The mass and gravity of Earth are used as a in comparison with other planets. choose all that apply. standard, weight, measure, distance. NEED ANSWERS ASAP

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant