Recent content by Awer1

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    How Much Does Adding Ice Cool Your Coffee?

    1. An insulated Thermos contains 120 cm3 of hot coffee at 80.0°C. You put in a 19.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and...
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    Graduate Thermal Radiation Energy transfer

    I figured it out with some help, the equation in the book and their website had the equation wrong.. the book had the temperatures flipped
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    Graduate Thermal Radiation Energy transfer

    I have a general question regarding Radiation. If the net Thermal Radiation is understood to be : Pnet = Pabs - Prad= σϵA(Tenv^4 - T^4) . How is it that Pnet is negative if the environmental temp is higher than the temp of the object?
    • Awer1
    • Thread
    • Energy Energy transfer Radiation Thermal Thermal radiation
    • Replies: 2
    • Forum: Thermodynamics
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    Ratio for Kindetic and Potential energy

    oh good I thought I was going crazy. I was only allowed three attempts. so I used three different formats that were all the same thing.. still marked wrong.
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    Ratio for Kindetic and Potential energy

    If the phase angle for a block-spring system in SHM is φ and the block's position is given by x = xm cos(ωt+φ), what is the ratio of the kinetic energy to the potential energy at time t = 0? State your answers in terms of the given variables. x =xm Cos(wt + phi) v = -w(xm)sin(wt +phi)...