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An 84.5 kg hiker is trapped on a mountain ledge following a storm. A helicopter rescues the hiker by hovering above him and lowering a cable to him. The mass of the cable is 8.00 kg, and its length is 14.6 m. A sling of mass 70.0 kg is attached to the end of the cable. The hiker attaches himself to the sling, and the helicopter then accelerates upward. Terrified by hanging from the cable in midair, the hiker tries to signal the pilot by sending transverse pulses up the cable. A pulse takes 0.250 s to travel the length of the cable. What is the acceleration of the helicopter?Neglecting stiffness, how long does it take for a signal to reach the helicopter if it accelerates at 0.750 m/s2 upwards? t = s
an air-standard cycle with variable specific heats is executed in a closed system and is composed of the following four
in each cycle of its operation a refrigerator removes 17j of heat from the inside of the refrigerator and releases 40j
water flowing from the oscillating slit produces a velocity field givin by vuosinwt-yvoi voj where uo vo and w are
what are the properties of petrol that it make particularly suitable for the use as fuel in a motor vehicle.
consider a submarine cruising at 0.18 ms far below the surface in sea water at 20 degree c. a 150-scale model of the
an industrial process requires an atmosphere having a rh of 88.4 at 22 degree c and involves a flow rate of 2000 m3h.
three parallel flat plates are separated by two fluids. plate 1 on the bottom is at rest. water viscosity 0.8007 cp at
a tank open to the atmosphere initially contains 2 lb of liquid water initially at 80degf and 0.4 lb of ice initially
a thermal reservoir at 1500 r transfers heat to 1lbm of air in a piston-cylinder device maintained at a constant
design a combinational circcuit with three inputs x y and z and three outputs a b and c. when the binary input is 0 1 2
a tank of 50 ft3 volume contains saturated ammonia at a pressure of 200 lbfin2. initially the tank contains 50 liquid
The unit cell for uranium has orthorhombic symmetry with a, b and c lattice parameters of 0.286, 0.587, 0.495 nm, respectively. If its density, atomic weight, and atomic radius are 19.05 g/cm3, 238.03 g/mol, and 0.1385 nm, respectively, compute th..
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