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The crate, of mass 250 kg, hanging from a helicopter (shown in Fig. 2.74(a)) can be modeled as shown in Fig. 2.74(b). The rotor blades of the helicopter rotate at 300 rpm. Find the diameter of the steel cables so that the natural frequency of vibration of the crate is at least twice the frequency of the rotor blades.
a mass of 5 lbm is released when it is just in contact with a spring of stiffness 25 lbfft that is attached to the
a rectangular sunk key 16mm x 12mm thick x 80mm long is required to transmit 1500kn-mm torque from 60mm
the 150-lb fireman is holding a hose which has a nozzle diameter of 1 in and hose diameter of 2 in. if the velocity of
one kg of execute a carnot power cycle. during the isothermal expansion, the water is heated until is is a saturated vapor the pressure is and the quality is. evaluate the heat and work for each process.
n air compressor operates at steady state with air entering at p1 1 bar t1 17 c and exiting at p2 5 bar. the air
Draw the projections of the line and locates its traces.
saturated steam condenses completely to liquid water at a rate of m1 2 kgs at 40 bar pressure saturation temperature
a cylindrical stone mix concrete beam of diameter d 0.5 m initially at ti 20 c is exposed to hot gases at tinfin 500
for a spinning solid circular disk of radius a and constant thickness the maximum stresses occur at thenbspcenter of
explain the tapping operation and the steps to follow peripheral milling is performed on the top surface of a
Label all chip numbers (but not pin numbers). Specify the =12,-12, and +5 power supply connections, resistor values, and capacitor values. Offset null potentiometers are not required.
an energy-source at 1000 k transfers heat to a completely reversible heat engine. this engine transfers heat to a sink
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