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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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The wall of drying oven is constructed by sandwiching insulation material of thermal conductivity k = 0.05 W/m°K between thin me
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Answer:

86 mm

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\frac {T_ \infty, i-T_{i}}{ R^{"}_{cv, i}} + \frac {T_{o}-T_{i}}{ R^{"}_{cd}} + q_{rad} = 0 Equation 1

Similarly, the equation for outer node “o” will be

\frac {T_{ i}-T_{o}}{ R^{"}_{cd}} + \frac {T_{\infty, o} -T_{o}}{ R^{"}_{cv, o}} = 0 Equation 2

The conventive thermal resistance in i-node will be

R^{"}_{cv, i}= \frac {1}{h_{i}}= \frac {1}{30}= 0.033 m^{2}K/w Equation 3

The conventive hermal resistance per unit area is

R^{"}_{cv, o}= \frac {1}{h_{o}}= \frac {1}{10}= 0.100 m^{2}K/w Equation 4

The conductive thermal resistance per unit area is

R^{"}_{cd}= \frac {L}{K}= \frac {L}{0.05} m^{2}K/w Equation 5

Since q_{rad}  is given as 100, T_{o}  is 40 T_ \infty  is 300 T_{\infty, o}  is 25  

Substituting the values in equations 3,4 and 5 into equations 1 and 2 we obtain

\frac {300-T_{i}}{0.033} +\frac {40-T_{i}}{L/0.05} +100=0  Equation 6

\frac {T_{ i}-40}{L/0.05}+ \frac {25-40}{0.100}=0

T_{i}-40= \frac {L}{0.05}*150

T_{i}-40=3000L

T_{i}=3000L+40 Equation 7

From equation 6 we can substitute wherever there’s T_{i} with 3000L+40 as seen in equation 7 hence we obtain

\frac {300- (3000L+40)}{0.033} + \frac {40- (3000L+40)}{L/0.05}+100=0

The above can be simplified to be

\frac {260-3000L}{0.033}+ \frac {(-3000L)}{L/0.05}+100=0

\frac {260-3000L}{0.033}=50

-3000L=1.665-260

L= \frac {-258.33}{-3000}=0.086*10^{-3}m= 86mm

Therefore, insulation thickness is 86mm

8 0
3 years ago
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