Answer:
D. When the box is placed in an elevator accelerating upward
Explanation:
Looking at the answer choices, we know that we want to find out how the normal force varies with the motion of the box. In all cases listed in the answer choices, there are two forces acting on the box: the normal force and the force of gravity. These two act in opposite directions: the normal force, N, in the upward direction and gravity, mg, in the downward direction. Taking the upward direction to be positive, we can express the net force on the box as N - mg.
From Newton's Second Law, this is also equal to ma, where a is the acceleration of the box (again with the upward direction being positive). For answer choices (A) and (B), the net acceleration of the box is zero, so N = mg. We can see how the acceleration of the elevator (and, hence, of the box) affects the normal force. The larger the acceleration (in the positive, i.e., upward, direction), the larger the normal force is to preserve the equality: N - mg = ma, N = ma+ mg. Answer choice (D), in which the elevator is accelerating upward, results in the greatest normal force, since in that case the magnitude of the normal force is greater than gravity by the amount ma.
45-4753that is your answer
For the given problem, the amount of work done expressed in ergs is 3200 ergs.
Answer: Option A
<u>Explanation:
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The work done on an objects are the force acting on it to move the object to a particular distance. So, work done on the object will be directly proportional to the force acting on it and the displacement.
Here, the force acting on the object is given as 0.010 N and the displacement of the object is 0.032 m. So, the work done on the object is
It is known that
So, the work done can be expressed in as,
It is known that , so the conversion of units from Nm to erg will be done as follows:
Thus, work done in ergs is 3200 ergs.
We can’t answer this because we don’t know what elements are where. if you do not conduct a photo we can’t possibly know what’s going on