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The lowest temperature that has been achieved is about 1 × 10-6 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem, namely nuclear cooling. This process is similar to magnetic cooling, but it involves the magnetic moment associated with the nucleus rather than that associated with certain ions in the paramagnetic salt. Suppose that 10 µJ is to be removed from a specimen at an average temperature of 10-5 K (ten microjoules is about the potential energy loss of a pin dropping 3 mm). Find the work input to a Carnot heat pump and its coefficient of performance to do this assuming the ambient is at 300 K.
consider a steam turbine in which steam enters at 10.45 mpa and 780k with a flow rate of 38.739 kgs. a portion of the
If the trap door's weight is 50N. Calculate the tension in the string and the reaction at the hinge.
two kg of propane are initally saturated liquid at 0c. it undergoes an isentropic process that cools it to -40c.a what
if a mass of cobalt is replaced by a compound with a density of 4.13 mgm3 and results in a mass reduction of 0.79 kg
multi-stage flash distillation is used to desalinate seawater so it is fit for human consumption. a flash distillation
consider a steam turbine operating at steady-state. there is one inlet and one outlet tand adiabatic conditions may be
a spark-ignition engine has a compression ratio of 8 an isentropic compression efficiency of 85 and an isentropic
consider an alcohol and a mercury thermometer that read exactly 0 c at the ice point and 100 c at the steam point. the
determine the smallest horizontal force required to pull out wedge a. the crate has a weight of 200 and the coefficient
the beam is to be hoisted using two chains if the resultant force is to be 600n directed along the positive y axis
surface geostrophic velocity 0.5 ms density 1026kgm3 gravity 9.8ms ring radius 50km. you take velocity measurment
a 12 ft by 12 ft square room has one exterior wall with a surface temperature of 58f and three interior wall surface
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