General Physics> CONCEPT And APPLICATION OF NEWTON’S LAW O...

A balloon of mass M is descending vertically with acceleration a. How much weight must be thrown from the case attached to the balloon so that it begins to ascend vertically with acceleration a?

Asume that the upward lift of the air in the balloon does not change.

Simran Bhatia , 12 Years ago

Grade 11

5 Answers

Navjyot Kalra

Take upward direction to be the positive y-direction. If m is the mass thrown out, then the equation of motion for before and after the mass m is thrown out are

Ma = F – Mg

(M–m)a = F – (M–m)g

Solving the two equations m =2ma/(a+g)

Last Activity: 12 Years ago

Neelabh

Consider the balloon to move along y axis. The balloon`s mass is mThen, when it is descending,ma=F-mgAfter removing mass m`, the balloon ascends, then(m-m`)a=F-mgSolve the equations, then m`=2ma/a+g

Last Activity: 8 Years ago

Neelabh

Consider the balloon to move along y axis. The balloon`s mass is mThen, when it is descending,. ma=mg-F. After removing mass m`, the balloon ascends, then. (m-m`)a=F-(m-m`)g. Solve the equations, then m`=2ma/a+g

Last Activity: 8 Years ago

Faisal mansoor

Let M= Mass of balloon initially

m= Mass removed

a= Acceleration (a

g= acceleration due to gravity

F=FORCE acting in upward direction due to air in balloon (air resistance)

Solution:-

Mg- F= Ma (since balloon's motion is in downward direction)-------------(1)

F -(M-m)g =(M-m)a (since, balloon's motion is in upward direction)-----------------(2)

Put the value of F from equation (2) in (1) and you'll get the value of mass 'm' that has been removed from the balloon.

i.e. m(mass removed)= 2Ma/g+a

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Hope it helps!

Last Activity: 7 Years ago

Yash Chourasiya

Dear Student
Let Fbe the upthrust of air in either case
In (i) case,Mg − F = Ma …(i)
In (ii) caseF − (M−m)g = (M−m)a …(ii)

From Equation (i) and (ii)
(Mg−Mg) − Mg + mg = Ma − ma
orm(g+a) = 2Ma
m = 2Ma/(g+a)

I hope this answer will help you.
Thanks & Regards
Yash Chourasiya

Last Activity: 5 Years ago