Finding mass in a quanity of heat problem

  • Thread starter Thread starter Damien20
  • Start date Start date
  • Tags Tags
    Heat Mass
AI Thread Summary
In a heat treatment problem, a copper part cools from 400°C to 30°C, losing 80 kcal of heat. The relevant equation used is Q=mcΔT, where m is mass, c is specific heat, and ΔT is the temperature change. The attempted solution rearranges the formula to m=Q/(cΔT) and substitutes values for specific heat and temperature change. There is uncertainty about the correctness of the calculation, indicating a need for clarification on the setup and execution of the formula. Proper application of the formula is essential for determining the mass accurately.
Damien20
Messages
5
Reaction score
0

Homework Statement



In a heat treatment, a hot copper part is quenched with water, cooling it from 400 degrees Celsius to 30 degrees Celsius. What was the mass of the part if it loses 80 kcal of heat.


Homework Equations



Q=mcΔT

The Attempt at a Solution



m=c ΔT/Q m=(0.093cal/g*C°)(370 C° )/ 80Kcal


I gave this a shot but I don't feel like it's right. Any help and hints or even just setting up the formula is appreciated big time. I have a feeling this one is kind of obvious I'm just not seeing it.
 
Physics news on Phys.org
Damien20 said:

Homework Statement



In a heat treatment, a hot copper part is quenched with water, cooling it from 400 degrees Celsius to 30 degrees Celsius. What was the mass of the part if it loses 80 kcal of heat.


Homework Equations



Q=mcΔT

The Attempt at a Solution



m=c ΔT/Q m=(0.093cal/g*C°)(370 C° )/ 80Kcal

m = Q/cΔT
 
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}...
I was thinking using 2 purple mattress samples, and taping them together, I do want other ideas though, the main guidelines are; Must have a volume LESS than 1600 cubic centimeters, and CAN'T exceed 25 cm in ANY direction. Must be LESS than 1 kg. NO parachutes. NO glue or Tape can touch the egg. MUST be able to take egg out in less than 1 minute. Grade A large eggs will be used.
Back
Top