Final answer:
The tension in a cord of an ideal pulley system supporting a mass is equal to the weight of that mass. For a 115 kg mass, the tension would be 1127 N.
Step-by-step explanation:
To determine the tension in the cord when the masses are released and a pulley system is involved, we need to consider the forces acting on the system. Specifically, for an ideal frictionless pulley supporting a mass, the tension in the cord will be equal to the weight of the mass, since there's no other force acting in the opposite direction and no friction in the pulley that could change the tension.
For example, if we have a car engine with a mass of 115 kg, using an ideal pulley, the tension T in the rope would simply be the weight of the engine, which is calculated by multiplying the mass m by the acceleration due to gravity g (approximately 9.8 m/s2). So, T = m * g = 115 kg * 9.8 m/s2 = 1127 N. Thus, the tension in the cord is 1127 N.