Answer:
3. Higher in some places and lower in other places
Answer:
The focal length is 16.86 cm and the distance of the man if he wants to form an upright image of his chin that is twice the chin's actual size is 8.43 cm.
Explanation:
Given that,
Object distance u=1.54 m =154 cm
Image distance v = 15.2 cm
Magnification = 2
We need to calculate the focal length
Using formula of mirror

Put the value into the formula



We need to calculate the focal length
Using formula of magnification

Put the value into the formula


Using formula of for focal length






Hence, The focal length is 16.86 cm and the distance of the man if he wants to form an upright image of his chin that is twice the chin's actual size is 8.43 cm.
The answer is D. The Ossicles
Answer:
it is option 3
Explanation:
because as red shift occurs when object in a space is far from us, so many of the stars we know will be seen in red shift because they are far from us by 20 years the most of the starts we see will be in red shift
Answer:
i.e.

Explanation:
Given:
angular speed,
mass of the disk, 
radius of the disk, 
mass of the chunk, 
radius of the chunk, 
We know that the angular momentum is given by:

and moment of inertia for a disc:

According to the conservation of angular momentum, the final angular momentum is equal to the initial angular momentum.



