Sound is a type of mechanical wave must have a medium through which to travel. Sound will move at different speeds when which of the following occurs
A. The sound is fully absorbed
B. The sound moves from air to water
C. The sound pitch increases
D. The sound is reflected off a surface

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?

Where should a carbon monoxide detector be mounted?

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10−21 newtons?