×
Log in to StudySoup
Get Full Access to Precalculus: Graphical, Numerical, Algebraic - 8th edition Edition - Chapter 2.1 - Problem 2.1.1.77
Join StudySoup for FREE
Get Full Access to Precalculus: Graphical, Numerical, Algebraic - 8th edition Edition - Chapter 2.1 - Problem 2.1.1.77

Already have an account? Login here
×
Reset your password

A group of female children were weighed. Their ages and

Precalculus: Graphical, Numerical, Algebraic | 8th Edition | ISBN: 9780321656933 | Authors: Franklin Demana, Bert K. Waits, Gregory D. Foley, Daniel Kennedy, Dave Bock ISBN: 9780321656933 190

Solution for problem 2.1.1.77 Chapter 2.1

Precalculus: Graphical, Numerical, Algebraic | 8th Edition

  • Textbook Solutions
  • 2901 Step-by-step solutions solved by professors and subject experts
  • Get 24/7 help from StudySoup virtual teaching assistants
Precalculus: Graphical, Numerical, Algebraic | 8th Edition | ISBN: 9780321656933 | Authors: Franklin Demana, Bert K. Waits, Gregory D. Foley, Daniel Kennedy, Dave Bock

Precalculus: Graphical, Numerical, Algebraic | 8th Edition

4 5 1 344 Reviews
22
2
Problem 2.1.1.77

A group of female children were weighed. Their ages and weights are recorded in Table 2.8.(a) Draw a scatter plot of the data. (b) Find the linear regression model. (c) Interpret the slope of the linear regression equation. (d) Superimpose the regression line on the scatter plot. (e) Use the regression model to predict the weight of a 30-month-old girl.

Step-by-Step Solution:
Step 1 of 3

PHYS Notes Week 7 Feb 22­26 Electric Charge ­ Particles have either a positive or negative charge ­ Combining these particles into atoms/molecules result in three possibilities ­ Negatively charged: object contains more negative particles than positive particles ­ Positively charged: object contains more positive particles than negative particles ­ Electrically neutral: object contains equal amounts of positive and negative particles ­ Nature prefers neutral charges ­ The terms "positive" and "negative" don't mean anything; they just refer to the fact that the charges are opposite ­ Electrostatic/electric force: the force that charged particles exert on each other ­ Objects with the same electrical charge repel each other, while objects with opposite electrical charges attract each other ­ Strong electrical charges can induce an opposite charge in a neutrally charged system ­ Grounding it can neutralize a system’s charge ­ Grounding: touching an object to the ground (the earth is so big that it can absorb any extra charge without problem) ­ Unit of electric charge is a coulomb (C) ­ Derived from base unit of ampere, which is a measure of current ­ Current: rate at which charge moves past a given point in a given amount of time ­ Charge is quantized (comes in basic units based on electrons that cannot be divided) ­ Basic unit of charge: electron ­ Historically led to the development of quantum mechanics ­ Charge is conserved (cannot be created or destroyed, only moved around) ­ Charge moving through materials ­ Conductors vs. insulators ­ Conductors allow electrons to move freely (ex. metal) ­ Everything can be a conductor with enough electricity ­ Insulators don't allow electrons to move as freely ­ Semi­conductors are somewhere in between ­ Superconductors allow charge to move without hindrance ­ Coulomb’s law ­ Force exerted by charged particles on each other depends on the size of the charge of the particles as well as their distance from one another ­ Two positive or two negative charges ­­> particles push away from each other; one negative and one positive charge ­­> particles attract each other * Increasing force means opposite charges (attracting particles) ­ Electric fields: electrostatic forces existing around a charged particle ­ Determine what a field looks like by placing a test charge near it and measuring the force applied to the test charge ­ We draw electric field using field lines ­ Field lines closer together shows stronger force ­ Field lines extend away from positive charges and toward negative charges ­ If we create a field, we can direct a particle through it (old TVs) ­ Charged particles have potential energy ­ Electric potential (voltage): potential energy per electrical charge ­ Electric current: flow of electrons in motion (negative to positive) ­ Produced by voltage ­ Inserting battery into loop of conductive material creates a flow ­ Conduction ­ Some materials conduct electricity better due to resistance of the material ­ Resistance inhibits flow ­ Ohm: unit of resistance ­ Ohm's law: as potential increases, current increases, and when resistance increases, current decreases ­ Series Circuits ­ Battery/power supply: creates a difference in potential energy ­ Path from one end of battery to another (wire or other conductive material) ­­> electrical current ­ Electrons pushed through a resistor, which slows the current down/steals kinetic energy from the electrons to power a machine ­ Power multiple machines by adding multiple resistors to circuit around the circuit ­ Each resistor increases the overall resistance of circuit ­ Parallel circuits ­ Put resistors into a circuit next to each other, creating multiple paths for the electron to move through ­ If one of the paths slows down (because electrons have to slow to enter the resistor), the backed­up electrons move through the next parallel resistor ­ Adding resistors decreases the resistance of the circuit, increasing current flow (like adding lanes to a highway) ­ Too fast of a current is an issue because wires can only hold so much electricity ­ Direct current (DC): current that flows in only one direction ­ Usually used in electronics/devices ­ Alternating current (AC): current alternates direction (60 times/s (60 Hz)), which changes, faster than what we can see (20 Hz) ­ Easier to generate and travel over long distances ­ Argument between Tesla (AC) vs. Edison (DC) because AC is dangerous ­ Edison created the electric chair, which used AC ­ Transformers are used to change between AC and DC

Step 2 of 3

Chapter 2.1, Problem 2.1.1.77 is Solved
Step 3 of 3

Textbook: Precalculus: Graphical, Numerical, Algebraic
Edition: 8th Edition
Author: Franklin Demana, Bert K. Waits, Gregory D. Foley, Daniel Kennedy, Dave Bock
ISBN: 9780321656933

Other solutions

People also purchased

Related chapters

Unlock Textbook Solution

Enter your email below to unlock your verified solution to:

A group of female children were weighed. Their ages and