What is the difference between am radio waves and fm radio waves? a-am waves travel short distances along the earth’s surface; fm waves travel farther. b-an am wave varies in amplitude; an fm wave varies in frequency. c-fm waves are better reflected by particles in the earth’s atmosphere. d-an fm wave varies in amplitude; an am wave varies in frequency.

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)

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and

What is the coefficient of kinetic friction μk between the block and the tabletop?