Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
If a mass of cobalt is replaced by a compound with a density of 4.13 Mg/m^3 and results in a mass reduction of 0.79 kg, what is the volume being replaced? Show your work.
Estimate the density of an aluminum-magnesium alloy used for soda cans as a weighted average of the densities of constituent elements: 47% Mg, 18% Al, 10% Si, and 15% Fe.
Depreciation value is $28 K, based on a 32.9% depreciation. The maintenance cost are 7, and new staffing cost are $32 K. What is the payback period? P= C / ((W+I+D) - (M + S).
Determine the force of the rod on the particle and the normal force of the slot on the particle when theta=30. the rod is rotating with a constant angular velocity of 2 rad/s.
Which is probably mechanically tougher, the bone or the ligament? We calculated Young's Modulus for each but aren't sure of how to relate Youngs Modulus to Toughness.
Determine the total energy consumption (in kJ), when all of these electric devices are on from 12:30 pm to 4:30 pm, while the fan is off.
The tank is not very well insulated. After many hours, the temperature is measured to be 310 K again. How much heat (if any) the refrigerant lost?
Estimate the pressure on your hand when you hold it in the stream of air coming from the air hose at a filling station. List all assumptions and show calculations.
If the robot's lifting arm has an efficiency of 30% and require 9 seconds to raise the rock 20 centimeters, how much power in watts did the arm use?
A gas in an insulated tank is separated from an evacuated region by a membrane. The membrane is removed and the gas is expanding. Is it internally or externally reversible or neither? Why?
Design a turbojet engine to flight at an altitude of 10000m. The pressure ratio across the compressor is 3. The turbojet inlet temperature is 1400k.
There is much consternation between your associates as to what type of gas it is. The tank is located near sea level, and you have access to tables of properties. Which gas to you tell them it is?
A pressure gage connected to a tank of oxygen reads 50 psi, and the temperature of the oxygen is 80°F. If the local atmospheric pressure is 14.7 psia, determine the specific weight of the oxyge
Draw a schematic of the system. Using electric resistance heaters, determine (b) the required power (kW) needed to raise the water temperature and (c) the entropy generation rate (kW/K).
Determine the magnitude of the particle's displacement from t=0 to t=3s. Use Simpson's rule with n=100 to evaluate the integrals. What is the magnitude of the particle's acceleration when t= 2s?
Determine (a) the pump work, wk, per kilogram of steam (b) the average density of steam, assuming that the pump is reversible in nature.
Calculate the flow energy per pound-mass, enthalpy, and total enthalpy. Two kilograms of ammonia at 200kPa, .755 m^3/kg, and internal energy of 1405.6 kJ/kg.
Refridgerant 410a is initially at 120 F and quality of 30%. It undergoes a constant-pressure process. The final state is at 70 F. Determine the initial specific enthalpy.
Determine (a) the tractive force exerted by each locomotive at 16 mi/hr, (b) the power required from each locomotive at 16 mi/hr, (c) the power required from each locomotive as the train speed appro
Determine the distance, H, that the sea water rises within the cylinder as a function of the depth, D, of the lower edge of the cylinder. Perform calculations to determine H for depths of 0, 0.25L, 0
Its specific heat ratio is 1.4 and gas constant is 0.287 kJ/kg-K. a) A regenerative Brayton cycle with a regenerator effectiveness of 80%. b) Cycle of part (a) with intercooling to 20 C.
Determine the efficiency and the horsepower output if the cutoff ratio is halved. Assume the air is an ideal gas with constant specific heats. Its specific heat ratio is 1.4 and gas constant is 0.28
Calculate the overall efficiency, the heat rate [MW], and the total fuel rate [kg/s] of a combined-cycle power plant (1) if no supplemental firing is used.
When a 2000 lb vehicle is empty, the static deflection of its suspen- sion system is measured as 0.8 in. What is the natural frequency of the vehicle when it is carrying 700 lb of passengers and ca
Determine the following: i) The compressor efficiency, assuming constant specific heat ( Cp = 1.005 kJ/kg * K, k = 1.4) ii) The primary combustor heat transfer (kJ/kg), assuming variable specific he