Calculating Thermal Expansion and Young's Modulus: A Scientific Inquiry

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The discussion focuses on calculating thermal expansion and Young's modulus, with a user expressing uncertainty about their calculation of 264,000 kPa for a specific problem. They also seek clarification on the time difference in question 4 and request assistance with constants used in their calculations. Key values mentioned include the thermal expansion coefficients for aluminum (2.4 x 10^-5), steel (1.2 x 10^-5), and brass (2.0 x 10^-5), along with the correct Young's modulus for steel, which is 20 x 10^10. The thread highlights the need for peer verification of calculations and constants in physics problems.
ice87
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These are really parts of questions.
http://noether.physics.ubc.ca/physics153/assign22k5.pdf

for number 2, I'm getting 264000kPa, but somehow it just doesn't seem rite, so if you guys can check for me, that'll be great. the other one i don't get is the second part of questions 4 where it asks for a time difference. can anyone help me out here? thanks!
 
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*bump* no one?
 
Could you post what you used for the various constants?

Thermal expanson of Al =?
youngs modulus of steel =?
 
thermal expansion of: Al = 2.4*10^-5, steel: 1.2*10^-5, brass: 2.0*10^-5
young's modulus of steel = 20*10^10 (NOT 2.0*10^10)
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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