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AP Physics 1 Videos 86 videos

AP Physics 1: 2.5 Changes and Conservation Law
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AP Physics 1: 2.5 Changes and Conservation Law. At what point(s) in this situation is energy lost in any form?

AP Physics 1: 1.4 Waves
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AP Physics 1: 1.4 Waves. Which of the following is technically true for Max as he stands at the edge of oblivion? 

AP Physics 1: 1.4 Changes and Conservation Laws
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AP Physics 1: 1.4 Changes and Conservation Laws. Find the current across R2.

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AP Physics 1: 1.1 System Interactions and Changes 196 Views


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Description:

We wouldn't give away the answer to this AP Physics question, not for all the joules in the crown. Come back when you've got some actual jewels. Then we'll talk. 

Language:
English Language

Transcript

00:00

Thank you We sneak and here's your shmoop du jour

00:05

Brought to you by jules as in units of work

00:08

not as in diamonds and rubies No i checked the

00:10

falling diagram This thing here all right A two kilogram

00:13

boxes lifted to a height of ten meters through the

00:16

path indicated by the arrow What is the total work

00:20

done on the box and hear the potential answers money

00:23

jewels Well before we get started it's important to recognize

00:27

that we're dealing in physics math here not in real

00:29

world situations In math terms If we carry a piano

00:32

up two flights of stairs and then back down again

00:35

no work has been done on the piano After all

00:37

it hasn't had any net movement and the force has

00:40

been applied to it has been negated We'll work mathematically

00:45

speaking equals force times Displacement and displacement which is represented

00:50

by x means a total change in position of an

00:54

object Well in our question we think in terms of

00:57

direction the boxes moved four meters to the west Five

01:01

meters to the north four meters to the east and

01:05

another five meters north The four meters east and west

01:09

Cancel each other out there's No displacement there because in

01:12

terms of lateral movement we end up where we started

01:16

so our total displacement is ten meters Now to determine

01:20

the force use we use our trusty equation force equals

01:23

mass times acceleration because the box is being moved up

01:27

The acceleration comes from gravity which is about ten meters

01:30

per second squared and since we know the mass of

01:33

the boxes two kilograms we can calculate the force Let's

01:37

go ahead and plug our numbers into the work equation

01:40

Here Work equals twenty newton's times ten meters for a

01:43

total of two hundred jewels So option b is the

01:46

correct answer Remember no matter how hard we work while

01:49

studying in physics terms There's No work being done if 00:01:52.85 --> [endTime] we just stay at our desk

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