# Help with mastering physics problem 5.138: vertical rocket launch with instrument hanging inside at constant acceleration.?

Part A

Find the minimum time for this rocket to reach the sound barrier (330m/s) without breaking the inside wire.

Part B

Find the maximum vertical thrust of the rocket engines under these conditions.

Part C

How far is the rocket above the earth's surface when it breaks the sound barrier? .

Below is the recommendation and reference answer for question "Help with mastering physics problem 5.138: vertical rocket launch with instrument hanging inside at constant acceleration.?" It was collected and sorted by the editor of this site but not sure the answer is entirely accurate.

A) find the kinematic acceleration:

27.7 N = 17.3N * (9.8m/s² + a) / 9.8m/s²

a = 5.89 m/s²

and now use v = a*t

t = v / a = 330m/s / 5.89m/s² = 56.0 s ◄

B) The thrust must not only provide the kinematic acceleration but must also support the weight as well:

F = m(g + a) = 2.60e4kg * (9.8 + 5.89)m/s² = 4.08e5 N ◄

C) h = ½at² = ♂ * 5.89m/s² * (56.0s)² = 9240 m ◄

OR

h = v² / 2a = (330m/s)² / 2*5.89m/s² = 9240 m

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