Option A. A force does work on an object if a component of the force is is parallel to the displacement of the object.
<h3>Work done by force</h3>
The force applied to an object to displace it from a given point to another point is known as work done on the object.
W = Fd cosθ
where;
- f is the magnitude of applied force
- d is the displacement of the object.
- θ is the angle between the applied force and displacement.
Thus, A force does work on an object if a component of the force is is parallel to the displacement of the object.
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- Energy from the Sun that reaches the Earth
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Answer:
Magnification, m = -0.42
Explanation:
It is given that,
Height of diamond ring, h = 1.5 cm
Object distance, u = -20 cm
Radius of curvature of concave mirror, R = 30 cm
Focal length of mirror, f = R/2 = -15 cm (focal length is negative for concave mirror)
Using mirror's formula :
, f = focal length of the mirror
v = -8.57 cm
The magnification of a mirror is given by,
m = -0.42
So, the magnification of the concave mirror is 0.42. Thew negative sign shows that the image is inverted.