When you use the scientific method to solve a problem, which procedure do you
follow?
a)find something scientists say is true and then ask questions about it.
b)identify something you think is true and then set out to prove it.
c)do an experiment and then ask questions about it.
-d) identify a question, make observations, create a hypothesis, and then set up an experiment to test the hypothesis.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

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?