A plane is going towards west with a speed of 540km/h at a height of 2040m .When a person on the ground saw plane the of plane ,the sound of plane appears ti reach him reach him vertically.The dis†an ce of plane from person at that ins†an t is (speed of sound 340m/s

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Q. At t=0, an aeroplane which is vertically above a ground observer is going towards east at a speed of

510 k m / h

at a height of

2000 m

. At a certain instant, the sound of the plane heard by the ground observer appears to come from a point vertically above him. How far is the plane at this instant from where it was at t=0? Speed of the sound in air

= 340 m / s

Q. A student sees a jet plane flying from east to west. When the jet is seen just above his head the sound of Jet appears to reach him making

60^{\circ}

with the horizontal from east. If the velocity of sound is

C

, then that of the jet plane is :

Q. A supersonic jet plane moves parallel to the ground at speed v = 0.75 mach (1 mach = speed of sound). The frequency of its engine sound is

v_{o} = 2 k H z

and the height of the jet plane is h = 1.5 km. At some instant an observer on the ground hears a sound of frequency

v = 2_{o}

. Find the instant (in sec) prior to the instant of hearing when the sound wave received by the observer was emitted by the jet plane. Velocity of sound wave in the condition of observer = 340 m/s.

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u

towards a bicycle moving away from him with speed

v

. The person approaches his image in the plane mirror fixed at the bicycle with a speed of :

A person runs with a speed u towards a bicycle moving away from him at the speed v. The person approaches his image in the plane mirror fixed at the rear of the bicycle with a speed of:

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