A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.75 m. With the string hanging vertically, the object is given an initial velocity of 2.0 m/s parallel to the ground and swings upward on a circular arc. Eventually, the object comes to a momentary halt at a point where the string makes an angle with its initial vertical orientation and then swings back downward. Find the angle .
1. Transforming energy A. Energy is not lost it is just converted to less important forms B. Work into a system: positive C. Work out of a system: negative D. Work includes electric energy into and out of motors and generators E. Energy output= energy input F. Thermal energy is irreversible a. Energy isn't lost but it is less eﬃcient 2. Eﬃciency A. A. Larger the loss of energy in a system, the lower the eﬃciency a. Comes from 1. Process limitations 2. Fundamental limitations 1. 1. Energy in the body A. Energy inputs a. ATP b. Burning food transform