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Application: The monopole antenna. A short monopole antenna is used at 1 MHz for AM transmission. The antenna is 1 m long and placed vertically above a conducting surface. Find:
The radiation resistance of the monopole.
(b) The radiated power of the monopole for a given current.
(c) The directivity of the monopole.
A copper ball with a diameter of 2 cm is removed from an oven at a uniform temperature of 200°C. Upon removal from the oven, it is subjected to a flow of air at 1 atm and 20°C with a velocity of 8 m/s for a certain period of time so the surface tempe..
An inventor claims to have developed a refrigeration unit with a COP of 8.5 which maintains the refrigerated space at -10oC while operating in a room where the temperature is 25oC. Can this claim be correct?
if a vsdmotor combination has a torque of 100 n.m at the rated speed and full power what is the maximum torque it can
Refrigerant 134a enters a 28-cm diameter pipe steadily at 200 kPa and 200C with a velocity of 5 m/s. The refrigerant gains heat as it flows through the pipe and leaves the pipe at 180 kPa and 400C.
a gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processesprocess 1-2
a 30-l electrical radiator containing heating oil is placed in a 50 m3 room. both the room and the oil in the radiator
a tank of 50 cubic feet contains saturated ammonia at 100 f and a quality of 50. vapor is withdrawn from the top of the
A body of mass 1 kg is whirled in a horizontal plane at the end of a spring. The spring stiff ness is 5 kN m 1 and the initial distance from the centre of rotation to the centre of the body is 200 mm. What will be the extension of the spring at a ..
Consider a sample of thickness L = 25 mm and a square planform of width W = 250 mm. In an experiment per- formed under steady-state conditions, temperature mea- surements made at the lower and upper surface of the sample yield values of T1 = 150°C..
A paperclip is made of wire 1.25mm in diameter. If the original material from which the wire is made was 15mm in diameter, calculate the longitudinal and diametrical engineering and true strains that the wire has undergone during processing.
a homogeneous cylinder with weight g and radius r lay on a roughnbsphorizontal floor and adjoins to a rough vertical
A 10-kg block swings down and strikes an identical block. Assume that the 6-m rope breaks during impact and the coefficient of restitution is zero. How long will it be before m2 comes to rest? How far will it have traveled? What is the percentage o..
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