This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
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4. One factor affecting the rate of diffusion of gases is temperature. Higher temperatures increase the kinetic energy of gas particles, leading to a faster rate of diffusion. Another factor is the molecular mass of the gas; lighter gases diffuse faster than heavier gases. 5. Step 1: Describe the initial state of the alarm. The fire alarm circuit is initially open because the mercury in the tube is below terminal X, preventing current flow. The bell is off. Step 2: Explain the effect of heat on the mercury. When a fire occurs, the surrounding temperature rises. Mercury is a liquid metal that expands significantly with an increase in temperature. Step 3: Describe how the circuit is completed. As the mercury expands due to heat, its level rises in the tube. When the mercury reaches and touches terminal X, it completes the electrical circuit. Step 4: Explain the final action of the alarm. With the circuit closed, current flows from the power source through the mercury, terminal X, and to the bell. This causes the bell to ring, sounding the alarm. 6. The question for Figure 5 is incomplete. It shows two identical containers, A with floating ice in water and B with hot water. To provide a full answer, the specific question about these containers is needed. That's 2 down. 3 left today — send the next one.