It is <span>C. Low to moderate level of exertion can be sustained over long periods of time </span>
You haven't told us the "wattage" rating of the bulb. We'll just have to call it ' W ' .
The bulb uses energy at the rate of W watts, or 0.001W kilowatts.
In 12 hours, it uses <em>0.012W kilowatt-hours </em>of energy.
= = = = =
W watts = W Joules/second
1 hour = 3600 seconds
12 hours = (12 x 3600) seconds
Energy = (W Joule/sec) x (12 x 3600 sec)
<em>Energy = 43,200W Joules</em>
So, <u>their net force on the cart is 10 N to the right</u>.
<h3>Introduction</h3>
Hi ! Here, I will help you with the net forces (results of forces) acting on a two-dimensional area and in opposite directions. Steps that can be taken are as follows :
- Determine where the force will go, the important thing is that you are consistent until the end.
- Count the values of the force acting, the force against the direction of your mind in number 1 is given a negative sign.
- Look at the results, if it's marked (-), then choose the opposite direction from your thoughts at number 1.
The equation for calculating the net force from this two-dimensional straight line is as follows:

With the following condition :
= net force (N)
= first force and its direction (N)
= second force and its direction (N)
= You can add up the force values as many times as the question (N).
<h3>Problem Solving</h3>
We know that :
In my mind, I determined that the force will go to the right. So :
= Jose's force = 12 N >> Because he already walk to the right.
= Lucy's force = 5 N >> Because she already walk to the right.
= John's force = -7 N >> Because he is walked to the left.
What was asked :
= net force = ... N
Step by step :




<h3>Conclusion</h3>
The movement of the cart is to the right because the net force value that I calculated is not opposite (with negative sign) to the right direction. So, their net force on the cart is 10 N to the right.