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A rocket produces an upward thrust of 15 MN and has a weight of 8 MN.(a) Which forces will contribute to the net downward force on the rocket?(b) When in flight, the force due to air resistance is 500kN. What is the net downward force on therocket?(c) What is the resultant force on the rocket

Question

A rocket produces an upward thrust of 15 MN and has a weight of 8 MN.(a) Which forces will contribute to the net downward force on the rocket?(b) When in flight, the force due to air resistance is 500kN. What is the net downward force on therocket?(c) What is the resultant force on the rocket

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Solution

(a) The forces that will contribute to the net downward force on the rocket are the weight of the rocket and the force due to air resistance.

(b) When in flight, the force due to air resistance is 500kN or 0.5MN. The net downward force on the rocket is the sum of the weight of the rocket and the force due to air resistance. So, the net downward force is 8MN (weight) + 0.5MN (air resistance) = 8.5MN.

(c) The resultant force on the rocket is the difference between the upward thrust and the net downward force. So, the resultant force is 15MN (upward thrust) - 8.5MN (net downward force) = 6.5MN upwards.

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