When you stretch a spring 20 cm past its natural length, it exerts a force of 8 N. What is the spring constant of this spring? A. 1.5 N/cm
B. 0.4 N/cm
C. 25 N/cm
D. 160 N/cm

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

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

The receptor cells that convert light energy into neural signals are called