You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7 m room. how much work do you do on the bag in the process?

0 J

Explanation:

Hello,

In this case, as the person is holding the bag and the movement is carried out horizontally, the work is defined via:

Whereas accounts for the work, for the force, for the angle between the direction of the movement and the direction of the displacement and for the displacement magnitude. Considering the above mentioned, one sees that the force is exerted vertically and the movement is carried out horizontally, in such a way, the angle between them is 90° which implies that the work is null since the cosine of 90° is zero no matter the magnitude of neither nor as shown below:

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most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).