Billy bob and bob bob are standing on a plank that is 9.0 m long and has mass 100 kg, that has supports at the 2 m and 5 m marks. billy bob has mass 50 kg and is standing on the far left side, while bob bob has mass 90 kg and is walking toward the far right side. will he make it all the way to the end without tipping the plank?

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

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)