The focal length of a lens needed by a woman whose near point is 50cm from her eyes is 50cm.
To find the answer, we have to know about the focal length of correcting lens.
<h3>
How to find the focal length of
correcting lens?</h3>
- If x is the distance of nearest point of the defective eye and D is the least distance of distinct vision, then, the expression for focal length of the correcting lens will be,
- It is given that, the woman whose near point is 50cm from her eyes, assuming the least distance of distinct vision for a normal eye is 25cm. Thus, the focal length will be,
Thus, we can conclude that, the focal length of a lens needed by a woman whose near point is 50cm from her eyes is 50cm.
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The correct answer to the question is unbalanced .
EXPLANATION:
As per Newton's first laws of motion, we know that a body at rest will be at rest or a body moving with uniform velocity along a straight line will keep on moving with the same velocity along that line unless and until it is compelled by some external unbalanced forces acting on.
Hence, it is the unbalanced force which is responsible for creating the motion on the body.
As per the question, Anne applied some force on the toy car. It is called applied force. There is also frictional force between car and the surface which opposes the motion of the car. The toy car will move due to the net force acting on it. The net force is known as unbalanced force.
Answer:
air humidity
Explanation:
Air parcel is a blob of air which moves in the atmosphere. For stability, if the air parcel is displaced vertically then it returns to the original position.
The most important points to know of the rising air parcel are the air humidity of the air, the temperature of the air and its dew point. These are the critical information to determine the stability of the air.
The air parcel rises buoyantly as it gets warmer than the surrounding environment.
Answer:
2 m/s^2
Explanation:
from the question
v=15 m/s
t=7.5
a=?
from the first equation of motion
v=u+at
where,
v=final velocity
u=initial velocity
a=acceleration
t=time
from the question (u) will be zero because the body started at rest
v=u+at
15=(0)+a×7.5
15=7.5a
a=15/7.5
a=2 m/s^2
Answer:
v=4m/s
Explanation:
The formulas for accelerated motion are:
We can derive the formula 
from them.
We have:
And substitute:
Where in the first step of the last row we just multiplied everything by 2a. Since 
is the displacement d, we have proved that
We use then our values to calculate the final velocity when starting from rest, traveling a distance 0.002m with acceleration 
:
