1. For the truss shown in figure 1, determine the stress in members AC and BD in Pascal.

3. 100-gram oil at 20°C and 50-gram iron at 75 °C are placed in 200-gram iron container. The increase in temperature of the container is 5°C and the specific heat of oil is 0.43 cal/g °C. What is the specific heat of the iron?

Determine the force in each member of the truss shown in (Figure 1). State if the members are in tension or compression. Take that P = 420 lb. Express your answer to three significant figures and include the appropriate units. Assume positive scalars for members in tension and negative scalars for members in compression.  Given: angle to use is 36.9 degrees, FCD = 700lb FAD =-560lb   Find:  a) Determine the force in the member BC of the truss, and state if the member is in tension or compression.  b)  Determine the force in the member AC of the truss, and state if the member is in tension or compression.  c) Determine the force in the member AB of the truss, and state if the member is in tension or compression.