The answer is B
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Answer:
Answer C : person on an elevator going down
Explanation:
We look for a change in state of motion in order to have a net force different from zero in the system. The state of motion doesn't change in any of the examples a, b, or d. But there is a change in the state of motion in case c where initially the person and elevator where in static equilibrium, and later the elevator started going down and accelerating from zero speed to another non zero speed.
Answer:
- Newton's first law applies. An object at rest will stay that way until a force is applied.
- Any amount of effort can be applied to any amount of mass (in the ideal case). The question is not sufficiently specific.
Explanation:
A force is required to move an object because the object will stay at rest until a force is applied.
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The effort required to lift or push two masses instead of one depends on the desired effect. For the same kinetic energy, no more effort is required. For the same momentum, half the effort is required for two masses. For the same velocity, double the effort is required.
So, the recovery force of the spring is <u>2 N in the opposite direction of the pull</u>.
<h3>Introduction</h3>
Hi ! Here, I will help you about the spring recovery force. <u>The restoring force is the force that opposes the direction of the initial pull of the spring (either when the spring is pulled horizontally or vertically)</u>. The restoring force is strongly influenced by the type of spring (through the spring constant) and the length of the strain that occurs. Negative values in spring restoring force only indicate direction, not value. The equation that applies is as follows:
If the spring is pulled horizontally
With the following condition :
- F = recovery force (N)
- k = spring constant (N/m)
- = horizontal length change (m)
If the spring is pulled vertically
With the following condition :
- F = recovery force (N)
- k = spring constant (N/m)
- = vertical length change (m)
<h3>Problem Solving</h3>
We know that :
- Assume the spring is pulled horizontally
- k = spring constant = 4 N/m
- = horizontal length change = 0.5 m
What was asked :
- F = recovery force = ... N
Step by step :
<h3>Conclusion :</h3>
So, the recovery force of the spring is 2 N in the opposite direction of the pull.