Which of the models do you prefer to use, to increase your understanding of the world around you? Motivate! quick please!!​

Which of the following is an example of units for speed

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

You can decrease the resistance of a length of wire by