Answer:
Hello your question is incomplete attached below is the complete question
Your are lifting a heavy box we will consider this process for different choices of system and surroundings
Choose the box as the system of interest. What objects in the surroundings exert significant forces on this system
- The floor
- the box
- you
- none
- the earth
answer : The earth and YOU
Step-by-step explanation:
The objects that will exert significant force on this system would be the force exerted by the earth and force exerted by you
This is because the force exerted by the earth is an internal force and it can be calculated as : m*g ( mass of the object * acceleration due to gravity ) also the force exerted by you are force due to normal reaction when lifting a load