Question

Sally slides a thin circular disc of radius'Y on a plank AB as shown below
.
She next rolls the disc on the ground beside ABC and it takes EXACTLY ONE turn to cover the length AC If the height of the triangle is same as the radius of the disc, which of the following is TRUE?
A. area of triangle > area of disc
B. area of triangle = area of disc
c. area of trianglecarea of disc
D. (Cannot compare the areas without knowing r.) pierderea CONSECUTIVE Integere
Plz answer with explanation ​

Answer 1

The answer is below you can check !!!

Step-by-step explanation:  From a thin circular disc of radius R, a circular hole of radius 4R/5 is cut as shown. The distance of the center of mass of remaining disc, from the center of the original disc is:

Correct option is A)

Total mass = M

mass of S

1

​

=

R

2

π

M

​

×π(

5

4R

​

)

2

=(

25

16

​

)M

com at Bigger disc at centre is

x

m

m(

25

a

​

)+m(

25

16

​

)

5

1

​

​

=0

x=

45

16R

​