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# Need help on a question Watch

1. (e) The upward force on the filled balloon at the Earth’s surface is 1.3 × 105 N. The initial acceleration of the balloon as it is released is 27 m s–2. The total mass of the filled balloon and its load is M.

[2]

(ii) Calculate the value of M.

M = ...............kg

Thats the question all help is appreciated

Cheers Dizzy
2. F=ma
F being the force
A the acceleration
3. (Original post by strry-eyd)
F=ma
F being the force
A the acceleration
I tried that and the answer came out wrong.

I have tried ; 27 M = 1.3 × 105 – Mg

But the answer should be 3.5 × 103 kg but I get a different answer from that by using this method.

4. Yeah when i tried to do it i also got a different answer, is there any other details we are given?
5. Nope, I'm really confused the questions based on newtons second law. That is all I know.
6. (Original post by dizzy123)
I tried that and the answer came out wrong.

I have tried ; 27 M = 1.3 × 105 – Mg

But the answer should be 3.5 × 103 kg but I get a different answer from that by using this method.

I did the same as you and I got 3.5*10^3...

1.3*10^5 / 36.81 = M
7. Its a misleaing question really as you think that the accerleration of 27ms^-2 can be used in the equation a=f/m. However you need to take into account g=9.8ms^-2

1.3x10^5
-------------
27+9.8

=3.53x10^3

Also a little tip, when you are displaying standard form try to use the power to sign ^

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