Question

Good morning.
50 points,
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plz solve question no 4
with full explanations​

Answer 1

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➡️Let the system of three blocks of mass m1 , m2 and m3 move with acceleration a due to applied force F.

➡️Then acceleration is given by, a = F/(m1 + m2 + m3 ) ......................(1)

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➡️Let us find the normal force across the contact surface between m2 and m3 from the free body diagram of mass m3 as shown from figure.

➡️N = m3 a = m3 × [ F / (m1 + m2 + m3 ) ] ...................(2)

➡️Now as shown in free body diagram of mass m2 , block of mass m2 will not slip if μN ≥ m2 g

➡️hence, μ m3 × [ F / (m1 + m2 + m3 ) ] ≥ m2 g or F ≥ (m1 + m2 + m3 ) [ m2 g / ( μ m3 ) ]

OPTION 1 IS CORRECT....!!

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Answer 2

Answer:

Fresh milk is turned to curd due to production of lactic acid. Lactic acid reduces the pH of the milk....