15-135. A power lawn mower hovers very close over theground. This is done by drawing air in at a speed of 6 m/sthrough an intake unit A, which has a cross-sectional area ofAA = 0.25 m², and then discharging it at the ground, B,where the cross-sectional area is Ag = 0.35 m². If air at A issubjected only to atmospheric pressure, determine the airpressure which the lawn mower exerts on the ground whenthe weight of the mower is freely supported and no load isplaced on the handle. The mower has a mass of 15 kg withcenter of mass at G. Assume that air has a constant densityof p. = 1.22 kg/m³.Lall

Given, Va = 6 m/s AA = 0.25 m2 AB = 0.35 m 2 m = 15 kg ρa = 1.22 kg/m 3 Rate of air flow to the lawn…

Answered: 15-135. A power lawn mower hovers very…

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

Assuming that the fluid enters to the pump with no shock / no swirl, construct the velocity triangles at both inner and outer diameters of the impeller for the case where the blade angle at the outlet is: β2 = 90o, and β2 = 130o
The military jet aircraft has a gross weight of 28,000 lb and is poised for takeoff with brakes set while the engine is revved up to maximum power. At this condition, air with a specific weight of 0.0753 lb/ft is sucked into the intake ducts at the rate of 112 Ib/sec with a static pressure of -0.28 Ib/in.? (gage) across the duct entrance. The total cross-sectional area of both intake ducts (one on each side) is 1630 in.? The air-fuel ratio is 16.2, and the exhaust velocity u is 2630 ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon release of the brakes. Answer: a = ft/sec2
find reynolds
Q1:Air enters a diffuser at 200 m/s with a pressure of 80 kPa and a temperature of -20°C. It leaves with a velocity of 15 m/s at an atmospheric pressure of 95 kPa. If the inlet diameter is 100 mm, determine : 1- the enters density is : Take R= 0.287 e exit area is *
Obtain the slippery velocity using the two methods of center rotation and radius rotation.
6-58 Water is flowing into and discharging from a pipe U- section as shown in Fig. P6-58. At flange (1), the total absolute pressure is 200 kPa, and 30 kg/s flows into the pipe. At flange (2), the total pressure is 150 kPa. At location (3), 8 kg/s of water discharges to the atmosphere, which is at 100 kPa. Determine the total x- and z-forces at the two flanges connecting the pipe. Discuss the significance of gravity force for this problem. Take the momentum-flux correction factor to be 1.03. 8 kg/s -3 cm 22 kg/s + - f10 cm 30 kg/s 5 cm
From the figure, the piston is pushed into the cylinder. If the average speed of Fluid moving up to 5 m/s. Calculate the velocity v of the piston while it is moving into the cylinder.
A 60° bend occurs in a water pipeline that reduces from 600 mm diameter to 300 mm diameter at the bend (inside bend angle 120). If the gauge pressure at the inlet is 172 KPa, determine the magnitude ad angle of the thrust on the bend when the flow is 0.85 m3/s. Hint: start by calculating the initial and final velocities, then the final pressure. Next, analyze the pressure and momentum forces in the x and y planes.
Problem 2 - Determine the greatest possible mass flow through the nozzle if the throat has a diameter of 50 mm. The air in the reservoir has an absolute pressure of 400 kPa and a temperature of 30°C. I mm
12-41 Explain why the maximum flow rate per unit area for a given ideal gas depends only on P₁/√T. For an ideal gas with k = 1.4 and R = 0.287 kJ/kg-K, find the constant a such that m/A* = aP₁/√To-
Air enters into the hollow propeller tube at A with a mass flow of 3.5 kg/s and exits at the ends B and C with a velocity of 300 m/s, measured relative to the tube. The tube rotates at 1500 rev/min 05 m -1500 rev/min a5 m Part A Determine the frictional torque M on the tube. Express your answer to three significant figures and include the appropriate units.
The momentum equations for a rotating shallow homogeneous fluid with a free upper surface (i.e. the shallow water equations) may be written as Du Dt Dv Dt Əh дх Əh ду = +fv-g for (+ f, where = = = -fu-g- where u(x, y, t), v(x, y, t) are the velocities on the free surface, and h(x, y, t) is the depth of the free surface. (a) Rewrite (1) and (2) by expanding the total derivative operator D Ə Ə = +2= +v Dt Ət əx ду (b) Use the two equations you developed in Part(a) to derive the evolution equation Əv - Oy. In other words, show that dy (1) (2) ?u Əv + дх ду { (S + ƒ ) = − ( 5 + £ ) ( ² Dt (3) being careful to explain the steps. [Hint: start by deriving the equation for and then use the fact that the Coriolis parameter f = f(y) only.]

SEE MORE QUESTIONS

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