joscrist3
contestada

Which statements describe a situation in which work is being done? Check all that apply.
A mover carries a box up a flight of stairs.

A mover carries a box across a room.

Wind blows against a steel table anchored to the ground.

Wind blows a pool chair across the yard.

A weightlifter lifts a barbell off the ground.

A weightlifter holds a barbell above the head.

Respuesta :

ShyzaSling

The work is being done in following cases:

A mover carries a box up a flight of stairs.

A mover carries a box across a room.

Wind blows a pool chair across the yard.

A weightlifter lifts a barbell off the ground.

These are the only cases in which work is being done. The Formula of Work is:

Work= Force applied x Distance moved.

In all of these cases force is being applied and the object on which the force is being applied move in a horizontal or Vertical direction.  Thus Work is done !

The work is only considered being done when displacement of the object occur. Therefore, the work is being done in Option A, B, D and E because object is displacing.

Work:

Work is the energy transfer by applying force to displace an object. The displacement can be horizontal or vertical. The formula of the work is,

W =  F.s

where,

F -  force

s - displacement

Hence,

  • Holding a barbell above head cannot be considered as work because displacement does not occur.
  • The work is not done when wind blows against a steel table anchored to the ground.

So, in following cases work is being done,

  1. When A mover carries a box up a flight of stairs.
  2. A mover carries a box across a room.
  3. Wind blows a pool chair across the yard.
  4. A weightlifter lifts a barbell off the ground.

To know more about work, refer to the link:

https://brainly.com/question/25064916

                                         

Otras preguntas