Referring once again to Easterbrook's quote (Problem 2- 28), explain why he would assert that the next two generations of growth are inevitable
What will be an ideal response?
The inevitability comes because in growing populations, the numbers of young
females is proportionally greater than in stable populations. A young-weighted population
will produce more children than one with the same proportion of people at each age range.
Thus, population increase is assured by the age structure of the population.
Easterbrook does recognize that events from Nature (or human stupidity leading to nuclear
war) can cause a change in the inevitability of the growth, unlike Simon and like Asimov,
Bartlett, and Kendall (see Questions 2-13, 2-21, and 2-22 above).
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A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m2 and her angular speed increases to 4.0 rev/s
Determine her initial moment of inertia.
Studies of solar vibrations have revealed that
A) the Sun vibrates only on the surface. B) neutrinos from the solar core reach the solar surface easily. C) the Sun generates energy by nuclear fusion. D) they are caused by processes similar to those that create earthquakes. E) our mathematical models of the solar interior are fairly accurate.
When a body moves in circular motion at constant speed
a. the velocity and acceleration point in the same direction. b. the velocity and acceleration point in opposite directions. c. the velocity and acceleration point perpendicular to each other. d. the acceleration is zero. e. none of the above.
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2. What is the magnitude of the electric field at any point not on either surface?
A. 1.1 N/C B. 5.6 N/C C. 7.9 N/C D. 3.8 N/C E. 4.0 N/C