Final answer:
Design the world's fastest car, carbon fiber composites would be used for the body due to their lightweight and strength, enhancing speed and gas mileage. If a metal pin and a piece of wood with the same mass are dropped into water, the wood floats due to its lower density, while the metal pin sinks unless its shape allows it to displace enough water.
Step-by-step explanation:
If you were to design the world's fastest car, the materials for constructing its body would need to be lightweight, strong, and aerodynamic. Carbon fiber composites are a common choice for high-performance vehicles because they are much lighter than steel and aluminum while still providing excellent strength and stiffness. This reduction in weight leads to better gas mileage and a higher top speed. Furthermore, the body must be designed with crumple zones using materials that can absorb impact energy to protect occupants in the event of a collision.
When you drop a metal pin and a piece of wood of the same mass into water, the likely outcome is that the wood will float while the metal pin sinks. This happens because of the principle of buoyancy. While both materials have the same mass, wood generally has a lower density than water, allowing it to displace enough water to counteract its weight and float. Conversely, metal usually has a higher density than water, which means it will not displace enough water to support its weight, causing it to sink. However, if the shape of the metal object were such that it displaces a sufficient volume of water (like a steel ship), it might float as well.