A robot is exploring​ Charon, the dwarf planet​ Pluto's largest moon. Gravity on Charon is 0.278 meters per second [m/s2​]. During its​ investigations, the robot picks up a small spherical rock for inspection. The rock has a diameter of 6 centimeters​ [cm] and is lifted 16 centimeters​ [cm] above the surface. The specific gravity of the rock is 10.7. The mechanism lifting the rock is powered by a 9​-volt ​[V] power supply and draws 1.09 milliamperes​ [mA] of current. It requires 13 seconds​ [s] to perform this lifting task. What is the efficiency of the​ robot?

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