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

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Pravinbhai
14-54. The sports car has a mass of 2.3 Mg and accelerates at 6 m/s, starting from rest. If the drag resistance on the car due to the wind is Fp = (10v) N, where v is the velocity in m/s, determine the power supplied to the engine when 1= 5 s. The engine has a running efficiency of e = 0.68. Probs. 14-53/54
F13–14. The 0.2-kg ball is blown through the smooth vertical circular tube whose shape is defined by r = (0.6 sin 0) m, where e is in radians. If 0 = (7 P) rad, where t is in seconds, determine the magnitude of force F exerted by the blower on the ball when t = 0.5 s. %3D 0.3 m
14-61. If the jet on the dragster supplies a constant thrust of T = 20 kN, determine the power generated by the jet as a function of time. Neglect drag and rolling resistance, and the loss of fuel. The dragster has a mass of 1 Mg and starts from rest. т
15-133. The tractor together with the empty tank has a total mass of 4 Mg. The tank is filled with 2 Mg of water. The water is discharged at a constant rate of 50 kg/s with a constant velocity of 5 m/s, measured relative to the tractor. If the tractor starts from rest, and the rear wheels provide a resultant traction force of 250 N, determine the velocity and acceleration of the tractor at the instant the tank becomes empty.
6-7. Water flows through the hose with a velocity of 4 m/s. Determine the force that the water exerts on the wall. Assume the water does not splash back off the wall. 100 mm 4 m/s
The sports car has a mass of 4000 Kg, and while it is traveling at 35 m/s the driver causes it to accelerate at 7 m/s². If the drag resistance on the car due to the wind is F, = (1.3v) N, where v is the velocity in m/s, determine the power supplied to the engine at this instant. The engine has a running efficiency of e= 0.60. F,
The fire boat discharges two streams of seawater, each at a flow of 0.35 m^3 and with a nozzle velocity of 40 m/s Determine the tension developed in the anchor chain, needed to secure the boat. The density of seawater is ρsw = 1020 kg/m^3
While travelling on a dirt road, the bottom of a car hits a sharp rock and a small hole develops at the bottom of its gas tank. If the height of the petrol in the tank is h=h= 31 cmcm, determine the initial velocity of the petrol at the hole. Given that there are no minor or major losses and density of petrol is ρ=ρ= 778 kg/m3
*6-56. Water flows through A at 6 m/s and is discharged into the atmosphere at B and C. Determine the horizontal and vertical components of force, and the moment exerted on the elbow at A. Neglect the weight of the pipe and the water within it. Problem 6-56 A- 200 mm E 6 m/s 60 mm 500 mm 40 mm B V60% 20 mm
The feasibility of a one-passenger VTOL (vertical takeoff and landing) craft is under review. The preliminary design calls for a small engine with a high power-to-weight ratio driving an air pump that draws in air through the 62° ducts with an inlet velocity v = 45 m/s at a static gage pressure of -1.246 kPa across the inlet areas totaling 0.1355 m². The air is exhausted vertically down with a velocity u = 408 m/s. For a 82-kg passenger, calculate the maximum net mass m of the machine for which it can take off and hover. (See Table D/1 for air density.) 62 F Answer: m = Ti TYP 6274 kg

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