Which of the following is the best example of a proper hypothesis?
1.i think there is no effect on hearing if you listen to loud music only three hours a day.
2.if two objects are dropped at the same height, the heavier object will hit the ground first.
3.children who wear backpacks do better academically.
4.orange popsicles taste sweeter than grape popsicles.

Asuppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer.

Iwill give brainliest if you answer right : )

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?