Question

Force F is applied on the upper pulley if F =30t where t is time on second

Answer 1

Answer:

Explanation:

=> Force F is applied on the upper pulley if F =30t where t is time on second

Calculation of the time when m₁ loses contact with floor:

m₁ = 4 Kg

m₂ = 1 Kg

Now, 3T₂ = F = 30t

=> T₂ = 10t ...(1)

=> 2T₂ = T₁ ...(2)

N₁ + T₁ = m₁g

=> But, according to question, N₁ = 0.

∴ T₁ = 40

=> By using equation (2), we get

2T₂ = 40

T₂ = 20

=> By placing the value of T₂ in equation (1), we get

20 = 10t

t =  2 sec

Thus, the time when m₁ loses contact with floor is 2 sec.