 25 - Prob. 25RQCh. 25 - Prob. 26RQCh. 25 - Why are scientists confident Earth has never been...Ch. 25 - Why does the Drake equation implicitly assume the...Ch. 25 - A single human cell encloses about 1.5 m of DNA....Ch. 25 - If you represent Earths history by a line that is...Ch. 25 - Consider Figure 25-8. What is the ratio of the...Ch. 25 - Suppose a human generation is defined as the...Ch. 25 - If a star must remain on the main sequence for at...Ch. 25 - Prob. 6PCh. 25 - If you detected radio signals with an average...Ch. 25 - Prob. 8PCh. 25 - The first radio broadcast was made on January 13,...Ch. 25 - Prob. 10PCh. 25 - The DNA in a single cell in your body contains...Ch. 25 - Prob. 2SOPCh. 25 - Look at Figure 25-11. Since the time we sent the...Ch. 25 - The star cluster shown in this image contains a...Ch. 25 - If you could search for life in the galaxy shown...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- If you represent Earths history by a line that is 1 m long, how long a segment would represent the 400 million years since life first moved onto the land? How long a segment would represent the 4-millionyear history of humanoid life?arrow_forwardAn isotope of a radioactive element has half-life equal to 5 thousand years. Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 20 percent of the initial quantity of the isotope remaining. How old is the sample? Give your answer in thousands of years, correct to one decimal place. Age : ___ thousand years.arrow_forward1 million kilometers can be expressed in scientific notation as: 10x10^6 km 10x10^-6 km none of these 1x10^6 km 1x10^-6kmarrow_forward
- Radioactive isotopes can be used to find the age of rocks, fossils, or other artifacts. Carbon-14 has a half-life of 5,730 years. Suppose a sample of charcoal from a primitive fire pit contains one eighth of its original amount of carbon-14. How old is the sample? (Give your answer in units of years)arrow_forwardTropical rainforests covers 2% of the earth’s land surface. If there are 197,000,000square meter of land surface on earth. How many square kilometers of rainforest are there?arrow_forwardThe isotope carbon-14 decays over time into nitrogen-14 with a half life of 5,730 years. Suppose you find a fossil that contains 1.25 grams of carbon-14 and 3.75 grams of nitrogen 14. How much carbon-14 was present in the organism at the time of death?arrow_forward
- Suppose a sample of a certain substance decayed to 69.8% of its original amount after 300 days. (Round your answers to two decimal places.) (a) What is the half-life (in days) of this substance? days (b) How long would it take the sample to decay to one-third of its original amount? daysarrow_forwardMap scales may be presented as a ratio, or as a bar on which distances are measured. A ratio of 1:50,000 means that every inch on the map represents 50,000 inches on the ground. If a has a scale where 1 inch represents 1 mile, what would be the scale expressed as a map ratio? (Hint: you need to calculate how many inches are in a mile) 1: On the bar below, how many miles are represented by 1 inch? miles What is this scale expressed as a ratio? 1: What is the value of point 'X'? 10 X 20 Scale (miles)arrow_forwardA radio broadcast left Earth in 1911. How far in light years has it traveled? If there is, on average, 1 star system per 400 cubic light years, how many star systems has this broadcast reached? Assume that the fraction of these star systems that have planets is 0.50 and that, in a given planetary system, the average number of planets that have orbited in the habitable zone for 4 billion years is 0.20. How many possible planets with life could have heard this signal?arrow_forward
- A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material. The half-life of isotope X is 10,000 years. How old is the rock sample? (Give your answer without any punctuation or lables. For example: 15000).arrow_forwardA certain radioactive material has a half-life of 8 minutes. Suppose you have a large sample of this material , containing 10^25 atoms. 5x10^24 atoms decay in the first 8 minutes and 2.5x10^24 atoms decay in the second 8 minutes. What is the ratio of the number of atoms that decay in the first 8 minutes to the number of atoms that decay in the second 8 minutes A 5/1 B 2/1 C 1/5 D 1/2arrow_forwardUse the equation E = mc^2 where E is energy in Joules (J), m is mass in kilograms (kg) and c is the speed of light 3 x 10^8 m/s to answer the following: a) One ton of TNT releases 4.18 gigajoules of energy. The metric prefix giga means billion. a) How much mass would be required to release an equivalent amount of energy? b) How much energy (J) is equivalent to 1 kilogram of mass?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Stars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage LearningFoundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning
- An Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning
Stars and Galaxies (MindTap Course List)
Physics
ISBN:9781337399944
Author:Michael A. Seeds
Publisher:Cengage Learning
Foundations of Astronomy (MindTap Course List)
Physics
ISBN:9781337399920
Author:Michael A. Seeds, Dana Backman
Publisher:Cengage Learning
An Introduction to Physical Science
Physics
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:Cengage Learning