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$\cdot$ The once-popular LP (long-play) records were 12 in. in diameter and turned at a constant 33$\frac{1}{3}$ rpm. Find (a) the angular speed of the LP in rad/s and (b) its period in seconds.

a) 3.5 $\mathrm{rad} / \mathrm{s}$$[1.8 \mathrm{s}]$

Physics 101 Mechanics

Chapter 9

Rotational Motion

Physics Basics

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Hope College

University of Sheffield

University of Winnipeg

McMaster University

Lectures

04:16

In mathematics, a proof is…

02:21

In physics, rotational dyn…

02:13

A vinyl record on a turnta…

04:56

A turntable reaches an ang…

01:11

A phonograph record has an…

01:49

An old-fashioned single-pl…

02:18

$\cdot$ A turntable that s…

02:01

A phonograph turntable rot…

02:08

SSM A record turntable rot…

00:57

$\cdot$ If a wheel 212 $\m…

01:29

An old-style LP record pla…

03:32

A wheel, starting from res…

02:41

Angular Speed A DVD is app…

03:35

A compact disc's rota…

02:22

$\because$ A compact disk,…

02:49

Grace is playing with her …

04:47

An electric turntable $0.7…

03:28

A shaft is turning at 65.0…

05:36

A merry-go-round starts fr…

00:45

A turntable rotates with a…

02:02

LINEAR AND ANGULAR SPEEDS …

04:42

You start an old record pl…

it turns out they are to us angular velocity. They just give it to us and units that they do not want. In the end, they tell us that it's rotating at 33.333 repeating rotation's or revolutions per minute. This is an annual glossy, but we need to convert into ratings for second to do this week and everybody we multiplied by two commercial factors. The first converts for a minutes two seconds. So one minute it's 60 seconds and then the next converts from rotations to radiance. So one rotation is two pi radiance. Where we do this out, you get three point for nine radiance per second, and that's being real policy in unison. Want and Part B. We need to figure out the period of this motion to this. We can use the formula that the velocity is to pie over the period, multiplying both sides by the period and then dividing both sides by the anger. Velocity gives us this formula, and now it complaining the Omega we found in party to figure out what the period is doing. That gives us a value of 1.8 seconds. So it takes 1.8 seconds for this to make a full revolution and

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