Other examples of transverse waves include light waves and water waves. Both types of seismic wave can be detected near the earthquake centre but only P-waves can be detected on the other side of the Earth. This is because P-waves can travel through solids and liquids whereas S-waves can only travel through solids. This means the liquid part of the core blocks the passage of S-waves.
Have your vehicle's exhaust system inspected periodically to keep your car safe. Loose, missing or damaged hangers or brackets can allow the exhaust system to shift around, causing a possible clunking or rubbing sound while driving. A loose exhaust system, when hot, can also melt wiring, nylon lines or rubber hoses.
Interference with mechanical operation of the pump is another common cause of sump pump failure. Sump pits with gravel bottoms are susceptible to this. Figure 4 shows a rock jammed in a sump pump impeller, causing sump pump failure and a water loss. Interference of the float switch also can cause sump pump failure.igure 3 is a view of a sump pump plug that was connected to an extension cord. Rust patterns on the plug suggest that the connection was occasionally under water which caused the circuit breaker to trip and sump pump failure, an improper installation. It is not recommended to attach extension cords to sump pumps.