相关知识点: 试题来源: 解析 B。功(work)的公式是 W = Fd,其中 F 是力(force),d 是位移(displacement)。A 选项没有这个公式;C 选项 W = Fv 是功率的公式;D 选项 W = F/t 也没有这个公式。本题考查功的公式对应的英语表达。反馈 收藏
More Commonly Misspelled Words Words You Always Have to Look Up Popular in Wordplay See All 8 Words with Fascinating Histories 8 Words for Lesser-Known Musical Instruments Birds Say the Darndest Things 10 Words from Taylor Swift Songs (Merriam's Version) ...
More Commonly Misspelled Words Words You Always Have to Look Up Popular in Wordplay See All 8 Words with Fascinating Histories 8 Words for Lesser-Known Musical Instruments Birds Say the Darndest Things 10 Words from Taylor Swift Songs (Merriam's Version) ...
1. How much work is done by the gravitational force when a Hint: The force and the displacement are both 265-kg object falls 2.80 m? downwards, so the angle between them is 0o .2. A 65.0-kg physics student climbs a flight of stairs 20.0 m high. Hint: The minim...
This book examines the consequences of economic instability due to job loss and the displacement of millions of workers. It draws upon case studies of worker displacement as well as national labour force surveys. Thomas S. Moore finds that consequences of economic instability are productivity ...
Learn about the concept of variable force, the work done by a variable force and the graphical interpretation force-displacement curve by visiting BYJU'S.
=fdcos θ. Work done on a body is accomplished not only by a displacement of the body as a whole from one place to another but also, for example, by compressing agas, by rotating a shaft, and even by causing invisible motions of the particles within a body by an externalmagneticforce...
Example1: A small object of mass m is suspended from a string of length of L. The object is pulled sideways by a force F that is always horizontal, until the string finally makes an angle . The displacement is accomplished at a very small m constant speed. Find the work done by...
The term ‘work’ was first introduced by Gaspard Gustave Coriolis, a mathematician from France meaning “weight lifted through a height”. In terms of physics, work is the transfer of energy from or to an object when it suffers a displacement due to the application of the force. Work has...
Work 功 Work W done on an object by a constant force F is 一個穩定的力 F 對一個物體所作的功是 ?rF = displacement along direction of F. 沿 F 方向的位移 Note: F need not be a net force. 注意:F 不需要是淨力 ? Fr = force along direction of ?r . 沿 ?r 方向的力 Example ...