Posted by **Leslie** on Friday, November 9, 2012 at 7:01am.

An umbrella with a diameter of 1 m turns 22 rev every 44 seconds. If it's 1.5 m from the ground, calculate the time it takes for a drop to reach the ground and the distance away from the umbrella a person should stand so as to not get wet.

For this problem I made a = (0, -g) and used the equation Vyo= 1.5 - g(t^2)/2. And made Vyo=0 so, solving for t, I got sqrt(3/g).

Then v=2pir/T,so (22x2pi)/44s = pi rev/s

so w= pi rev/s

Then, using the equation v=Rw , v = (.5m)(pi rev/s) = pi/2 m/s

After that I didn't know what to do, so if I made any errors above, please let me know. I think for finding the distance I would use the equation D = sqrt(R^2 = Xmax^2) but I don't know how I could incorporate that into the problem

Thank you

## Answer This Question

## Related Questions

- physics - a ball is thrown straight up with a speed of 8.0 m/s from a third-...
- Physics - 1.You are stuck on a cliff and want to know how far to the bottom. You...
- Physics! - A 0.3 kg brick is dropped form a height of 8 meters. It hits the ...
- Physics - A ball is thrown upwards at 15m/s from a window 20 metres above the ...
- Physics - A ball is thrown vertically upward with a speed of 1.53 m/s from a ...
- Physics - An astronaut is stranded on another planet with UNKNOWN GRAVITY. He ...
- physics 1 - An astronaut is stranded on another planet with UNKNOWN GRAVITY. He ...
- trig - A Ferris wheel has a radius of 15 meters and takes 20 seconds to complete...
- physics - A stone is projected upward at an angle of 60degree to the horizontal ...
- physics - A stone is projected upward at an angle of 60degree to the horizontal ...

More Related Questions