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Get Full Access to Physics For Scientists And Engineers: A Strategic Approach, Standard Edition (Chs 1 36) - 4 Edition - Chapter 31 - Problem 31.6
Get Full Access to Physics For Scientists And Engineers: A Strategic Approach, Standard Edition (Chs 1 36) - 4 Edition - Chapter 31 - Problem 31.6

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# The first diagram shows electric and magnetic fields in

ISBN: 9780134081496 191

## Solution for problem 31.6 Chapter 31

Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) | 4th Edition

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Physics for Scientists and Engineers: A Strategic Approach, Standard Edition (Chs 1-36) | 4th Edition

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Problem 31.6

The first diagram shows electric and magnetic fields in reference frame A. Which diagram shows the fields in frame B?

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Chapter 19 Population Ecology ­Studies factors that affect population growth and density Population density­ The number of individuals of a species per unit of area, is measured for humans by birth and death rates in hospitals, estimates also by indirect indicators such as birds nests or rodent burrows Mark­recapture method­ Animals are trapped, marked, then recaptured after a period of time, sees how populations are doing over periods of time Population Growth Models 1. Exponential growth model­ “ The idea of an unlimited environment” describes the rate of expansion of a population under ideal, unregulated conditions. The rate at which a population grows depends of the number of individuals already in the population, j looking graph 2. Logistic growth model­ The reality of an environment, a population will eventually have one or more environmental factors that will limit their growth (population ­limiting factors), describes growth of an idealized population that is slowed by a limiting factor, sideways s looking graph The growth rate­Is the change in population size per time interval Carrying capacity­ Number of individuals in a population that the environment can just maintain without net increase or decrease. Where the logistic curve levels off in the graph is where the carrying capacity is. Population Cycles ● Have regular boom­and­bust cycles Endangered Species ● Ones that are in danger of extinction throughout all or a significant portion of their range Threatened Species ● Ones that are likely to become endangered in the future Human Population Growth ● Been growing exponentially for centuries ● In 2014­205 human population globally is leveling off ● Is based on birth and death rates ● Growth= birth minus death Chapter 20 Communities and Ecosystems Causes of Declining Biodiversity 1. Habitat Destruction­ single greatest threat 2. Invasive Species­ can cause rapid extinction ex) Kudzu Japanese Plant 3. Overexploitation of wildlife Community Ecology ● Species living close enough for potential interactions Interspecific Competition ● May occur when two or more species rely on two or more resources ● Can limit the growth of the competing species Ecological Niche ● The species ecological role ● Total use of biotic and abiotic resources Russian ecologist G.F. Gause ● Studied the effects of interspecific competition in two closely related species of protists ● Gause’s research concluded that two similar species can not coexist within a community if their niche is identical this is also known as “Competitive exclusion principle” Outcomes of competition between species ● Extinction of one species ● Evolution of one species to use different resources Types of Interspecific Competition Mutualism­ both species benefit from an interaction Predation­ when one species kills another­ a win/lose relationship ● Predators­ have adaptations such as claws,teeth, fangs, stingers, poison, being fast/agile in order to catch their prey ● Prey Defenses­ include hiding( passive defense), escaping (active defense), having a hard shell or quills ( mechanical defense) mobbing or having an alarming call ( behavioral defense), or distracting their predator from the vulnerable prey for a prey that can escape ( distraction displays), or camouflage also known as cryptic coloration.

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