(Fig. P455). If a horizontal force of 1.90 × 10, N is exerted on the block m in

Question

(Fig. P455). If a horizontal force of 1.90 × 10, N is exerted on the block m in the positive n, (a) use the system approach to find the accclcration of the two blocks. (b) What is the tension in the string connecting the blocks? 56. S Two blocks each of mass m are far- tened to the top of an elevator as in Fig ure P4.56. The elevator has an upward acceleration a. The strings have neg- ligible mass. (a) Find the tensions T, and T in the upper and lower strings in Figure P4.56 ternis of iM. dL and g. (b) (ompare the (Proble1556 ard7H An

Explanation / Answer

Relevant equations F = ma

T1 - 2mg = 2ma

so T1 = 2m(a + g)

F = ma for the upper mass gives T1 - T2 - mg = ma

F = ma for the lower mass gives T2 - mg = ma

So, T2 = m(a + g)

A)

T1 = 2(ma + mg) and T2 = ma + mg

b) the upper string would break first

(c)

if cable breaks a = - g

to T1 = T2 = 0

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