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The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s = 2 sin πt + 4 cos πt, where t is measured in seconds. (Round your answers to two decimal places.)

(a) Find the average velocity during each time period.

i. [1,2]

ii. [1,1.1]

iii. [1.1.01]

iv. [1.1.001]

(b) Find the instaneous velocity of the particle when t=1

Guest Mar 5, 2015

Best Answer 

 #1
avatar+92254 
+5

 

The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s = 2 sin πt + 4 cos πt, where t is measured in seconds. (Round your answers to two decimal places.)

(a) Find the average velocity during each time period.

i. [1,2]

$$\\s(1)=2sin(\pi *1)+4cos(\pi *1)\\
s(1)=2sin(\pi)+4cos(\pi)\\
s(1)=0+4*-1\\
s(1)=-4\\\\
\\s(2)=2sin(\pi *2)+4cos(\pi *2)\\
s(2)=2sin(2\pi)+4cos(2\pi)\\
s(2)=0+4*+1\\
s(2)=4\\\\
Average\; velocity=\frac{distance}{time}\\
Average\; velocity=\frac{4--4}{2-1}\\
Average\; velocity=\frac{8}{1}\\
Average\; velocity=8 \;cm/sec$$

ii. [1,1.1]

iii. [1.1.01]

iv. [1.1.001]

 

(b) Find the instaneous velocity of the particle when t=1

 

$$\\s=2sin(\pi t)+4cos(\pi t)\\
v(t)=\frac{ds}{dt}=2\pi cos(\pi t)+-4\pi sin(\pi t)\\
v(t)=\frac{ds}{dt}=2\pi cos(\pi t)-4\pi sin(\pi t)\\
v(1)=2\pi cos(\pi*1 )-4\pi sin(\pi *1)\\
v(1)=2\pi *-1 \quad -4\pi *0\\
v(1)=-2\pi \;\;cm/sec\\$$

Melody  Mar 6, 2015
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1+0 Answers

 #1
avatar+92254 
+5
Best Answer

 

The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s = 2 sin πt + 4 cos πt, where t is measured in seconds. (Round your answers to two decimal places.)

(a) Find the average velocity during each time period.

i. [1,2]

$$\\s(1)=2sin(\pi *1)+4cos(\pi *1)\\
s(1)=2sin(\pi)+4cos(\pi)\\
s(1)=0+4*-1\\
s(1)=-4\\\\
\\s(2)=2sin(\pi *2)+4cos(\pi *2)\\
s(2)=2sin(2\pi)+4cos(2\pi)\\
s(2)=0+4*+1\\
s(2)=4\\\\
Average\; velocity=\frac{distance}{time}\\
Average\; velocity=\frac{4--4}{2-1}\\
Average\; velocity=\frac{8}{1}\\
Average\; velocity=8 \;cm/sec$$

ii. [1,1.1]

iii. [1.1.01]

iv. [1.1.001]

 

(b) Find the instaneous velocity of the particle when t=1

 

$$\\s=2sin(\pi t)+4cos(\pi t)\\
v(t)=\frac{ds}{dt}=2\pi cos(\pi t)+-4\pi sin(\pi t)\\
v(t)=\frac{ds}{dt}=2\pi cos(\pi t)-4\pi sin(\pi t)\\
v(1)=2\pi cos(\pi*1 )-4\pi sin(\pi *1)\\
v(1)=2\pi *-1 \quad -4\pi *0\\
v(1)=-2\pi \;\;cm/sec\\$$

Melody  Mar 6, 2015

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