2points
which of the following best describes internal energy?
d
a. the difference between the kinetic and thermal energies of the
particles in a system
o
b. the sum of the kinetic and potential energies of the particles in a
system
c. the difference between the kinetic and potential energies of the
particles in a system
o
d. the sum of the kinetic and thermal energies of the particles in a
system

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Explain what happens at the saturation point when adding salt to water at room temperature.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.