Beam Strength A wooden beam has a rectangular crosssection of height h and width w (see figure). The strength S ofthe beam is directly proportional to the width and the squareof the height. What are the dimensions of the strongest beamthat can be cut from a round log of diameter 20 inches? (Hint:S = kh?w, where k is the proportionality constant.)

Answered: Image /qna-images/answer/5e6a2789-e4ec-4c9f-bd19-5ceea9b828f8.jpg

Answered: Beam Strength A wooden beam has a…

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter4: Polynomial And Rational Functions

Section4.6: Variation

Problem 12E

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Hookes Law Hookes Law states that the force needed to keep a spring stretched x units beyond its natural length is directly proportional to x. Here the constant of proportionality is called the spring constant. a Write Hookes Law as an equation. b If a spring has a natural length of 5 cm and a force of 30 N is required to maintain the spring stretched to a length of 9 cm, find the spring constant. c What force is needed to keep the spring stretched to a length of 11 cm?
Keplers Third Law Keplers Third Law of planetary motion states that the square of the period T of a planet the time it takes for the planet to make a complete revolution about the sun is directly proportional to the cube of its average distance d from the sun. a Express Keplers Third Law as an equation. b Find the constant of proportionality by using the fact that for our planet the period is about 365 days and the average distance is about 93 million miles. c The planet Neptune is about 2.79109 mi from the sun. Find the period of Neptune.
Kepler’s Third Law Kepler’s Third Law of planetary motion states that the square of the period T of a planet (the time it takes fur the planet to make a complete resolution about the sun) is directly proportional to the cube of its average distance d from the sun. (a) Express Kepler’s Third Law as an equation. (b) Find the constant of proportionality by using the Fact that for our planet the period is about 365 days and the average distance is about 93 million miles (c) The planet Neptune is about 2.79109 mi from the sun. Find the period of Neptune.
Hubbles Constant Astronomers believe that the universe is expanding and that stellar objects are moving away from us at a radial velocity V proportional to the distance D from Earth to the object. a. Write V as a function of D using H as the constant of proportionality. b. The equation in part a was first discovered by Edwin Hubble in 1929 and is known as Hubbles law. The constant of proportionality H is known as Hubbles constant. The currently accepted value of Hubbles constant is 70 kilometers per second per megaparsec. One megaparsec is about 3.0861019 kilometers. With these units for H, the distance D is measured in megaparsecs, and the velocity V is measured in kilometers per second. The galaxy G2237+305 is about 122.7 megaparsecs from Earth. How fast is G2237+305 receding from Earth? c. One important feature of Hubbles constant is that scientists use it to estimate the age of the universe. The approximate relation is y=1012H Where y is time in years. Hubbles constant is extremely difficult to measure, and Edwin Hubbles best estimate in 1929 was about 530 kilometers per second per megaparsec. What is the approximate age of the universe when this value of H is used? d. The calculation in part c would give scientists some concern, since Earth is thought to be about 4.6 billion years old. What estimate of the age of the universe does the more modern value of 70 kilometers per second per megaparsec give?

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