Answered

At Westonci.ca, we connect you with the best answers from a community of experienced and knowledgeable individuals. Our platform connects you with professionals ready to provide precise answers to all your questions in various areas of expertise. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform.

A mover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. What was the change in the pianos energy? a. 20j b. 200j c. 2000j d. 20000

Sagot :

P.E= Mass x gravity x height   (standard gravity = 10m/s approaximately)
     = 200x10x10= 20000j (D)

Answer: d. 20000 J

Explanation:

Potential energy is the energy possessed by an object by virtue of its position.

[tex]P.E=m\times g\times h[/tex]

m= mass of object = 200 kg

g = acceleration due to gravity = [tex]10ms^{-2}[/tex]

h = height of an object

1. when h= 10 m

[tex]P.E=200\times 10ms^{-2}\times 10m=20000Joules[/tex]

2. when h= 0 m

[tex]P.E=200\times 10ms^{-2}\times 0m=0Joules[/tex]

Thus change in energy=(20000-0)Joules=20000Joules.