8. if the mass of a balloon is 300 kg and the lift force provided by the atmosphere is 3300 n, what
is the net force on the balloon?
toward the north, 300 n
toward the east, 360 n
upward, 360 n
downward, 300 n

Toward the north, 300 N

Explanation:

Consider the upward direction as positive and downward direction as negative.

Given:

Mass of the balloon is,

Lift force on the balloon in the upward direction is,

Take acceleration due to gravity as 10 N/kg.

Now, weight of the balloon acting downward is given as the product of its mass and acceleration due to gravity. Therefore,

Weight is,

Now, net force is given as the vector sum of both the forces.

The upward direction is the direction of North. So, the net force acting on the balloon is 300 N towards North.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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