A0.5m diameter sphere containing pollution monitoring equipment is dragged through the charles river at a relative velocity of 10m/s. the sphere has a specific gravity of 0.5, is fully submerged, and tethered to the towing device by a 2m cable. what is the angle the towing cable makes with the horizontal? assume the water is at 10°c.

Explanation:

from figure

taking summation of force in x direction be zero

 .....1

taking summation of force in Y direction be zero

.........2

putting T value in equation 1

.........3

Water at 10 degree C  has kinetic viscosity v = 1.3 \times 10^{-6} m^2/s

Reynold number

so for Re =  cd is 0.072

degree

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.