- #1
kritzy
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Homework Statement
Early test flights for the space shuttle used a "glider" (mass of 940 kg including pilot). After a horizontal launch at 470 km/h at a height of 4000 m, the glider eventually landed at a speed of 210 km/h . What would its landing speed have been in the absence of air resistance(in km/h)? What was the average force of air resistance exerted on it if it came in at a constant glide angle of 15 degrees to the Earth's surface?
Homework Equations
Ki + Ui = Kf + Uf
.5mv[tex]^{2}[/tex]+mgh=.5mv[tex]^{2}[/tex]
The Attempt at a Solution
I'm not so sure about the second question but here's what I did for the first one.
I changed the units so that the answer would be in km/h.
g=35.28 km/h
h=4 km
v[tex]^{2}[/tex]=[2(.5mv[tex]^{2}[/tex]+mgh)]/m
v[tex]^{2}[/tex]=[2(.5(940)(470)[tex]^{2}[/tex]+(940)(35.28)(4)]=221182.24
v=470km/h
Unfortunately, this answer is incorrect. Any help would be greatly appreciated.