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January 24, 2015

January 24, 2015

Posted by **Tom** on Monday, November 19, 2012 at 10:43am.

(a) the period of this motion (b) the frequency of the motion (c) the amplitude of the motion (d) the first time after t=0 that the object reaches the position x = 2.6 cm (Make sure your calculator is in radians mode)

- Physics HELP! -
**Elena**, Monday, November 19, 2012 at 4:56pm(a)

Compare

x = (7.1 cm) sin (2.1π t)

with

x=Asin(ωt)

Then

ω= 2.1π,

=> T=2π/ ω =

= 2 π/2.1π=0.7 rad/s

(b)

f=1/T=1.42 Hz

(c)

A=7.1 cm

(d)

x=Asin(ωt)

2.6 = 7.1 sin (2.1π t)

sin (2.1π t) =2.6/7.1=0.366

(2.1π t)=sin⁻¹0.366=0.375 rad

t=0.375/2.1π=0.0569 s.

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