joshua programs a robotic arm to place a block in a box by following the sequence of commands in the…

joshua programs a robotic arm to place a block in a box by following the sequence of commands in the table.\n| step | command |\n| ---- | ---- |\n| 1 | grip block. |\n| 2 | lift block ten centimeters. |\n| 3 | hold for twenty seconds. |\n| 4 | release block. |\nduring which step does the robotic arm do work on the block?\no step 1\no step 2\no step 3\no step 4

joshua programs a robotic arm to place a block in a box by following the sequence of commands in the table.\n| step | command |\n| ---- | ---- |\n| 1 | grip block. |\n| 2 | lift block ten centimeters. |\n| 3 | hold for twenty seconds. |\n| 4 | release block. |\nduring which step does the robotic arm do work on the block?\no step 1\no step 2\no step 3\no step 4

Answer

Brief Explanations:

Work is done when a force causes a displacement in the direction of the force. In Step 1, there is no displacement. In Step 3, there is a force but no displacement. In Step 4, the block is released but no force - displacement work is done in the traditional sense. In Step 2, the robotic arm exerts an upward force to lift the block a distance of ten centimeters, so work is done.

Answer:

Step 2