Why Do Students Believe That Homework Is Useless
Why do students believe that homework is useless
Because now they focused on their cellphones.The Work Done In Lifting A 30 Kg Set Of Bricks To A Height Of 20m Is
The work done in lifting a 30 kg set of bricks to a height of 20m is We all know the FORMULA IN FINDING WORK is W = F x D Where W is work; F is force; and D is distance However, let us first discuss what work really is. When there is an object being moved by a force through a certain distance, the measure of energy transfer is what we call WORK . One of the most common units used in work is JOULES (commonly used as a unit of energy). It is the work by which 1 Newton (1N = 1 kg.m/sec^2) of force is used/expended through a distance of 1 meter (1m). Refer to the problem. It is said that the 30 kg set of bricks are to be raised in a height of 20 meters. As we see, there is no force given. But recall that force (F) is the product of mass (m) of an object and its acceleration (a) F = ma However, in the formula, (g = 9.81 m/s^2) or acceleration due to gravity is used in replacement of (a) because the object is moving upward. So now we have F = mg Thus, we have the new ...
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