Question 5 of 5 singi tha question was wnitten by Sean Cordry at Walters State C

Question

Question 5 of 5 singi tha question was wnitten by Sean Cordry at Walters State Community College Map o sapling leamng After ten tire of it. So she bought a rocket pack. (The mass of Brenda and her rocket pack is 70.0 kg. of a two-hour commute, Brenda has gotten sick and Answer the three questions below using three | significant figures. (Let g = 9.81 m/s2) Part A: How much upward force must the rocket provide in order for Brenda to hover motionless in the air? Number FR 687 Part B: If the upward force from the rocket were equal to FR Brenda's upward accleratin? 1030 N, what is Number a= m/s Part C. In order to be safe when she is landing at the end of her commute, her downward acceleration must be a -0.400 m/s2. How much thrust doest the rocket need to supply in order to achieve such an acceleration O Previous O Next "Save And Exit Previous Next Save And Exit

Explanation / Answer

Part (a) Fup = mg = 70 x 9.81 = 686.7 N

Part (b) acceleration = net force / mass

net force = Fup - mg

a = 1030 - 686.7 / 70

a = 4.9 m/s^2

Part (c) again a = net F / m

.4 = mg - Fup / 70 ("-" sign of acceleration is only because motion is in downwards direction)

.4 = (70 x 9.81) - Fup / 70

.4 = 686.7 - Fup / 70

Fup = 658.7 N

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