The pitch of the whistle of an engine appears to drop to 5/6 th of its original value when it passes a stationary observer. If the speed of sound in air is 350 m/s, the speed of the engine is

Question:

Options :

(a) 35 m/s
(b) 70 m/s
(c) 105 m/s
(d) 140 m/s

Answer :

(b) 70 m/s

Answer Steps :

step 1

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

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