A0.65 lb, 20 inch radius hula hoop is thrown forward with a velocity at the center of gravity of vg = 6 ft/s. however, the hula hoop initially has a backspin of ω = 3 rad/s. if the coefficient of kinetic friction between the hula hoop and the floor is μk = 0.5, determine the time required before the backspin stops. also determine the velocity of the center of gravity at this time. treat the hula hoop as a thin ring.

Fluids at rest possess no flow energy. a)- true b)- false

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg. k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m. k

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?