Answer:
The focal length is 
The radius of curvature is 
Explanation:
From the question we are told that
The magnification of the mirror is 
The distance of the person from the mirror(the object distance ) is 
The negative sign shows that it is been placed in front of the mirror
Generally the magnification of the mirror is mathematically represented as
=> 
=> 
Generally from the lens equation we have that
=> 
=>
Generally the radius of curvature is mathematically represented as
=> 
=>
Answer:
The correct option is that (She decreases her moment of inertia, thereby increasing her angular speed.)
Explanation:
When an object is in circular motion, the vector that describes it is known as angular momentum. Angular momentum is conserved or constant when an object is spinning in a closed system and no external torques are applied to it. An example of conservation of angular momentum is seen when a woman is sitting on a spinning piano stool with her arms extended. Her angular momentum is conserved because the net torque on her is negligibly small as the friction is exerted very close to the pivot point.
When she folds her arms,her rate of spin increases greatly decreasing her moment of inertia. The work she does to pull in her arms results in an increase in rotational kinetic energy( that is, increase in her angular speed). I hope this helps, thanks!
The visible spectrum<span> is portion of the </span>electromagnetic spectrum<span> that is </span>visible <span>to the </span><span>human eye.
</span>gamma rays, <span>sound waves, </span><span>microwaves are not the part of spectrum of light, whereas color is the portion of spectrum of light.</span>
