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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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.