select the correct answer.\na student lifts a set of books off a table and places them in the upper shelf of…
select the correct answer.\na student lifts a set of books off a table and places them in the upper shelf of a book - case which is 2 meters above the table. if she applies a force of 5 newtons to lift these books, what is the work done?\na. 0 joules\nb. 2.5 joules\nc. -2.5 joules\nd. 10 joules\ne. -10 joules
Answer
Explanation:
Step1: Recall work - formula
The formula for work is $W = F\times d\times\cos\theta$, where $F$ is the force, $d$ is the displacement, and $\theta$ is the angle between the force and the displacement. Here, the force is in the direction of the displacement ($\theta = 0^{\circ}$ and $\cos\theta=\cos0^{\circ}=1$), $F = 5$ N and $d = 2$ m.
Step2: Calculate work
Substitute the values into the formula: $W=F\times d\times\cos\theta=5\times2\times1 = 10$ J.
Answer:
D. 10 joules