How must the net force be acting on an object in order for the object to have a circular motion? What is this type of force called?

Four objects are being tested to see how they are affected by fluid friction. object w has a surface area of 4.5 cm2, object x has a surface area of 2.5 cm2, object y has a surface area of 6.2 cm2, and object z has a surface area of 3 cm2. which object would experience the most fluid friction?

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v