terminal speed

简明释义

终速极限速率

英英释义

例句

1.Understanding terminal speed is crucial for designing safe parachutes.

理解终极速度对于设计安全的降落伞至关重要。

2.The terminal speed of a falling object depends on its mass and shape, as well as the density of the air.

下落物体的终极速度取决于其质量和形状，以及空气的密度。

3.When a skydiver jumps from an airplane, they eventually reach their terminal speed, which is the constant speed at which the force of gravity is balanced by air resistance.

当跳伞者从飞机跳下时，他们最终会达到他们的终极速度，这是重力和空气阻力平衡时的恒定速度。

4.In free fall, a parachutist experiences acceleration until they reach terminal speed, after which their descent becomes steady.

在自由下落中，跳伞者经历加速，直到他们达到终极速度，之后他们的下降变得稳定。

5.The terminal speed for a human body in a belly-to-earth position is about 53 m/s.

人类身体在腹部朝下位置的终极速度约为53米/秒。

作文

When we think about falling objects, we often imagine them accelerating towards the ground without any limit. However, this is not entirely accurate. In reality, every object falling through the atmosphere eventually reaches a point where it stops accelerating and falls at a constant speed. This phenomenon is known as terminal speed, which refers to the maximum speed an object can achieve while falling through a fluid, such as air. The concept of terminal speed is crucial for understanding various aspects of physics and engineering, especially in fields like skydiving, parachuting, and even in the design of vehicles that travel through the atmosphere.To grasp the idea of terminal speed, one must first understand the forces acting on a falling object. When an object is dropped, it is initially influenced by the force of gravity, which pulls it downward. As the object accelerates, it also encounters air resistance, a force that opposes its motion. This air resistance increases with the object's speed until it balances the gravitational force acting on the object. At this point, the net force becomes zero, and the object no longer accelerates; it has reached its terminal speed.The value of terminal speed depends on several factors, including the object's mass, shape, and the density of the fluid it is moving through. For example, a skydiver in a belly-to-earth position will have a different terminal speed compared to a skydiver in a head-down position. The increased surface area in the belly-to-earth position results in greater air resistance, leading to a lower terminal speed. Conversely, the head-down position minimizes air resistance, allowing the skydiver to reach a higher terminal speed. Typically, the terminal speed for a human skydiver in a stable position is around 120 miles per hour (193 kilometers per hour).Understanding terminal speed is not only important for recreational activities like skydiving but also for safety measures in aviation and engineering. For instance, when designing parachutes, engineers must calculate the desired terminal speed to ensure a safe landing for the user. If the terminal speed is too high, the impact upon landing could be dangerous or even fatal. Therefore, parachute designs aim to increase air resistance, effectively lowering the terminal speed to a safe level.In conclusion, the concept of terminal speed plays a vital role in our understanding of motion through fluids. It illustrates how forces interact to determine the behavior of falling objects. Whether in the context of thrilling skydiving experiences or critical engineering applications, terminal speed remains a fundamental principle in physics that helps us navigate and comprehend the complexities of motion in our world.

当我们想到下落的物体时，我们常常想象它们无止境地加速向地面坠落。然而，这并不完全准确。实际上，任何在大气中下落的物体最终都会达到一个点，在这个点上，它停止加速，以恒定的速度下落。这种现象被称为终端速度，指的是物体在流体（如空气）中下落时能够达到的最大速度。终端速度的概念对于理解物理学和工程学的各个方面至关重要，尤其是在跳伞、降落伞和甚至设计穿越大气的车辆等领域。要理解终端速度的概念，首先必须了解作用于下落物体的力。当物体被释放时，它最初受到重力的影响，重力将其向下拉。当物体加速时，它还会遇到空气阻力，这是一种反对其运动的力。随着物体速度的增加，这种空气阻力也会增加，直到它与作用于物体的重力相平衡。在这一点上，净力变为零，物体不再加速；它达到了终端速度。终端速度的值取决于多个因素，包括物体的质量、形状以及它所移动的流体的密度。例如，处于腹部朝下姿势的跳伞者与处于头朝下姿势的跳伞者的终端速度将有所不同。腹部朝下姿势增加了表面积，导致更大的空气阻力，从而使终端速度降低。相反，头朝下姿势则最小化了空气阻力，使跳伞者能够达到更高的终端速度。通常，处于稳定位置的人类跳伞者的终端速度约为每小时120英里（每小时193公里）。理解终端速度不仅对于像跳伞这样的休闲活动很重要，而且对于航空和工程中的安全措施也至关重要。例如，在设计降落伞时，工程师必须计算所需的终端速度以确保用户安全着陆。如果终端速度过高，着陆时的冲击可能是危险的甚至致命的。因此，降落伞设计旨在增加空气阻力，有效地将终端速度降低到安全水平。总之，终端速度的概念在我们理解流体中的运动中发挥着至关重要的作用。它说明了力如何相互作用以决定下落物体的行为。无论是在刺激的跳伞体验还是在关键的工程应用中，终端速度仍然是物理学中的一个基本原则，帮助我们导航和理解我们世界中运动的复杂性。