Hi All,
I was just wondering why some galaxies look spiral (e.g. the milky way, andromeda, etc)? Is there a proven explanation for this? Also, it would be interesting to hear your thoughts/opinions..
Thanks! :)
I am trying to find out the equation for a curve:
http://shandeepthi.blogspot.co.uk/2012/05/target-curve.html
I have tried some equations e.g.
http://shandeepthi.blogspot.co.uk/2012/05/trials.html
However, I cannot get it sufficiently accurate.
Can you please help? At least a pointer...
Is this really feasible? http://www.indianexpress.com/video/national/6/a-power-plant-running-on-gravity/7117
and if so, can anyone please explain to me how?
Sorry a mistake- I mean they (-vely cambered and flat airfoils) don't generate lift when they are in line with the airflow.
It's easy to visualize linear airflow over an aerofoil or wing tip. It follows the shape of the body it is flowing over..
I don't think there is a universally agreed explanation for lift generation but here's one as you wanted:
Google lift curve slope. You can see from there that only airfoils with a positive camber (not flat nor negatively cambered ones) generate lift under normal conditions.
This is because...
Assuming a rigid and light rope
since it's near horizontal m*v^2/r=100 --> v≈2.82m/s ----> B) 13.5rpm
(The ball has a vertical acceleration downwards of g-4sin(alpha). Since it's near-horizontal, alpha is approx 0, therefore sin(alpha)≈0 --> downward acceleration ≈ g)
Waves transmit energy. So when this energy is intercepted by a barrier (variable depending on the type of wave), the energy is transmitted to the molecules of the barrier which as a result move faster. Hence since their average Kinetic energy increases, shouldn't the Temperature of the barrier...
What happens at -273 oC?
(everything under 1atm)
I know about the cooling curve but just wondering what would happen to substances at absolute zero- does the temperature keep reducing/get harder?
Also, how do gases stay in gaseous form in outer space?
Many thanks in advance! :)