Which of the following provides an example of sound waves being reflected? A. Hearing music being played by a neighbors stereo through a wall
B. The sound of a distant train getting louder as it approaches an observer
C. A noise that produces an echo when it bounces off a distant wall
D. Water in a glass vibrating because of the sound of thunder

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

because if the tool that you are using is not balanced it there would be false mass.

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it