Which of the following identifies the main reason Inventing the light bulb Involved a long trial and error process? A) The light bulb parts needed to be economical.
B) The light bulb parts needed to withstand heat.
C) The light bulb parts needed to withstand pressure.
D) The light bulb parts needed to be reliable.​

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

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Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.