Flame Institute SCF 18 Near Chawla Lights Phase 7 Mohali Chandigarh 9888949978

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Flame SCF 18 Near Chawla Lights Ph-7 Mohali 9888949978

25. A rocket can go vertically upwards in earth’s atmosphere because

a) It is lighter than air

(b) Of gravitational pull of the sun

(c) It has a fan which displaces more air per unit time than the weight of the rocket

(d) Of the force exerted on the rocket by gases ejected by it

Ans. d

5/5 - (8 votes)

PrevPrevious24. A bullet mass 10 gm is fired from a gun of mass 1kg. If the recoil velocity is 5 m/s, the velocity of the muzzle is

Next26. At a certain instant of time the mass of a rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (taking g = 10 m/s ^2Next

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