You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Reynold's Number

A rocket has ...

Question

A rocket has a mass of 100 kg. $90 %$ of this is fuel. It ejects fuel vapours at therate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

Zero

No worries! We‘ve got your back. Try BYJU‘S free classes today!

500 N

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

1000 N

No worries! We‘ve got your back. Try BYJU‘S free classes today!

2000 N

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B
500 N

Up thrust force $F = u [\frac{d m}{d t}] = 500 \times 1 = 500 N$

Suggest Corrections

Similar questions

Q. A rocket has a mass of

100 k g

90

%of this is fuel. It ejects fuel vapours at the rate of

1

kg/sec with a velocity of

500 m / s e c

relative to the rocket. It is supposed that the rocket is outside the gravitational field.The initial upthrust on the rocket when it just starts moving upwards is (in

N

)

Q. A rocket of mass

m

is fired vertically upward and after the fuel burning it weighs

m^{'}

. Ejection of fuel gas is at a constant rate of

m_{0}

per second with a constant velocity of

u_{r e l}

relative to the rocket. Final speed of rocket after the complete burn out of the fuel is given by

v =

Q. In a rocket, fuel burns at the rate of

1 k g / s

. This fuel is ejected from the rocket with a velocity of

60 k m / s

. Force exerted on the rocket in

N

is:

In a rocket, fuel burns at the rate of ${1 k g s}^{- 1}$ . This fuel is ejected from the rocket with the velocity of ${60 k m s}^{- 1}$ . This exerts a force, in newton, on the rocket of:

Q. A rocket, with an initial mass of 1000 kg, is launched vertically upwards from rest under gravity. The rocket burns fuel at the rate of 10 kg per second. The burnt matter is ejected vertically downwards with a speed of

2000 m / s

relative to the rocket. Find the velocity of the rocket after 1 min of start.

Join BYJU'S Learning Program

A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at therate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

The correct option is B 500 N Up thrust force F=u[dmdt]=500×1=500N

A rocket has a mass of 100 kg. $90 %$ of this is fuel. It ejects fuel vapours at therate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

The correct option is B
500 N

Up thrust force $F = u [\frac{d m}{d t}] = 500 \times 1 = 500 N$