Which of the following is considered the "universal wave formula?" 1.T=1/f
2.v=fλ
3.λ=vf
4.f=vλ

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

Which feature indicates that mars resides in the inner region of the solar system

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?