Physics, asked by sunepla7290, 1 year ago

Hwo far from the surface of ealth doeas a rocket fired vertically witha speed if 1/4th of escape velocity go

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Answered by Anonymous
0

Velocity of the rocket, v = 5 km/s = 5 × 103 m/s

Mass of the Earth, Me = 6 × 1024 kg

Radius of the Earth, Re = 6.4 × 106 m

Height reached by rocket mass, m = h

At the surface of the Earth,

Total energy of the rocket = Kinetic energy + Potential energy

= (1/2)mv2 + (-GMem / Re)

At highest point h,

v = 0

And, Potential energy = -GMem / (Re + h)

Total energy of the rocket = 0 + [ -GMem / (Re + h) ]

= -GMem / (Re + h)

From the law of conservation of energy, we have

Total energy of the rocket at the Earth’s surface = Total energy at height h

(1/2)mv2 + (-GMem / Re) = -GMem / (Re + h)

(1/2)v2 = GMe [ (1/Re) – 1 / (Re + h) ]

= GMe[ (Re + h – Re) / Re(Re+ h) ]

(1/2)v2 = gReh / (Re + h)

Where g = GM / Re2 = 9.8 ms-2

∴ v2 (Re + h) = 2gReh

v2Re = h(2gRe – v2)

h = Rev2 / (2gRe – v2)

= 6.4 × 106 × (5 × 103)2 / [ 2 × 9.8 × 6.4 × 106 – (5 × 103)2

h = 1.6 × 106 m

Height achieved by the rocket with respect to the centre of the Earth = Re + h

= 6.4 × 106 + 1.6 × 106 = 8 × 106 m.


I hope this will help you

If not then comment me

Answered by Anonymous
3
hlooo mate ur ans....!!!!
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