M=-2 the imagine equals what?
1 answer:
Answer:
Image is twice as large as the object, and inverted
Explanation:
When an object is placed in front of a mirror, the mirror produces an image.
The magnification of the image is a number telling how much the size of the image is enlarged/diminished with respect to the object.
It is given by
where
M is the magnification
y' is the size of the image
y is the size of the object
In this problem,
M = -2
This means that:
So, we can conclude the following:
- The size of the image is twice the size of the real object
- The image is also inverted, because of the presence of the negative sign in the equation
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Work needed: 720 J
Explanation:
The work needed to stretch a spring is equal to the elastic potential energy stored in the spring when it is stretched, which is given by
where
k is the spring constant
x is the stretching of the spring from the equilibrium position
In this problem, we have
E = 90 J (work done to stretch the spring)
x = 0.2 m (stretching)
Therefore, the spring constant is
Now we can find what is the work done to stretch the spring by an additional 0.4 m, that means to a total displacement of
x = 0.2 + 0.4 = 0.6 m
Substituting,
Therefore, the additional work needed is
Learn more about work:
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Answer:
there are go fella hope u understood
