8.Kara pushes her big brother on a swing at the playground. After he gets off the swing, her little brother gets on. Kara finds that it is easier to push her little brother than it was to push her big brother. What is the MOST LIKELY reason for this?* A. a smaller Mass always moves faster than a larger Mass
B. a smaller Mass always move slower than a larger Mass
C. less force is needed to move a larger Mass the same distance
D. more force is needed to move a larger Mass the same distance

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?

Examine the drawing of a molecule. each ring represents an atom of nitrogen (n). what’s the chemical formula of this substance?

What is the quantity which is measured by the area occupied below the velocity- time graph?