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

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.