s-2
. A mass of 1 kg is suspended by a thread. It is :
(a) lifted up with acceleration of 4.9 m
(b) lowered with an acceleration of 4.9 m s-2
The ratio of the tensions in two cases is:
(A) 3:1
(B) 2:1
(C) 1:3
(D) 1:2
Answers
Explanation:
A boy is running on a circular track of diameter 14m. If the boy completes 10 revolution of that circle, then what is total displacement and total distance travelled by the boy?
Answer:3:1
Explanation:
The magnitude of tension is equal to the net force acting on the body suspended by the string and tension and the weight always act in the opposite direction so tension will be directed upward along the length of the string.
Tension developed in the string when the mass lifted up with an acceleration of 4.9m/s^2 will be T =mg + ma...(i)
Tension developed in the string when the mass lowered with an acceleration of 4.9m/s^2 will be T1 =mg−ma....(ii)
The ratio of the tension will be,
T2/ T 1 = (g−a)/ (g + a) = (9.8−4.9) /(9.8+4.9) = 1 :3
this is very simple question if any doubt then comment to me i am always ready to do it for you if i know it