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An experiment involves heating a very small sphere that is suspended by a fine string in air with a laser beam in order to induce the highest sphere tempera- ture possible. After inspecting Equation 9.64, a research assistant suggests inducing a uniform down- ward airflow to exactly offset free convection from the sphere, thereby minimizing heat losses and maxi- mizing the steady-state sphere temperature. In the limiting case of a very small sphere, what is the minimum value of the convection heat transfer coefficient expressed in terms of the sphere diameter and thermal conductivity of the air?
at the beginning of the compression process of an air-standard otto cycle p1 14.7 lbin2 and t1 530degr. the maximum
A piston cylinder closed system expands from state 1 to state 2 due to heat addition and then is compressed from state 2 to state 3. If this process (1-2-3) is a cycle, what can be said about Temperature (T) and Pressure (P)?
consider an 8-l evacuated rigid bottle that is surrounded by the atmosphere at 100kpa and 17 degrees c. a valve at the
the steam turbine power plant uses water as the working fluid and will be modeled as a simple ideal rankine cycle. the
a tank contains 2500 m3 of salt solution with a salt concentration of 20 kgm3. at time zero salt free water starts to
a rigid tank has a volume of 0.06m3 and initially contains a two-phase liquid-vapour mixture of h2o at a pressure of 15
A 1200-kg station wagon is moving along a straight highway at 12.0 m/s. Anothe r carw ith mass 1800kg and speed 20.0 m/s has its center of mass 40.0 m ahead of the center of mass of the station wagon. Find the magnitude of the total momentum of th..
Describe an Arrow-Debreu equilibrium in the new situation. What are the expected utilities of the two men in this situation, where the expectation is calculated from the point of view of a moment just before the new technology provides the informa..
pertains to vertical piston-cylinder assembly. a vertical shaft whose cross-sectional area is 0.8cm2 is attached to the
A 2.64 kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The copper part and water can be modeled as incompressible with specific heats of 0.385 kJ/kg. K and 4.2 kJ/kg.K, respectively. For..
a light inelastic string of length 1.5m fixed at one end carries a particle p of mass 4 kg at the other end. if the
this system has a hydraulic cylinder with a suspended load of 0 which is removed. the cylinder piston and rod
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