Three identical blocks connected by ideal strings are being pulled along a horiz

Question

Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F. The magnitude of the tension in the string between blocks B and C is T = 3.00 N. Assume that each block has mass m = 0.400 kg. What is the magnitude F of the force? What is the tension TAB in the string between block A and block B? Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F. The magnitude of the tension in the string between blocks B and C is T = 3.00 N. Assume that each block has mass m = 0.400 kg. What is the magnitude F of the force? What is the magnitude F of the force? What is the tension TAB in the string between block A and block B? What is the tension TAB in the string between block A and block B?

Explanation / Answer

a = 7.5 m/s2 The key is, this acceleration is the same for blocks A B and C! Therefore, the magnitude of the force of the whole thing is F= ma F= (0.400 kg + 0.400 kg + 0.400 kg)(7.5 m/s2)
F= 9 N. b) Here is the key thing for the second part. Since 9 N is the tension for blocks A B and C, and 3 N provides tension for block C, the tension on the string between A and B is 6 N. You can also figure this out by F = (0.400 kg + 0.400 kg)(7.5 m/s2) F = 6 N PLEASE RATE :D

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