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

Distinguish between a transverse wave and a longitudinal wave.

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?