Recent content by spaceshipone

A car has a maximum constant acceleration of 10 ft/s^2 and a maximum constant deceleration of 15 ft/s^2. determine the minimum amount of time it would take to drive one mile assuming the car starts and ends at rest and never exceeds the speed limit 55 mi/hr. Why do you need to know the...

That problem is close but different. It looks like that if for something being thrown up with air resistance and they are solving for max height it will reach. My problem is as follows: A sky diver with a mass of 75 kg jumps from an aircraft. The aerodynamic drag force acting on the sky...

I think the solution if you want to find time it took to travel say 100 meters will involve the chain rule (dx/dt)(dt/dv) or something like that, but I'm not sure how to incorporate that.

Everything you guys said makes sense, but what are the limits for the separable integrals? If you want to find the time if takes after 100 m of free fall, what do you for for the limits for the left side dv and right side dt?

I don't understand. The force for this problem isn't constant. It varies as the direction changes.

Hi, Thanks for all the replies. If I used the dot product here is what I've come up with W = F dot dr so W = fs dot <.4 , 0> W = <40(l - .2), angle 221.4 degrees> dot <0 ,0.4> So I'm not sure where to go from here. I know the distance part is straightforward. It's just straight up. The force...

I would think you'd need to at least know the modulus E of the material to find the max allowable stress?

I've been trying for a while to solve this problem http://www.flickr.com/photos/36633646@N03/3379407472/ Do I just find the total force the spring exerts from 400mm to 0 and multiply it by distance b?