What is the equation for electric potential
1 answer:
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Answer:
It is real, inverted, and smaller than the object.
Explanation:
First of all, we can use the lens equation to find the location of the image:
where
q is the distance of the image from the lens
f = 15 cm is the focal length (positive for a converging lens)
p = 50 cm is the distance of the object from the lens
Solving the equation for q,
The distance of the image from the lens is positive, so we can already conclude that the image is real.
Now we can also write the magnification equation:
where are the size of the image and of the object, respectively.
Substituting p = 50 cm and q = 21.3 cm, we have
So from this relationship we observe that:
--> this means that the image is smaller than the object, and
--> this means that the image is inverted
so, the correct answer is
It is real, inverted, and smaller than the object.
Answer:
moving the boxes and the furniture up to the fifth floor.
Explanation:
The work done when moving an object up or down is equal to its change of gravitational potential energy:
where
m is the mass of the object
g is the gravitational acceleration
is the change in height of the object
We have two opposite situations:
1) when an object is moved upward, is positive, so the work done W is positive as well: this means that we need to do work in order to move the object, because we have to "win" the effect of gravity, which pulls the object downward
2) when an object is moved downward, is negative, so the work done W is negative as well: this means that we do not need to do work on the object, because it is already done by gravity, which pulls the object downward.
Therefore, more work is done when we are moving the boxes and the furniture up to the fifth floor.