The force an ideal spring exerts on an object is given by fx = -kx, where x measures the displacement of the object from its equilibrium (x = 0) position. if k = 60 n/m, how much work is done by this force as the object moves from x = -0.20 m to x = 0?

What happens to light waves from a star as the star moves away from earth?

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon