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svet-max [94.6K]
3 years ago
5

A block of mass 0.75 kg is suspended from a spring having a stiffness of 150 N/m. The block is displaced downwards from its equi

librium position through a distance of 3 cm with an upward velocity of 2 cm/sec. Determine: a)- The natural frequency b)-The period of oscillation c)-The maximum velocity d)-The phase angle e)-The maximum acceleration
Engineering
2 answers:
Fantom [35]3 years ago
6 0

Answer:

A. 2.249 hz

B. 0.45 s

C. 0.424 m/s

D. 66⁰

E. 6 m/s^2

Explanation:

<u>Step 1:</u> identify the given parameters

mass of the block (m)= 0.75kg

stiffness constant (k) = 150N/m

Amplitude (A) = 3cm = 0.03m

upward velocity (v) = 2cm/s

<u>Step 2:</u> calculate the natural frequency (F)by applying relevant formula in S.H.M

f=\frac{1}{2\pi } \sqrt \frac{k}{m}

f=\frac{1}{2\pi } \sqrt \frac{150}{0.75}

f = 2.249 hz

<u>Step 3:</u> calculate the period of the oscillation (T)

period (T) = \frac{1}{frequency}

T = \frac{1}{2.249} (s)

T = 0.45 s

<u>Step 4</u>: calculate the maximum velocity,V_{max}

V_{max} = A\sqrt{\frac{k}{m} }

A is the amplitude of the oscilation

V_{max} = 0.03\sqrt{\frac{150}{0.75} }

V_{max} = 0.424(\frac{m}{s})

<u>Step 5:</u> calculate the phase angle, by applying equation in S.H.M

X = Acos(\omega{t} +\phi)

where X is the displacement; calculated below

Displacement = upward velocity X period of oscillation

displacement (X) = vt (cm)

X = (2cm/s) X (0.45 s)

X = 0.9 cm = 0.009m

where \omega is omega; calculated below

\omega=\sqrt{\frac{k}{m} }

\omega=\sqrt{\frac{150}{0.75} }

\omega= 14.142

\phi = phase angle

Applying displacement equation in S.H.M

X = Acos(\omega{t}+\phi)

0.009 = 0.03cos(14.142 X 0.45+\phi)

cos(6.364+\phi) = \frac{0.009}{0.03}

cos(6.364+\phi) = 0.3

(6.364+\phi) = cos^{-1}(0.3)

(6.364+\phi)= 72.5⁰

6.364+\phi =72.5⁰

\phi =72.5 -6.364

\phi =66.1⁰

Phase angle, \phi ≅66⁰

<u>Step 6:</u> calculate the maximum acceleration, a_{max}

a_{max} = \omega^{2}A

a_{max} = 14.142 X 14.142 X 0.03

a_{max} = 5.999 (\frac{m}{s^{2} })

a_{max} ≅ 6 (\frac{m}{s^{2} })

olganol [36]3 years ago
3 0

Answer:

a)f=2.25 Hz

b)Time period T=.144 s

c)tex]V_{max}[/tex]=0.42 m/s

d)Phase angle Ф=87.3°

e) a_{max}=6.0041 [tex]\frac{m}{s^2}

Explanation:

a)

Natural frequency

  \omega _n=\sqrt {\dfrac{K}{m}}

\omega _n=\sqrt {\dfrac{150}{0.75}}

\omega _n=14.14 rad/s

w=2πf

⇒f=2.25 Hz

b) Time period

=\dfrac{2π}{\omega _n}

T=\frac{1}{f}

 Time period T=.144 s

c)Displacement equation

x=Acos\omega _nt+Bsin\omega _nt

Boundary condition

t=o,x=0.03 m

t=0,v=.02m/s   , V=\frac{dx}{dt}

Now by using these above conditions

A=0.03,B=0.0014

x=0.03 cos14.14 t+0.0014 sin14.14 t

⇒x=0.03003sin(14.14t+87.3)

V_{max}=\omega_n X_{max}

V_{max}=14.14\times 0.03003=0.42 m/s

d)

Phase angle Ф=87.3°

e)

Maximum acceleration

a_{max}=(\omega _n )^2X_{max}

a_{max}=(14.14)^20.03003=6.0041 \frac{m}{s^2}

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