Mily

For a 1.1 km radious cylinder, find the time for one revolution if "gravity" at the surface is to be 9/8m/s^2. I changed 1.1km= 1100m Then I used the equation a=v^2/r to calculate the velocity. the square root of: 1100 x 9.8= 103m/s I guess my confusion i...

Ignoring air resistance, a ball dropped from rest at altitude 250km strikes the ground with (a) 1500m/s (b) 2200m/s (c) 2800m/s I already know that is 2200m/s but don't understand why???

There are 12 balls in a bag, where n of them are white balls. If 2 balls are chosen at random from the bag without replacement, the probability of choosing at least 1 white balls is 19/33. Find n.

The rectangular coordinates of the point P are (-1,sqrt 3). If P is reflected witg respect to the x-axis, then the polar coordinates of its image are¡­??

16 ft what?? what do you mean by squad?

So why did you used the equation Vx=Vox-gt for time, instead of the equation X= -1/2gt^2 + Voxt + Xo. I used the second one because of they gave me 18.4 which is the distance traveled in the x-axes? thanks!

Never mind i just used one rev=365 days and so on to get seconds...

for time in air i got approx. .40s

Oh I see! I got the formula correct but I multiply it wrongly¡­Thanks a lot!