Boat travels through a river at a speed of 25 m/s, passing through schools and opening the soundtrack. One student measures frequency 610 Hz. Four seconds later, student measures frequency again 587 Hz if the river is a straight line 20 m wide and the speed of sound in air is 340m/s if boat is middle river. find the distance between boat with school?

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 items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element

Define the terms moral development and moral reasoning