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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 light single-engine airplane such as the piper super cub. if the maximum gross weight of the airplane is
an evacuated 150 l tank is connected to a line flowing air at room temperature 25 degrees c and 8 mpa pressure. the
r-134a is contained in a vertical cylinder fitted with a frictionless piston and a set of stops and the volume is
in the design of an automobile radiator an engineer has a choice of using either a brass-copper alloy casting or a
Prove that the transformation Q1 = q12 Q2 = q2 sec p2 p cos p2 - 2q2 P= 1 P2 = sin p2 - 2q1 1 2q1 cos p2 is canonical, by any method you choose . Find a suitable generating function that will lead to this transformation.
you have a bevel gear and shaft and you have to find the maximum load that can be applied on it. what type of
1 current airbag regulations specify that they must only pass a test designed to protect a 175 pound male who is not
you balanced a pump impeller by placing a 5 gram weight at a radius of 100 mm. the original vibration amplitude was 10
100 kg of liquid water at 25C and 50 kg of ice at 0C are placed in an isolated container. (a) (b) (c) Find the initial volume of the liquid-ice mixture, in m3. Determine the volume after all the ice is melted, in m3. Will the temperature of the li..
a disk has a mass of 4kg and a radius of 90mm it is at rest when it is placed in contact with the belt which moves with
a piston-cylinder device containing air undergoes a polytropic compression process from 2 liters 300 kpa and 20 degc to
The system is at rest in the position shown, with the 12-lb collar A resting on the spring (k = 20 lb/ft), when a constant 30-lb force is applied to the cable. What is the velocity of the collar when it has risen 1 ft? The collar is attached to th..
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