Need the answers to 63 and 64. I can\'t figure them out. 061 (part 1 of 4) 10.0

Question

Need the answers to 63 and 64. I can't figure them out.

061 (part 1 of 4) 10.0 points Two blocks on a frictionless horizontal surface are connected by a light string. The acceleration of gravity is 9.8 m/s2 49.4 N Kg21 kg Find the acceleration of the system. Answer in units of m/s'2. 062 (part 2 of 4) 10.0 points What is the tension in the string between the blocks? Answer in units of N 063 (part 3 of 4) 10.0 points If the surface were frictional, and the coef- ficient of kinetic friction between each block and the surface is 0.0848, what would be the

Explanation / Answer

1)

acceleration of the system = (49.4)/(21 + 4.32)

acceleration of the system = 1.95 m/s^2

2)

if there is no friction then

tension in the string = 49.5 - 21*1.95 = 8.55 N

3)

now friction force = 0.0848*(21 + 4.32)*9.8 = 21.04 N

Net force on system = 49.4 - 21.04 = 28.36

now new acceleration = 28.36/(21 + 4.32) = 1.12 m/s^2

4)

tension in the string = 28.36 - 21*1.12 = 4.84 N

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