How do we change km/h to m/s​

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

Coal contains energy. a. light b. kinetic c. chemical d. mechanical

An object is placed in front of a concave mirror between the pole and the focus of the mirror, what is the nature of the image formed by the mirror