An object with mass m is spinning in uniform circular motion in a circle perpendicular to the ground with radius r at a circular velocity of 2 m/s. at the height of its spin, the forces acting on it, f, can be calculated by summing the force due to change in direction and the force due to gravity. the force due to gravity is the mass of the object multiplied by 9.8 m/s2s2. the force due to change in direction is the product of the square of the velocity of the object, the mass of the object, and the reciprocal of the radius. what is m in terms of r and f? a) f. r4+9.8rf. r4+9.8rb) f4r+9.8f4r+9.8c) f. r4r+9.8f. r4r+9.8d) 4r+9.8f4r+9.8fe) (f. r)−49.8r(f

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

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)

Which statements describe the movement of ocean currents around the globe? check all that apply. strong winds force warm water to sink to the ocean floor. the coriolis effect causes warm and cold water to mix. cool dense water sinks to the ocean floor. warm water replaces cool surface water. wind blowing parallel to the shore causes upwelling of cool water.