Which of the following is true regarding how to calculate net force?

A. If forces are acting in the same direction, you can find the net force on an object by subtracting together the strengths of all the individual forces
B. If forces are acting in opposite directions, the strength of the force is found by multiplying the strength of the smaller force from the strength of the larger force
C. If forces are acting in opposite directions, the strength of the force is found by subtracting the strength of the smaller force from the strength of the larger force
D. A. If forces are acting in the same direction, you can find the net force on an object by multiplying together the strengths of all the individual forces

C

Explanation:

The net force is the total of the forces and if forces are opposing you would subtract the lesser from the greater thus giving you the remaining force.

it's c (engineer's do their work with mechanical stuff not on any living being)

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol