Question

The function L = 0.8T2 models the relationship between L, the length in feet of a pendulum, and T, the period in seconds of the pendulum. Which value is closest to the period in seconds for a pendulum that is 30 ft long?
A) 5.4 s
B) 4.9 s
C) 6.8 s
D) 6.1 s
Please help A.S.A.P

Answer 1

L = (0.8) T^2
 
T^2 = L / 0.8
 
T = sqrt{ L / 0.8 }
 
T = sqrt{ 30 / 0.8 }
 
T = sqrt{ 37.5 }
 
T = 6.1 seconds
 
The correct answer is D) 6.1 seconds