Final answer:
To calculate the tension in string number 1 in an Atwood machine setup, we need more details about the system, but it generally involves using Newton's second law and considering the gravitational force and the system's acceleration.
Step-by-step explanation:
To calculate the tension in string number 1, we assume that this is referencing a typical physics problem involving two masses connected by a string over a pulley in an Atwood machine setup. However, we need more information about the system, such as whether it is frictionless and if gravity is the only force acting on it. Without additional context, we cannot provide an exact numerical answer. Generally, the tension can be found by using Newton's second law of motion and considering the net forces acting on each mass. If we know the system's acceleration and the gravitational force acting on each mass, we can calculate the tension by creating a system of equations that includes the tension and the net force experienced by each mass due to their respective weights and the system's acceleration.