A "8" grams box is pushed with a force of 100 N for 1m whereas opposing force is 10 N. A) Find the net work done on the box. B)
1 answer:
Answer:
A) Wn = 90J
B) W1 = 100J
W2 = 10J
Explanation:
A) The net work done on the box is calculated by using the following formula:
(1)
F1 = 100N
F2 = 10N
d: distance on which the box is moved = 1m
You replace the values of the parameters in the equation (1):
The net work on the box is 90J
B) The total work done by each force is:
The first box does a work of 100J and the second force does a force of 10J
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The mirror is located 30 cm from the object
Explanation:
To solve the problem, we can use the magnification equation, which states that:
where
M is the magnification
y' is the size of the image
y is the size of the object
q is the distance of the image from the mirror
p is the distance of the object from the mirror
In this problem, we notice that the image formed by the mirror is erect and diminished: this means that this is a convex mirror, so the image is virtual, and this means that the image and the object are located on opposite sides of the mirror. Therefore,
(distance of the image from the object is 40 cm, but since the image is virtual, q is the negative)
The size of the image is 1/3 that of the object, so
Solving the equation for p, we find the distance between the object and the mirror:
So, the mirror is 30 cm from the object.
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