Figure 4: Drag Measurement. 4. As wind passes through a windmill it loses kinetic energy, slows down and, as conservation of mass tells us, the cross-sectional area of a volume bounded by streamlines will expand (see Figure 4). Use 1.23 kg/m³ as the density of airand assume no losses in the fluid system, the initial, free-stream wind velocity (U0) is 6 m/s, the windmill generates 1MW of power and its generator is 93% efficient, and the initial diameter of air (Do) is 200 m, determine:(a) D2/D₁ [1.0 - 1.2](b) The percentage of energy extracted from the air. [20% - 30%]

Answered: Image /qna-images/answer/1bed37d0-57a9-41f6-9a71-e1686ca6f4a9.jpg

Answered: Figure 4: Drag Measurement. 4. As wind…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

2. The figure shows a pipe reducing section that is bolted on to the end of a pipe. Water flows through the pipe and the reducing section and exits to the atmosphere. The diameter at station 1 is 20 cm and the diameter at station 2 is 15 cm. The velocity at station 1 is 5 m/s. water ①1 ② Figure for problem 2. (a) If h 22.5 cm, what is the force acting on the flange bolts? (b) Does Bernoulli's equation hold between stations 1 and 2? Explain. mercury
A certain SSSF control volume with a single inflow and outflow and has an inflow speed V₁ = 200 meters / sec and outflow speed Ve = 1000 meters / sec, with a mass-flow-rate m(dot) = 5 kg/ sec. Find the time rate of change of the kinetic energy between the outflow and inflow streams in kW (units must be correct).
A compressor draws in 500 E of air whose density is 0.079 - and discharges ft3 min it with density of 0.304- At the suction, P1 = 15- and at the discharge, P2 = in The increase in the specific internal energy is 33.8 Btu and the heat from lb 80 air by cooling is 13 . Neglecting changes of potential and kinetic energy, Btu determine the work done on the air in - and horsepower,hp. min
Problem 2. A garden hose with an attached nozzle is used to fill a container with water. The nozzle starts at a diameter of 2 cm and is then reduced to 0.8 cm at the exit. In 50 seconds, the nozzle and hose are able to fill the container with 10 gallons of water. Find the volumetric flow rate (m³/s), the mass flow rate (kg/s), and the average velocity (m/s) at the at the nozzle exit. Assume the density p of water is 1000 kg/m³.
1. A propeller 2 f t in diameter moves at 20 f t/s in water and produces a thrust of 1000 lbf . Find the ratio of the upstream to downstream velocities, and the efficiency. 2. An airplane flies at 140 mph at sea level at 60◦F. The propeller diameter is 8 f t, and the slipstream has a velocity of 200 mph relative to the airplane. Find: (a) The propeller efficiency. (b) The flow velocity in the plane of the propeller. (c) The power input. (d) The thrust of the propeller. (e) The pressure difference across the propeller disk.
3
2. In the figure, water circulates through a piping system, servicing various household needs. Considering the water heater as a system, identify locations on the system boundary where the system interacts with its surroundings and describe significant occurrences within the system. Repeat same for the dishwasher and for the shower.
A pump impeller rotating at 1400 rpm has an outside radius of 21 cm, the vane outlet angle β2 is 158° and the radial velocity at the outlet Cr2 is 4 m/s. Assuming radial flow at inlet, draw the theoretical outlet velocity diagram and calculate the various velocities and angles(d)calculate the water horsepower.
Water enters a fountain through a pipe with a cross-sectional area A1 at a flow rate Q. The pressure in the inlet pipe is p1. The water then leaves through a nozzle with a cross sectional area A2 and at an angle 8, as shown in Figure Q5. Both the inlet and the nozzle are at a height h2, and the jet reaches a maximum height 13. You may assume that viscosity is negligible. a) Find the horizontal force on the block b) What is the horizontal-component (u2), vertical component (v2) and magnitude (V2) of the velocity of the jet as it leaves the nozzle? c) What is the maximum height of the jet? You may assume that the horizontal component of velocity is the same at every point in the jet. P₁ A₁ A₂. To h₂ h3 Figure Q5: Jet emitting from a fountain.
4. A pump has a displacement volume of 6in³. It delivers 24gpm at 1000rpm and 1000psi. If the prime mover input torque is 1100in.lb, (a) What is the overall efficiency of the pump? (b) What is the theoretical torque required to operate the pump?
When air expands adiabatically (without gaining or losing heat), it's pressure P and volume V are related by the equation PV^1.4=C where C is a constant. Suppose that at a certain instant the volume is 510 cubic centimeters and the pressure is 87 kPa and is decreasing at a rate of 12 kPa/minute. At what rate in cubic centimeters per minute is the volume increasing at this time?
B/ Water in a rigid, insulating tank is set in rotation and left. Water comes to rest after some time due to viscous forces. Considering the tank and water to constitute the system answer yes or no. (i) Is any work done during the process of water coming to rest? (ii) Is there a flow of heat? (iii) Is there any change in internal energy (U)? (iv) Is there any change in total energy (E)?

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS