A friend wants to know whether her wedding ring is made of pure gold or of a mixture of gold and silver. a)Describe an investigation to answer her question.

b)Explain what is likely to be the most significant source of error in your answer.

The density of gold is 19.3g/cm and the density of silver is 10.5g/cm

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.