A certain nonlinear spring has a force function given by F = −ax^2−b where x is the displacement of the spring from equilibrium, a=3.0 N/m^2 and b=4.0 N. The change in elastic potential energy of the spring as it is stretched from x= 0 m to x = 2 m is:. A. 16 J
B. 12 J
C. -8 J
D. -12 J
E. -16 J

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.