Help please, need awsnser ASAP!

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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.

What can you increase the strength of an electromagnet by