Several planets (jupiter, saturn, uranus) possess
nearlycircular surrounding rings, perhaps composed of material
thatfailed to form a satellite. in addition, many galaxiescontain
ring-like structures. consider a homogeneous ring ofmass m and
radius r.
a.)what gravitational attraction does it exert on a particleof
mass m located a distance x from the center of the ring alongits
axis?
b.) supposes the particle falls from rest as a result of
theattraction of the ring of matter. find an expression for
thespeed with which it passes through the center of the ring.

C. it comes from the core of the earth.

Distance covered, s = 8ft - 4ft = 4 ftinitial velocity, u = 34 ft/sthe acrobat is moving upwards and therefore, a = -g = -9.81 m/s^2 = 32.19 ft/s^2applying equation of motion; s = ut -1/2gt^2then,4 = 34t -1/2*32.19t^24 = 34t - 16.095t^2rearranging; -16.095t^2 + 34t - 4 = 0solving the quadratic equation; t = {-34 +/- sqrt [34^2 - 4(-16.)]}/2(-16.095) = 1.06 +/- 0.93 = 0.13 or 1.99the acrobat will take 0.13 seconds to be at 8 ft above the ground. additionally, once at the maximum height, the acrobat will move down and be at the same spot (that is height) after 1.99 seconds moving down.

Binary fission and mitosis