Why aren’t all materials magnetic? include in your response an explanation of the relationship between spinning electrons and the direction of the magnetic fields they produce in magnetic and non-magnetic materials.

Ineed asap! list 3 examples in which friction us or makes things easier in our daily life. explain the effect of friction for each. *make sure you explain the effect of friction for each example! *

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.