1)10 m³ /h of water flows through a pipe with 100 mm inside diameter. Calculate the flow velocity inside this pipe. ?

2) A river discharges 100 m³ of water to the sea every 2 seconds. What is the flow-rate of this river expressed in m3/s?

Using MATLAB:

The velocity, v, and the distance, d, as a function of time, of a car that accelerates from rest at constant acceleration, a, are given by

= a n d = 12

Determine v and d at every second for the first 10 seconds for a car with acceleration of = 15 ft/s2. Your output must have exactly the same format as the template table below. Note that dots have been added to the table below; you can count the dots to determine the exact spacings. Also note the units.

··········Time (s) ······· ···Distance (ft) ·········Velocity (mph) ··········x.x·················x.xxe+yy···············x.xxx

A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam enters the first turbine stagge at 12 MPa, 560*C and expands to 1 MPa, where some of the steam is extracted and diverted to the open feedwater heater operating at 1 MPa. The remaining steam expands through the second turbine stage to the condenser pressure of 6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa. The net power output for the cycle is 330 MW. For isentropic processes in the turbines and pumps, determine

(a) The cycle thermal efficiency.

(b) The mass flow rate into the first turbine stage, in kg/s.

(c) The rate of entropy production in the open feedwater heater, in kW/K.

This is a heat transfer problme.

Prove that Nu=4.36 for fully-developed laminar flow in a tube subject to a constant surface heat flux boundary condition.

This was posted before but it was a bit unclear, thanks!

what are  superchargers.

2 and half page.(summary)

The information presented should be technical, current, appropriately detailed, and include elements of design .

Design elements of historical significance are valuable and should be included; however the research and presentation should focus on the current state of the art and future expectations of superchargers, discuss evolution (history) ,current widespread designs, trends -conclusion

include references (web AND papers, books).

Textbook Internal Combustion Engines Applied Thermosciences Third Edition Colin R. Ferguson Allan T. Kirkpatrick Mechanical Engineering Department Colorado State University, USA Internal Combustion Engines

What derivatives associated with static stability for airplanes? How these derivatives may affect dynamic rigid body modes?

A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power cycle with a thermal efficiency of 20%. For the heat pump, Refrigerant 134a is compressed from saturated vapor at -10°C to the condenser pressure of 10 bar. The isentropic compressor efficiency is 80%. Liquid enters the expansion valve at 9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is transferred to the heated space. (a) Determine the power input to the heat pump compressor, in kW (b) Evaluate the ratio of the total rate that heat is delivered to the heated space to the rate of heat input to the power cycle. Round answers to 3 significant digits.

The capacity of a propane vapor-compression refrigeration system is 8 tons. Saturated vapor at 0°F enters the compressor, and superheated vapor leaves at 120°F, 180 lbf/in.² Heat transfer from the compressor to its surroundings occurs at a rate of 3.5 Btu per lb of refrigerant passing through the compressor. Liquid refrigerant enters the expansion valve at 85°F, 180 lbf/in.² The condenser is water-cooled, with water entering at 65°F and leaving at 80°F with a negligible change in pressure. Determine

Round answers to 3 significant digits.

A fixed-mass system contains water (H20) in a rigid (fixed-volume) container. The mass of the water is mass, m= 1.805719781 kgs. A process occurs having the following initial and final thermodynamic properties.

Initial Pressure: P1 = 1000kPa   Initial Temperature: T1 = 600 ^oC   Final Temperature: T2 = 140 ^oC

Determine the following: (Neglect changes in kinetic and potential energy)  

1. 1W2 (work done on.by the system, in kJoules)  

2. 1Q2  (heat transfer to/from the system, in kJoules)

3. (S₂ - S₁)sys (Entropy change of the system, in kJ/K)  

4. What is the maximum temperature of the surroundings (I.e., T₀ in degrees K) for which there is no 2nd Law violation? (Hint: consider the net entropy change, system plus surroundings.)

) One of the major functions of cooling tower is to cool hot but dry gas flow via spray vaporization under a counter-flow mode.  

a);List governing mechanisms (e.g., mass, momentum and heat transfer) and major assumptions for problem simplification;

b);Establish a heat transfer model of gas cooling, as well as a hydrodynamics model of droplet transport that is coupled with gas heating and vaporization

The intial conditions for an air-standard Otto cycle operating with a compresssion ratio of 8:1 are 14.7 psia and 60degF. At the beginning of the compression stroke, the cylinder volume of 270 in^3 and 9 Btu of heat are added to the gas during the constant-volume heating process. Calculate the thermal efficiency and the mean effective pressure of the cycle.

Mahjong, Inc., has identified the following two mutually exclusive projects:

The air mass flow rate of a jet engine is 10 kg/s. The stagnation enthalpy at the exit of the turbine is 918 kJ/kg and the excess air is 4.5.

(a) What should be the mass flow rate of fuel injected in the afterburner, such that the stagnation enthalpy at the end of the afterburner is 1700 kJ/kg?

(b) What is the excess air in the afterburner?

(c) What is the maximum temperature in the afterburner?

A tube is placed vertically in a beaker of salt water with a specific gravity of 1.15. The interfacial tension between the air and the water is 32 mN/m and the contact angle is 30 degrees, calculate:

a) Capillary pressure in psi if the tube diameter is 0.0001 cm.

b) Capillary rise of water in tube.

c) If the cap rock thickness is 2ft, do you think this will stop water migration?

d) Radius in inches of the largest pore, if the displacement pressure is 25 kPa.

An epedemic is spreading form human to human. A hospital counts on the start of the epidemic 100 infected patients visiting on one day. One day later the number of patients coming is 300. Calculate the time constant of the spreading of the disease and calculate when the first infected entered the population. We estimate that the epidemic is controllable by a medicine, a single dose. How many doses do we need if the epidemic is spreading for 14 days?