MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
Subhajit Chakraborty Grade: 12
        

 A table is rotating about its axis through its centre. Two equal masses are fixed at both the ends of a thread passing through a hole in the centre. The body on the table is 20cm away from the centre. What will be the rpm of the table when the body below the table will hang motionlessly??

7 years ago

Answers : (3)

Aditya Nijampurkar
16 Points
										

am not able to visulize the problem.


van u pls post a picture?

7 years ago
Subhajit Chakraborty
18 Points
										

653_13702_math.jpg

7 years ago
Vinay Arya
37 Points
										

Hi Subhajit


Let the mass of both the bodies be m


The body which is on the table is performing a circular motion of radius 20cm.


The tension in the string is equal to the centripetal force on the body placed on the table.


                                         T=m[omega)^2]R                   ...............(!)


Here R=20cm and omega is the angular velocity of the table or angular velocity of the body


The body which is hanging below the table is stationary.


Therefore, tension in the string is equal to the weight of the hanging body


                                    T=mg               ........................(2)


From equation(1) and Equation(2)


                  mg=m[omega)^2]R


       =>    g=[omega)^2]R =>omega= 7 radian/second =420 radian/minute


Hence , the body is performing 420 revolutions per minute.


As the question says that table is rotating,therefore angular velocity of the body is equal to the angular velcoty of the table.


Hence,table is making 420 revolutions per minute.


 


 


 


 

7 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete Physics Course - Class 12
  • OFFERED PRICE: R 2,600
  • View Details
Get extra R 520 off
USE CODE: CART20
  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details
Get extra R 560 off
USE CODE: CART20

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details