Based on the data thomson collected in his experiments using cathode rays, the concept of atomic structure was modified. which of the following statements about the atomic structure were validated by his cathode ray experiments? a. particles of the cathode rays are fundamental to all matter. b. in the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge. c. matter contains negative charge and by inference positive charge. d. there are subatomic size particles in an atom. e. cathode rays have mass.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The speed of light can be used to measure the

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.