variable mass

简明释义

变质量

英英释义

例句

1.The variable mass of a balloon changes as it releases gas into the atmosphere.

气球的可变质量会随着它向大气释放气体而变化。

2.When analyzing the motion of a falling object with air resistance, we consider its variable mass due to accumulating water.

在分析一个有空气阻力的下落物体的运动时，我们考虑它的可变质量，因为它会积累水分。

3.In fluid mechanics, the variable mass of a fluid system can change due to inflow and outflow.

在流体力学中，流体系统的可变质量可能因流入和流出而变化。

4.The variable mass of the spacecraft affects its acceleration and trajectory.

可变质量的航天器影响其加速度和轨迹。

5.In rocket propulsion, the concept of variable mass is crucial as fuel is consumed during flight.

在火箭推进中，可变质量的概念至关重要，因为在飞行过程中燃料会被消耗。

作文

In the realm of physics and engineering, the concept of variable mass (可变质量) plays a crucial role in understanding the dynamics of systems where mass is not constant. This phenomenon is particularly evident in rocket propulsion, where the mass of the rocket decreases as fuel is consumed. As the rocket burns fuel, it expels gases at high speed, resulting in a change in mass over time. The principles governing variable mass systems are essential for accurately modeling and predicting the behavior of such vehicles during their flight.To illustrate the significance of variable mass in practical applications, consider the launch of a spacecraft. Initially, the spacecraft has a substantial amount of propellant, contributing to its overall mass. However, as the engines ignite and fuel is burned, the spacecraft's mass diminishes. This reduction in mass affects the thrust-to-weight ratio, which is critical for achieving lift-off. Engineers must take into account the changing mass when calculating trajectories and ensuring that the spacecraft can reach its intended orbit.Moreover, the equations of motion for variable mass systems differ from those with constant mass. The well-known Newton's second law, F = ma, must be adapted to accommodate the changing mass. The mathematical treatment involves differential equations that account for the rate of change of mass and momentum. This complexity requires a deeper understanding of calculus and physics, making the study of variable mass systems both challenging and rewarding for students and professionals alike.In addition to aerospace applications, variable mass is relevant in various fields such as fluid dynamics and mechanical engineering. For instance, in a hydraulic system, the mass of the fluid can vary depending on the operational conditions. Understanding how these changes affect pressure and flow rates is vital for designing efficient systems.Furthermore, the concept of variable mass extends beyond traditional engineering applications. In biological systems, organisms often experience changes in mass due to growth, metabolism, and environmental factors. For example, a growing plant increases in mass as it absorbs nutrients and water. Similarly, animals gain or lose weight based on their diet and activity levels. Studying these changes can provide insights into health and ecological dynamics.In conclusion, the notion of variable mass (可变质量) is integral to various scientific and engineering disciplines. It challenges conventional thinking about mass and forces, prompting engineers and scientists to develop innovative solutions to complex problems. As technology advances, the importance of understanding variable mass will only increase, paving the way for new discoveries and advancements in fields ranging from aerospace to biology. Embracing this concept allows us to better comprehend the intricate workings of our universe and the systems within it.