who described atoms as having a positive nucleus with electrons that have different energies at different distances from the nucleus.

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude of vibration?

Consider the addition of an electron to the following atoms from the fourth period. Rank the atoms in order from the most negative to the least negative electron affinity values based on their electron configurations. Br, Ge, Kr

Gravity will have greater effect on an object with ... less force, more mass, less weight, or more change

Which of the following is a true statement? A. Electric fields increase in strength as you move farther from the charge, but electric forces decrease. B. Both electric fields and forces decrease in strength as the distance increases. C.

A dog (mass 12.3 kg) sits on a sled (mass 5.1 kg) that is being pushed with a force of 33 N on a flat snowy surface. If the acceleration of both is 1.5 m/s2, what is the coefficient of kinetic friction for the sled sliding on the snow?

A loop of wire is placed in a uniform magnetic field. (a) For what orientation of the loop is the magnetic flux a maximum? The plane of the loop is perpendicular to the magnetic field. The plane of the loop is parallel to the magnetic field.

Dr. Arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode.

Stephen buys a new mop he travels 3 km south and the. 4 km east and then 3km north how far does he need to go to get back. To where he started

The elements with the largest atomic radii are found in the

Students will explain, distinguish the difference between the 4 states of matter