12. Explain how 5 Newtons of force can move an 80Kg man. (think about rolling friction versus sliding friction, if the skateboard were not on wheels)

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o