For a system with a 10 MHz bandwidth, 1) determine approximately the maximum subcarrier spacing. 2) Then determine the number of subcarriers required to satisfy this maximum subcarrier bandwidth. 3) Assume that the number of subcarriers is a power of 2 such that 2ⁿ; n ϵ Z. Assume that the maximum delay spread is given by:
(a) Indoor, 20 ns
(b) Large building, 200 ns
(c) Outside, 2 μs
(d) Metal ship's hold, 200 μs

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?