978-0073398242 Chapter 14 Solution Manual Part 10

subject Type Homework Help
subject Pages 9
subject Words 1351
subject Authors Brian Self, David Mazurek, E. Johnston, Ferdinand Beer, Phillip Cornwell

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PROBLEM 14.64
The stream of water shown flows at a rate of 550 liters/min and moves
with a velocity of magnitude 18 m/s at both A and B. The vane is
supported by a pin and bracket at C and by a load cell at D that can exert
only a horizontal force. Neglecting the weight of the vane, determine the
components of the reactions at C and D.
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PROBLEM 14.65
The nozzle shown discharges water at the rate of 3
40 ft /min. Knowing
that at both A and B the stream of water moves with a velocity of
magnitude 75 ft/s and neglecting the weight of the vane, determine the
components of the reactions at C and D.
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PROBLEM 14.66
A stream of water flowing at a rate of 1.2 3
m/min and moving
with a velocity of magnitude 30 m/s at both A and B is deflected
by a vane welded to a hinged plate. Knowing that the combined
mass of the vane and plate is 20 kg with the mass center at point
G, determine (a) the angle ,
(b) the reaction at C.
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PROBLEM 14.67
A stream of water flowing at a rate of 1.2 3
m/min and
moving with a velocity of magnitude v at both A and B is
deflected by a vane welded to a hinged plate. The combined
mass of the vane and plate is 20 kg with the mass center at
point G. Knowing that 45 ,
determine (a) the speed v of
the flow, (b) the reaction at C.
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PROBLEM 14.68
Coal is being discharged from a first conveyor
belt at the rate of 120 kg/s. It is received at A by
a second belt that discharges it again at B.
Knowing that
1
3 m/sv
and
2
4.25 m/sv
and that the second belt assembly and the coal
it supports have a total mass of 472 kg,
determine the components of the reactions at C
and D.
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PROBLEM 14.68 (Continued)
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PROBLEM 14.69
The total drag due to air friction on a jet airplane traveling at 900 km/h is 35 kN. Knowing that the exhaust
velocity is 600 m/s relative to the airplane, determine the mass of air that must pass through the engine per
second to maintain the speed of 900 km/h in level flight.
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PROBLEM 14.70
While cruising in level flight at a speed of 600 mi/h, a jet plane scoops in air at the rate of 200 lb/s and
discharges it with a velocity of 2100 ft/s relative to the airplane. Determine the total drag due to air friction on
the airplane.
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PROBLEM 14.71
In order to shorten the distance required for landing, a jet airplane is equipped
with movable vanes, that partially reverse the direction of the air discharged by
each of its engines. Each engine scoops in the air at a rate of 120 kg/s and
discharges it with a velocity of 600 m/s relative to the engine. At an instant when
the speed of the airplane is 270 km/h, determine the reverse thrust provided by
each of the engines.
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PROBLEM 14.72
The helicopter shown can produce a maximum downward air
speed of 80 ft/s in a 30-ft-diameter slipstream. Knowing that
the weight of the helicopter and its crew is 3500 lb and
assuming
3
0.076 lb/ft
for air, determine the maximum
load that the helicopter can lift while hovering in midair.

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