Which of these is not part of the solar system? black holes, planets, stars, astroids

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?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

What are some properties of transverse waves?