A bullet emerges from a barrel of length 1.2m with a speed of 640 m/s^-1. Assuming constant acceleration, the approximate time that spends in the barrel after the gun fired is

Question:

Options :

(a) 4 ms
(b) 40 ms
(c) 400 µs
(d) 1 s

Answer :

(a) 4 ms

Answer Steps :

step 1

step 2

step 3

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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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