In this study, a simple Arduino-based experiment was designed to examine the acceleration of the object during free fall and to calculate the value of “g” (acceleration due to gravity). Experimental data on the free...In this study, a simple Arduino-based experiment was designed to examine the acceleration of the object during free fall and to calculate the value of “g” (acceleration due to gravity). Experimental data on the free fall of a plastic box through the air was gathered with the help of an ultrasonic distance sensor (HC-SR04). Readings were taken at different intervals during the fall to obtain distance time curves. Acceleration during the free fall was then determined by applying the standard kinematic equations. The shape of the distance-time graphs obtained from the experimental setup was in good agreement with the predicted graphs and the calculated values of g lie within the expected range. After repeated experiments, value of gravitational acceleration was found to be 9.805 m/s2. Hardware and software prepared for the experiment are sufficient to examine movement of ordinary objects during free fall, therefore the experiment can be easily settled in a laboratory for the purpose of learning and teaching.展开更多
Over the past century,the Communist Party of China(CPC)has led hundreds of millions of farmers through five stages(rural revolution,rural construction,rural reform,rural transformation and rural revitalization)to forg...Over the past century,the Communist Party of China(CPC)has led hundreds of millions of farmers through five stages(rural revolution,rural construction,rural reform,rural transformation and rural revitalization)to forge a road of rural development with Chinese characteristics.In the course of constant exploration and innovation,the CPC has always adhered to its original aspiration and founding mission of seeking happiness for the farmers,taken liberating and developing the productive forces as the central principle,regarded coordinating urban and rural development as the action guideline,and set“achieving common prosperity”as the target direction,and accumulated valuable historical experiences in three aspects:Firstly,the CPC has emphasized the vital role and pioneering spirit of farmers,effectively mobilizing and organizing the broad participation of rural masses.Secondly,it has committed to the collective ownership of rural land and managed the relationship between farmers and land.Lastly,the CPC has remained focused on the interests of farmers,continuously advancing reform and innovation in accordance with the changing times.展开更多
文摘In this study, a simple Arduino-based experiment was designed to examine the acceleration of the object during free fall and to calculate the value of “g” (acceleration due to gravity). Experimental data on the free fall of a plastic box through the air was gathered with the help of an ultrasonic distance sensor (HC-SR04). Readings were taken at different intervals during the fall to obtain distance time curves. Acceleration during the free fall was then determined by applying the standard kinematic equations. The shape of the distance-time graphs obtained from the experimental setup was in good agreement with the predicted graphs and the calculated values of g lie within the expected range. After repeated experiments, value of gravitational acceleration was found to be 9.805 m/s2. Hardware and software prepared for the experiment are sufficient to examine movement of ordinary objects during free fall, therefore the experiment can be easily settled in a laboratory for the purpose of learning and teaching.
基金the phased results of a program entitled"Research on the Ability of Rural Grassroots Party Organizations to Lead Collective Economic Construction in the Context of Rural Revitalization"(19BD013)under the National Social Science Fundof China.
文摘Over the past century,the Communist Party of China(CPC)has led hundreds of millions of farmers through five stages(rural revolution,rural construction,rural reform,rural transformation and rural revitalization)to forge a road of rural development with Chinese characteristics.In the course of constant exploration and innovation,the CPC has always adhered to its original aspiration and founding mission of seeking happiness for the farmers,taken liberating and developing the productive forces as the central principle,regarded coordinating urban and rural development as the action guideline,and set“achieving common prosperity”as the target direction,and accumulated valuable historical experiences in three aspects:Firstly,the CPC has emphasized the vital role and pioneering spirit of farmers,effectively mobilizing and organizing the broad participation of rural masses.Secondly,it has committed to the collective ownership of rural land and managed the relationship between farmers and land.Lastly,the CPC has remained focused on the interests of farmers,continuously advancing reform and innovation in accordance with the changing times.
