Recent content by lauraosborn

I am currently doing an experiment on 2xxx series AL. After solution treatment, the strength and hardness dropped. can i account it due to its micro-structure? (i explained it saying that due to the alloying elements being dissolved in the aluminum. Without the effects of the alloying elements...

c) 1200 dv/dt = -(3600 + kv) 1/(3600+kv) dv = -1/1200 dt so do i integrate the above equation to find k?

for part b) am i right if i say that -the speed is 15 when t=0 -the speed is decreasing

Homework Statement http://postimage.org/image/810vdcuvf/ Homework Equations F=ma The Attempt at a Solution for part a) i put mdv/dt = -F(brake) - kv but is lost for what to put in for part b), help?

for d) i got that k=50 but am stuck for e) again. m dv/dt = (80000-50v²)/v thus m v (dv/dx) = (80000-50v²)/v and thus 1200v (dv/dx) = (80000-50v²)/v now do i integrate this to find the answer of part e? I'm kinda lost

Homework Statement Question is here http://postimage.org/image/som50onyv/ Homework Equations F=MA The Attempt at a Solution for a) Power = force * speed for b) Force = Mass * Acceleration F = m * dv/dt for c) for maximum velocity, there must be zero drag i am...

will do, thanks a lot for your help

erm, is there a formula that links the pressure altitude to static pressure? (sorry if i sound dumb >_<)

formula i am thinking of using is True air speed, V^2= (2a^2)/(1.4-1) x [(total pressure/ static pressure)^((1.1-1)/1.4) -1] but since only total pressure of 84.2 KPa is given, i cannot get the true air speed without static pressure. and other formulas for equivalent airspeed and calibrated...

Urgent Aero question help! I can't seem to do this question without the static pressure given. Can someone show me the workings and how it is done? I can't seem to do this question without the static pressure given. Can someone show me the workings and how it is done? Question >>...

awesome, but not as dangerous as a video where a man jump out of a hot air balloon without any protection