A particle A of mass M1 is suspended under the ceiling by a string of length L1.Another string of length L2 has one end connected to A and the other end
connected to a particle B which has mass M2. The system is at rest under
gravity and a horizontal strike is given to particle A such that it obtains an
instantaneous speed V, find the tensions of the two strings at the instant when
the strike is applied. Assume that both strings are light.
a mechanic problem
2010-10-19 11:50 pm
回答 (1)
2010-10-20 3:41 am
✔ 最佳答案
Let T1 and T2 be the tension in the strings at the instant when the strike is applied. Since at such instant, mass M2 is still at rest. Hence,T2 = (M2)g, where g is the acceleration due to gravity
Consider mass M1, which has an instantaneous speed of V
T1 - [(M1)g + T2] = (M1).V^2/(L1)
i.e. T1 = (M1).V^2/(L1) + (M1)g + T2 = (M1).V^2/(L1) + (M1 + M2)g
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