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# Question from ocr a2 book newtonian world watch

1. The question says as follows

The upward force F on a high-altitude meteorological balloon at the Earth's surface is 1.4x10^5N. The initial acceleration of the balloon as it is released is 25ms^-2. The total mass of the filled balloon and its load is M.

b) Calculate the value of M in kg.

The answer on the book is 4.0x10^3kg.

Thanks
2. At the instant in question we know the upward force and the acceleration upwards. The weight of the balloon acts directly downwards, opposing the upward force. So by resolving the forces vertically and applying Newton's second law F=ma you can find its mass 'm'.

3. (Original post by patterson)
The question says as follows

The upward force F on a high-altitude meteorological balloon at the Earth's surface is 1.4x10^5N. The initial acceleration of the balloon as it is released is 25ms^-2. The total mass of the filled balloon and its load is M.

b) Calculate the value of M in kg.

The answer on the book is 4.0x10^3kg.

Thanks
F=ma
Upward force - Weight = ma
F-mg=ma

You need m, so rearrange for it and plug in the numbers.

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