# Physics

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The small tapered bar BC has length L=0.1 m and is made of a homogeneous material with Young’s modulus E=10 GPa. The cross sectional area of the bar is slowly varying between A0=160 mm^2 (at B) and A0/2 (at C), as described by the function:

A(x)=A0/(1+(x/L))

The bar is fixed at B and a load P=8kN is applied at the free end C. Determine the total elongation, δ, of the bar. (in mm)

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-0.71 mm
Problem 3) 184 MPA

Anyone for Problem 1 and 2 please?

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Thanks FLu!

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Great thanks!

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RORO, it worked for me, there must be tolerance, try -0.73 and let me know if it work?

Do you have problem 1 and 2?

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Yes, must have something to do with tolerance RORO, try -0.73, there was technical issue before.

RORO did you get problem 1 and 2 please?

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Anyone for problem 1&2?

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Ok, thanks. No, I hav not solution for 1 and 2!

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Anyone Problem 1 and 2 please?

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anybody have the solution of problem 1 and 2?

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Pretty please with sugar on top?

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I figured out the first answer, it was very simple, just had to multiplicate density(kg/m^2) x area(m^2) x gravity(m/s^2)= (kg m/s^2)= (N)

So:fx(x)=rho_1*g*A

I don't understand why f depends on x

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Anonymous, tried it out but it says rho_1 not allowed in answer. How did you manage?

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same problem!

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The first answer for the first exercise should be: rho_1*g*A

Try typing it, not copy/paste.

rho_1 isn't allowed for L/2 to L

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Thanks Anonymous now it worked.
Have you had luck with Problem 2?

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fx(x)=rho_2*g*A for L/2 to L

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Thanks RORO, any luck with the second Problem set?

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THanks guys, anybody managed other problem in 1 and 2?

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I cannot understand the solution of f(x)=rho_1*g*A plz give the two words of question as a hints

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I cannot understand the solution of f(x)=rho_1*g*A plz give the two words of question as a hints

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If you don't understand the solution then you have to read the exercises at least.

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F10 is right. DO you have managed Problem 1 or 2 F10?

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I read but I don't understand because some guys talking on one question and some guys talking on other question at the same time.

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Anyone for Problem 1 and 2 please?

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A blade is fixed to a rigid rotor of radius R spinning at ω rad/sec around the vertical z-axis (see figure). Neglect the effects of gravity.

4.
5.Calculate the peak stress in the blade: σmaxn
7.Calculate the displacement of the blade mid-section: ux(L/2)
8.Given:
9.Young's modulus, E , mass density, ρ .
· Constant cross sectional area, A
· Angular velocity ω
(Hint: if you work in the non-inertial frame of the rotating blade, the d'Alembert force/unit volume is ρω2r along the +x direction)
1. Try it:
2. σmaxn=
3.
5.
6.
7.
8.
1.
2. Try it:
3. δ=
4.
6.
7.
8.
9.
1.
2. Try it:
3. ux(L/2)=
4.
6.
7.
8.

A blade is fixed to a rigid rotor of radius R spinning at ω rad/sec around the vertical z-axis (see figure). Neglect the effects of gravity.
Calculate the peak stress in the blade: σmaxn
Calculate the displacement of the blade mid-section: ux(L/2)
Given:
Young's modulus, E , mass density, ρ .
· Constant cross sectional area, A
· Angular velocity ω
(Hint: if you work in the non-inertial frame of the rotating blade, the d'Alembert force/unit volume is ρω2r along the +x direction)
plzzzzzzzzzzzzzzzz help.

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Problem 1 and 2?

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ANy further Problem 1 and 2 answers?

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No, sorry was not succesful, any other had chance with problems 1 and 2?

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Please other Problem 1 & 2!

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Other problems in 1 and 2 please?

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Help problem 1 and 2?

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The composite bar is composed of an inner core of cross sectional area A and a sleeve of cross sectional area . The Young's modulus of the sleeve is and the modulus of the core is . Under the effects of unknown distributed loading, , the bar is observed to deform. The measured displacement field in the bar is , where is a dimensional constant and is the length of the bar. The origin of the x-axis is at the fixed support,10M . The maximum magnitude (absolute value) of stress in the core is found to be Pa.
plz help

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