00:01
Hello students, in this question the number of books in each shelf is given as 28, the mass of each book is given as 1 .4 kg, height of each book is given as 22 cm which is equal to 0 .22 m.
00:18
From this if we found out the height of center of mass from the ground, this will be equal to 0 .22 divided by 2, this will be equal to 0 .11 m.
00:38
Potential energy of the book is given by the formula mgh where m is the mass of the book, g is the acceleration due to gravity and h is the height of the center of mass from the ground.
01:07
From this equation we can say energy of shelf 1 will be equal to number of books in shelf 1 times the mass of each book which is 1 .4 into acceleration due to gravity 9 .8 into height of the book from the ground which is 0 .15 plus 0 .11.
01:38
So energy of shelf 1 will be equal to 99 .8816 joules.
01:45
Energy of shelf 2 will be equal to number of books in shelf 2 times the mass of each book times the acceleration due to gravity times the height of shelf 2 which will be 0 .38 plus 0 .15 plus 0 .11.
02:06
This will be equal to 245 .8624 joules.
02:15
Energy of shelf 3 will be equal to number of books in shelf 3 times the mass of each book times the acceleration due to gravity times the height of shelf 3 which will be 2 into 0 .38 plus 0 .15 plus 0 .11...