Final Answer:
The reaction forces on the supports are as follows:
Support E: 80 lb upward
Support A: 80 lb upward
Support D: 40 lb upward
The internal connection forces at B and C are:
Force at B: 40 lb downward
Force at C: 40 lb upward
Step-by-step explanation:
To calculate the reaction forces and internal connection forces, we first need to understand the equilibrium of forces. Since the cylinder weighs 80 lb, supports E and A each experience an upward force of 80 lb to counteract the weight. As the cylinder is symmetrical, support D experiences half of this weight, resulting in a 40 lb upward force.
At joints B and C, the internal connection forces must balance the external forces. Considering joint B, there is a downward force of 80 lb (weight of the cylinder) and an upward force of 40 lb from support D. To maintain equilibrium, there must be an additional 40 lb downward force at B. Similarly, at joint C, the 40 lb upward force from support D is balanced by a 40 lb downward force to maintain equilibrium.
Understanding the distribution of forces in a system is crucial for analyzing structures and ensuring stability. The calculated forces help determine the support reactions and internal forces, providing valuable information for designing and assessing the structural integrity of the system.