Cho dầm chịu lực như hình vẽ 1. Hệ có luôn cân bằng với mọi tải tác động không ? Vì sao? (1 điểm)
2. Anh (chị) hãy xác định phản lực liên kết tại gối tựa? Biết P = 10kN;
q = 4kN/m; Bỏ qua trọng lượng bản thân của dầm.

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

How will the system respond to a temperature increase?

Explain what will happen if decomposers were apsent from a forest ecoysystem.