a uniform metre rule of mass 100g balances at the 40cm mark when a mass X is placed at the 10cm mark what is the value of x. pls help I don't know how to solve it

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery