Recent content by Rasiel

Homework Statement [/B] A man pushes on a piano with mass 190 kg ; it slides at constant velocity down a ramp that is inclined at 17.0 ∘ above the horizontal floor. Neglect any friction acting on the piano. A. Calculate the magnitude of the force applied by the man if he pushes parallel to the...

Time to Top = v0sinθ / g So I guess by the parabolic nature of projectile motion we can just double this and get: Time of Flight = 2v0sinθ / g. Then we can get Horizontal Range as follows: Δx = v0cosθt - ½gt2 Δx = v0cosθ(2v0sinθ / g) - 0 Δx = 2v02sinθcosθ / g Δx = 2v02sin(2θ) / g Thanks...

Can't seem to make any headway into the Horizontal Range and Flight Time equations, any guidance is appreciated. @gneill @Ray Vickson

I have managed to derive the Max Height equation through the following process: vy2 = v0y2 + 2ay 0 = v0y2 - 2gy : Since at the top of the trajectory vy must be 0. v0y2 = 2gy v02sin2θ = 2gy : v0sinθ is equivalent to the y-component of the velocity. MAX HEIGHT = y = v0sin2θ / 2g I think the...

This isn't exactly a homework question. It's a question about general equations regarding projectile motion. I need to strengthen my understanding of them. Didn't know where to post non-homework related help.

Could someone please assist me in deriving the following projectile motion equations from the following kinematics equations? Kinematics Equations: Δx = v0xt + ½at2 ; Δy = v0yt + ½at2 vx = v0x + at ; vy = v0y + at Δx = ½(v0x + vx)t ; Δy = ½(v0y + vy)t vx2 = v0x2 + 2aΔx ; vy2 = v0y2 + 2aΔy...

By "cutting" part, I mean the thinner portion of the blade, like the part of the sword that could slice an apple in half, and when I say the part where the wind hits the blade straight onward, I mean the area that is like the part of the sword you could crush an apple with if enough force is...

I understand that when wind hits the blades straight on it spins for the same reason a pinwheel spins when you blow straight at it. But when wind is hitting the "cutting" parts of the blade how does air foil design help there? Wouldn't the lift generated by the air foil not matter since the...