Thermo Questions: Final Pressure & Cooling Time

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In summary, the first question asks for the final pressure of a gas that increases in temperature from 40 C to 120 C while also increasing in volume from 1 m3 to 1.3 m3, with an initial pressure of atmospheric pressure. The second question estimates the time it takes for a block of steel to cool from 20.0 C to 0 C, assuming it loses thermal energy through conduction from all six faces. The equations provided do not seem to give enough information to determine the pressure or cooling time accurately. The poster is requesting clarification on whether they are using the correct equations.
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zack7
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Homework Statement


1.A gas increases in temperature from 40 C to 120 C while increasing in volume from 1 m3 to 1:3 m3. Find the
nal pressure, if the initial pressure is atmospheric pressure.

2.Estimate the length of time it takes for a 0.1 m x 0.1 m x 0.1 m block of steel to cool from 20.0 C to 0 C,
assuming that it loses thermal energy by conduction through all six faces.

Homework Equations


Q1
ΔV = b V0 Δ T
but this equation does not give me the pressure and I have no idea whether any other equation relates the info I got with pressure
Q2
H =
dQ
dt
= kA(TH - TC/L)
Is it I don't have enough info or is the equation I am using wrong?
 
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  • #2
anyone can help me please I just need to know whether I am using the right equations.

Thank you
 

FAQ: Thermo Questions: Final Pressure & Cooling Time

What is the equation for final pressure in a thermo question?

The equation for final pressure in a thermo question is:

Pfinal = (Pinitial * Vinitial) / Vfinal

How do you calculate cooling time in a thermo question?

To calculate cooling time in a thermo question, you can use the following equation:

tcool = (m * Cp * ΔT) / hA

where m is the mass, Cp is the specific heat capacity, ΔT is the change in temperature, h is the heat transfer coefficient, and A is the surface area.

What is the unit for final pressure in a thermo question?

The unit for final pressure in a thermo question is typically in Pascals (Pa) or atmospheres (atm).

How can you determine if a system is at equilibrium in a thermo question?

A system is at equilibrium in a thermo question when there is no further change in the system's properties over time. This can be determined by observing if the pressure, temperature, and other relevant variables remain constant.

What is the ideal gas law and how is it used in thermo questions?

The ideal gas law is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature. In thermo questions, this equation is often used to calculate the initial or final pressure of a gas in a given system.

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