So it doesnt fall in, theres no way for a circle to fall into the hole, whereas a square manhole, when tilted at the right angle, could fall in and hurt the workers underneath.
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A circular manhole cover is used because it cannot fall into the hole it covers regardless of its rotation. This design simplifies installation and removal of the cover, reduces the risk of accidents, and is more cost-effective to manufacture.
Pure physics focuses on the study of fundamental principles and laws governing the natural world, while applied physics involves using these principles to solve practical problems or develop new technologies. Pure physics aims to advance theoretical knowledge and understanding, while applied physics applies this knowledge to real-world applications in various fields such as engineering, material science, and biophysics.
Physics is the foundational science that studies the fundamental principles governing the natural world, while applied physics focuses on using those principles to develop practical solutions to real-world problems. Applied physics seeks to apply physics concepts to specific areas such as engineering, technology, and industry, aiming to create useful products and technologies.
In physics, work is defined as the force applied to an object over a distance. To make work easier, you can either increase the force applied or shorten the distance over which the force is applied. Using tools or machines can also help by amplifying the force applied or making it more efficient.
Work is zero in physics when there is no displacement of an object, meaning that no force is applied to move the object over a distance.
Work is done when a force is applied to an object and causes it to move in the direction of the force. Mathematically, work is calculated as the force applied multiplied by the distance over which the force is applied. Work is a scalar quantity measured in joules (J).