Amodel airplane with a mass of 0.741kg is tethered by a wire so that it flies in a circle 30.9 m in radius. the airplane engine provides anet thrust of 0.795 n perpendicular tothe tethering wire. (a) find the torque the net thrust producesabout the center of the circle. n·m (b) find the angular acceleration of the airplane when it is inlevel flight. rad/s2 (c) find the linear acceleration of the airplane tangent to itsflight path. m/s2

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

What object a collides with object b and bounces back its final momentum is?