Apendulum loses 12 seconds at temperature 40 degree celsius and gain 4 sec at 20 degree celsius at what temperature it will show the correct time

25 degrees

Explanation:

The time period of a pendulum is given by,

t=2π  

=> Δt=2/g(Δl/2)

and we also know that,

Δl= αΔT

=> Δt= /(αΔT)

=> Δt₁/Δt₂= ΔT₁/ΔT₂

=> 12/4= (40-T)/(T-20)

=>3T- 60= 40- T

=> T= 25°

answer:

then are equal

m=2m

answer:

(v1t1 + v2t2)/(t1 + t2)

explanation:

the particle moved from p to q with a velocity of v1 let t1 be the time taken.

thus the displacement will be v1t1.

similarly from q to p the displacement will be v2t2

thus avg. velocity will be (v1t1 + v2t2)/(t1+t2)