Which of the following statements are true? Check all that apply. Check all that apply. The speed of sound is constant. The pitch of a sound is determined by its frequency. The loudness of a sound is related it its amplitude. Sound is a transverse wave. Sound can travel through a vacuum.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

The heliocentric and the geocentric models of the solar system included these central principles

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)