A bungee cord has an unstretched length of 20.0 m. When it is stretched an additional length x, it exerts a restoring force of magnitude kx. Your friend (mass 60.0 kg) stands on a bridge 50.0 m above the surface of a river. One end of the cord is tied securely to her ankle and the other end to the bridge. You promise her that when she steps off of the bridge that she will fall a maximum distance of only 45.0 m before the cord stops her. You have several types of bungee cords to select from (all with unstretched length 20.0 m), and you test them by tying one end to a tree and pulling on the other end with a force of 350 N. When you do this, what distance will the bungee cord that you should select have stretched? Please begin with a 1-2 sentence discussion of your strategy.

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

When temperature of a substance increases, of its particles increase resulting in more between particles. real world applications of thermal expansion absolute zero (-273 degrees c) is the lowest possible temperature on the kelvin scale. it is a measure of where a substance has no kinetic energy. heat is a process of the . energy flows spontaneously from a object to a until equilibrium is reached. heat is measured in heat is transferred throughis a method of heat transfer that occurs between particles of matter that are in direct contact with each other. are poor conductors that impede / reduce the rate of heat transfer. is a method of heat transfer that occurs in fluids (non-solids) by means of currents. real world application of convectiona method of heat transfer through electromagnetic waves. when energy moves from one object to another inside a closed system, no energy is or in the system in the transaction. systems will spontaneously move to a state of organized energy or high disorder over time called

The heliocentric and the geocentric models of the solar system included these central principles