6. Sally makes a pendulum using a 7 cm long string attached to a 1 ball. She measures the time it takes for one back-and-forth swinging motion and repeats the
experiment with several different lengths of string. Which of the following is the
dependent variable in her experiment?

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.