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An 1800-W electric resistance heating element is immersed in 40 kg of water initially at 20oC. Determine how long it will take for this heater to raise the water temperature to 80oC.
What is the maximum length of longitudinal through crack that can be permitted with a safety factor of 3, if the material has a fracture toughness Kic=50 MPa sqrt(m)?
Sketch the process in series on P-V coordinates. Evaluate the (a) volume at state 2, in ft3, (b) work for each process, in Btu.
The initial guesses for the root are assumed to be x0=3 and x1=2 . Given f (3) =28 and f (2)= 4 , what is the angle the secant line makes with the x -axis?
The compression process is adiabatic, and temperature at the compressor exit is 140F. Determine the mass flow rate of refrigerant, in lbm/min.
All other aspects of the operation follow the ideal cycle. You must draw a schematic for this problem. Determine the net work developed per unit mass of steam flow, in Btu/lbm.
Compute the surface heat transfer coefficient due to natural convection during the initial cooling period. The diameter of the container is 1 m and it is 2 m high.
Water at 20 degrees Celsius is flowing with velocity of 0.5 m/s between two parallel flat plates placed 1 cm apart. Determine the distances from the entrance at which the velocity and thermal bound
Based only on a comparison of their impaction numbers, what will be the ratio of particles collected (5 micrometer to 1 micrometer)? Show work.
Assuming Stokes behavior, calculate the terminal settling velocity in standard air for the following particles: a. diameter = 10 micrometers, specific gravity =1.2.
Determine the load required to compress the specimen to a height of (a) 62 mm and (b) 58 mm assuming that the cross section increases uniformly.
The principle sources of this radioactivity were 137Cs (half-life of 30.2 yr) at 156 Ci/cm3 and 134Cs (half-life of 2.06 yr) at 26 Ci/cm3. How many atoms per cm3 of each of these radionuclides were
How many cubic meters of ore at an average density of 2.8 g/cm3 had to be excavated to provide the uranium if the ore grade was 0.8 w/o?
The steam expands to 15.0 psi a with a specific volume of 27.34 ft^3/Ibm and a final internal energy of 1080.1 BtuIbm. Calculate the velocity at the exit of the nozzle.
First a neutron is removed from the uranium-238 nucleus, then an alpha particle from the resulting product nucleus. Calculate the total energy in MeV required for both processes.
A steam turbine receives steam at 110 ft/s velocity and 1525 Btu/Ibm enthalpy. The steam leaves at 810 ft/s and 1300 Btu/Ibm enthalpy. What is the work out in Btu per pound mass flowing?
If the block is pulled down 100 mm from equilibrium and released from rest when the external force begins to act (at t = 0), what is the equation of motion of the suspended mass, y(t)?
If the crate starts from rest and achieves a speed of 10 m/s in 5s determine the magnitude of P. The coefficient of kinetic friction between the crate and the ground is mu k = 0.2
If D= 10 cm, h=.6 cm and Q=0.380 m^3/s, what are the velocity In the pipe and the acceleration at point A where r =20 cm?
An electric resistance heater in the tank transfers energy to the water at a constant rate of 60 W for 2.5 hour. Determine the final temperature of the water in the tank, in°C and the final pres
Determine the amount of heat transfer Q that must be done during this proccess for the given initial and final conditions.
Superheated water vapor initially at 15 bar and 440°C is cooled at constant pressure to a saturated vapor state and is then cooled at constant volume to a final temperature of 120°C.
First, assuming no heat transfer between the rock and air and no other losses, what is the initial velocity of the stone as it left the catapult in [m/s]?
A cylinder containing 0.9 kg of ammonia has an externally loaded piston. Find the total work for the process, assuming a piecewise linear variation of P versus V.
Before developing the dead-weight gauge, he worked in a mine shaft, and used a mercury manometer for measurements of pressure to more than 400 bar. Estimate the height of the manometer required.