How many criteria determine if a naturally occurring object is "magnetic"?

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

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

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47