A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle 60⁰ with ground level. But he finds the aeroplane right vertically above his position. If u is the speed of sound, speed of the plane is

Question:

Options :

(a) 2v/√3
(b) (√3/2)v
(c) v/2
(d) v

Answer :

Answer Steps :

Step 1:

Step 2:

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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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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:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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