Now lets put efficiency and drag into the last question. Drag (friction) is on t

Question

Now lets put efficiency and drag into the last question. Drag (friction) is on the order of 9.7 times 10^4 N and the efficiency of a jet engine is roughly 30%. It takes an airbus roughly 75 seconds toget to its altitude and during that time it covers 17.5 km. Using the data from the previous question calculate the more realistic amount of fuel needed. A 375 g ball is placed against a compressed spring. The spring is released and projects the ball off the top of a table with at an angle of 24 degrees. The ball lands on the floor 1.25 m below the table top. The velocity of the ball just before it hit the ground was 8.6 m/s. Air friction caused 11.5 J of Work If the spring was compressed 10 cm, what is the spring constant

Explanation / Answer

2-15) Applying the energy conservation

Work done by friction = change in mechanical energy

=> -11.5 = (1/2)mv2 - mgh - (1/2)kx2

=> -11.5 = (1/2)*0.375*8.62 - 0.375*9.8*1.25 - (1/2)*k*0.12

=> k = 4.16*103 N/m

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