Magnitude of the average impact force
A professional diver performs a dive from a platform 10 m above the water surface. Estimate the order of magnitude of the average impact force she experiences in her collision with the water. State the quantities you take as data and their values.
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Calculate the heat transfer of the plate, the bottom is insulated. What is the temperature at the bottom of the plate if the thermal conductivity of the plate is 25 W/m*K.
A block of mass 0.222 kg is placed on the end of a spring which has a stiffness of 150. N/m. It is pulled down 2.60 cm and released. What is the frequency of oscillation? What is the period of oscillation?
A feedwater heater uses extracted steam ( P1=500kPa,x1=100%) to preheat feedwater ( T2=50 celcius, P2=500kPa). Assuming no heat transfer to the surroundings, determine the temperature of exiting misture (stream 3) if m1/m3= 0.075
Molybdenum forms a substitutional solid solution with tungsten. Calculate the concentration (in weight percent) of molybdenum that must be added to tungsten to yield an alloy.
A piston-cylinder contains 0.8 kg of nitrogen initially at 100 kpa and 27 degrees. The nitrogen is compressed slowly in a polytropic process during which pv^1.3 = constant until the volume is reduced by one-half.
Determine the average normal stress at the section a-a and the average shear stress at section b-b in member AB. The cross section is square, 0.5 in. on each side.
If the frequency is variable and the length of the closed (at both ends) tube is fixed at 45 cm, sketch the plastic tube showing the positions of the nodes and anti-nodes for the three lowest resonant frequencies.
With the piston face resting against the stops, the water cools to 25°C. Sketch the two processes in series on a P-v diagram.
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