Which of the following statements is not true?
a. you are exposed to nuclear radiation every day.
b. most of the nuclear radiation to which it is exposed occurs naturally in the
environment.
c. natural nuclear radiation is called background radiation.
d. all natural radiation is at a level low enough to be safe.

What is magnetic flux? explain faraday's law of induction.

With i really need the correct answer!

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)