terminal speed

简明释义

终速

英英释义

例句

1.In free fall, an object accelerates until it reaches its terminal speed (终极速度), where the force of gravity equals air resistance.

在自由落体中，物体加速直到达到其terminal speed (终极速度)，此时重力与空气阻力相等。

2.During a parachute jump, the parachute reduces the terminal speed (终极速度) significantly.

在降落伞跳跃中，降落伞显著降低了terminal speed (终极速度)。

3.When a skydiver jumps from an airplane, they reach their terminal speed (终极速度) after falling for a few seconds.

当跳伞者从飞机上跳下时，他们在几秒钟后达到他们的terminal speed (终极速度)。

4.The terminal speed (终极速度) of a raindrop is much lower than that of a skydiver.

雨滴的terminal speed (终极速度) 远低于跳伞者的。

5.The terminal speed (终极速度) of a human body in a belly-to-earth position is about 53 m/s.

人类身体在腹部朝下的位置的terminal speed (终极速度) 大约为53米/秒。

作文

Understanding the concept of terminal speed is essential in various fields, including physics, engineering, and even everyday life. Terminal speed refers to the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration. This phenomenon occurs when the force of gravity pulling the object downwards is balanced by the drag force acting upwards against it. To illustrate this concept, consider a skydiver jumping from an airplane. Initially, as the skydiver falls, they accelerate due to gravity. However, as their speed increases, so does the air resistance acting against them. Eventually, the skydiver reaches a point where the downward force of gravity equals the upward force of air resistance. At this point, the skydiver stops accelerating and continues to fall at a constant speed known as terminal speed. This speed can vary based on several factors, including the shape of the object, its mass, and the density of the medium.The terminal speed of a skydiver in a belly-to-earth position is approximately 53 m/s (around 120 mph), while in a head-down position, it can reach speeds of up to 90 m/s (approximately 200 mph). Understanding terminal speed is crucial for skydivers to ensure safe landings and to calculate the appropriate altitude for parachute deployment.Beyond skydiving, the concept of terminal speed applies to various scenarios in nature and technology. For example, raindrops falling through the atmosphere also reach a terminal speed. A small raindrop may fall slowly, while larger droplets experience greater forces and fall faster until they reach their own terminal speed. This understanding helps meteorologists predict rainfall rates and patterns.In engineering, understanding terminal speed is vital for designing vehicles and structures that interact with fluids. For instance, cars are designed to be aerodynamically efficient to minimize drag, allowing them to achieve higher speeds more safely. In the case of rockets, engineers must account for terminal speed when calculating the descent of payloads back to Earth, ensuring that they land safely without excessive impact forces.Moreover, in sports like bungee jumping or base jumping, knowledge of terminal speed is critical for safety measures. Jumpers need to know how fast they will fall to ensure that the bungee cord or parachute will deploy correctly and safely, preventing injury.In conclusion, terminal speed is a fundamental concept that plays a significant role in various disciplines. From understanding the dynamics of falling objects to ensuring safety in extreme sports, grasping the principles of terminal speed enhances our comprehension of motion in fluid environments. By studying this concept, we can better appreciate the balance of forces at play and apply this knowledge to real-world situations, making informed decisions in both scientific and practical applications.

理解终端速度的概念在物理学、工程学甚至日常生活中都是至关重要的。终端速度指的是自由下落物体最终达到的恒定速度，当其下落过程中介质的阻力阻止了进一步加速时，就会发生这种现象。当向下的重力与向上的阻力相平衡时，物体将达到终端速度。为了说明这一概念，可以考虑跳伞者从飞机上跳下的情景。最初，跳伞者因重力而下落并加速。然而，随着速度的增加，空气阻力也随之增大。最终，跳伞者达到一个点，此时向下的重力与向上的空气阻力相等。在这一点上，跳伞者停止加速，继续以恒定速度下落，这个速度被称为终端速度。这个速度可以根据多个因素变化，包括物体的形状、质量和介质的密度。在肚子朝下的姿势下，跳伞者的终端速度大约为53米/秒（约120英里/小时），而在头朝下的姿势下，速度可达90米/秒（约200英里/小时）。理解终端速度对于跳伞者确保安全着陆以及计算降落伞展开的适当高度至关重要。除了跳伞，终端速度的概念还适用于自然和技术中的各种场景。例如，降落在大气中的雨滴也会达到终端速度。小雨滴可能下落缓慢，而较大的雨滴则经历更大的力并且下落得更快，直到它们达到自己的终端速度。这种理解帮助气象学家预测降雨率和模式。在工程学中，理解终端速度对于设计与流体相互作用的车辆和结构至关重要。例如，汽车被设计为具有空气动力学效率，以最小化阻力，使其能够更安全地达到更高速度。在火箭的情况下，工程师必须在计算有效载荷返回地球的下降时考虑终端速度，确保它们安全着陆而不会受到过大的冲击力。此外，在蹦极跳或基础跳跃等运动中，了解终端速度对安全措施至关重要。跳跃者需要知道他们将以多快的速度下落，以确保蹦极绳或降落伞会正确安全地展开，防止受伤。总之，终端速度是一个基本概念，在各个学科中发挥着重要作用。从理解下落物体的动态到确保极限运动的安全，掌握终端速度的原理增强了我们对流体环境中运动的理解。通过学习这一概念，我们可以更好地欣赏作用力之间的平衡，并将这些知识应用于现实世界的情况，使我们在科学和实际应用中做出明智的决策。