select the correct answer.\na waiter is carrying a tray above his head and walking at a constant velocity…
select the correct answer.\na waiter is carrying a tray above his head and walking at a constant velocity. if he applies a force of 5.0 newtons on the tray and covers a distance of 10.0 meters, how much work is being done?\na. 0 joules\nb. 2 joules\nc. -2 joules\nd. 50 joules\ne. -50 joules
Answer
Explanation:
Step1: Recall work - formula
The work - done formula is $W = F\times d\times\cos\theta$, where $W$ is work, $F$ is force, $d$ is displacement, and $\theta$ is the angle between the force and the displacement.
Step2: Determine the angle
The waiter is carrying the tray above his head and walking horizontally. The force applied by the waiter on the tray is in the vertical direction (to support the tray against gravity), and the displacement is in the horizontal direction. So, $\theta = 90^{\circ}$, and $\cos\theta=\cos90^{\circ}=0$.
Step3: Calculate work - done
Substitute $F = 5.0\ N$, $d = 10.0\ m$, and $\cos\theta = 0$ into the work - done formula: $W=F\times d\times\cos\theta=5\times10\times0 = 0\ J$.
Answer:
A. 0 joules