Q1: A person weighs 155 lbs and is walking 3.1 miles per hour. How much kinetic energy does the person have? (Keep in mind, 1 kg is 2.2 lb, and 1 m/s is 2.24 mi/h.) I Q2: What is the kinetic energy of a 5 g bullet travelling 400 m/s? Q3: Is it possible to have a negative KE? Why or why not?.
Q1: A person weighs 155 lbs and is walking 3.1 miles per hour. How much kinetic energy does the person have? (Keep in mind, 1 kg is 2.2 lb, and 1 m/s is 2.24 mi/h.) I Q2: What is the kinetic energy of a 5 g bullet travelling 400 m/s? Q3: Is it possible to have a negative KE? Why or why not?.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:Work and Energy
Activity 1
We do not often deal with kinetic energy in everyday life, so we may not have a sense for what a
large or small amount of kinetic energy is. We begin with a couple of calculations to get a sense
for kinetic energy:
Q1: A person weighs 155 lbs and is walking 3.1 miles per hour. How much kinetic energy does
the person have? (Keep in mind, 1 kg is 2.2 lb, and 1 m/s is 2.24 mi/h.)
Q2: What is the kinetic energy of a 5 g bullet travelling 400 m/s?
Q3: Is it possible to have a negative KE? Why or why not?.
Work and KE
Activity 2
An object does not change its KE on its own, e.g., a book at rest doesn't spontaneously start to
move. It requires work to change KE! Work, WF, has a precise definition in physics.
The work done by a constant force "F" through a displacement "d" is:
WF Fdcoso
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