If an element has 7 electrons how many of them will be in the 2nd energy level

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?

Substances that assume the shape of their container, but do not have a definite size are called

Whithin which type of system is neither the total mass nor the total energy conserved ? a. open b. connected c. isolated d. closed