1. which of the following is not part of john dalton's atomic theory?

a. all elements are composed of atoms.
b. all atoms of the same element have the same mass.
c. atoms contain subatomic particles.
d. a compound contains atoms of more more than one element.

2. who provided evidence for the existence of a nucleus in an atom?

a. john dalton
b. j. j thomson
c. democritus
d. ernest rutherford

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)

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?