12. A jack in the box lid will pop open when a crank is turned on the outside of the box. If Jack pushes against the inside of the box with a force or 3.00N when the lid is closed, and the spring is compressed 10.0cm from equilibrium, what is the force constant of the spring? 13. Sam, a butcher, puts 3.0kg of chopped beef on the 1.0kg pan on his scale which has a spring constant of 400 Mm. What is the period of vibration of the pan as it comes to rest? If sam increases the amount of beef to the scale how will the period be affected