Now consider the case when the two 630-Hz loud speakers are driven out of phase such that one loud speaker creates a pressure of Acos(t) just outside the speaker and the other loud speaker creates a pressure of Asin(t) just outside the other speaker. Starting again with the observer located halfway between two loudspeakers, find the intensity heard by the observer.

The particles of an ice cube at 0°c (represented by the blue circles) come in contact with the particles of juan’s hand at 37°c (represented by the orange circles). which diagram correctly represents the temperature of the two substances and the direction of heat flow?

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

The human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information