When a pendulum is at the midpoint of its oscillation, hanging straight down, which statement is true?
a. both kinetic energy and potential energy are at their maximum.
b. both kinetic energy and potential energy are at their minimum.
c. kinetic energy is maximum and potential energy is minimum.
d. kinetic energy is minimum and potential energy is maximum.
e. both kinetic energy and potential energy are at intermediate values.

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Which feature of a heating curve indicates a change ofn state

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?