Make sure you have a pen and paper to make sketches and a calculator at hand whe

Question

Make sure you have a pen and paper to make sketches and a calculator at hand when taking the quiz. If you have question, email This test has a time limit of 1 hour and 30 minutes. This test will save and submit automatically when the lime expires Warnings appear when half the time, 5 minutes 1 minute, and 30 seconds remain This allows 3 attempts. This is attempt number 1. Once started this test must be completed in one sitting Do not leave the test before doing Save and Submit A simple pendulum 2.0 m in length, is released with a push when the support sting is at an angle of 25 degree from the If the speed of the suspended mass is 1.2 m/s when at the its speed at the bottom of the swing a. 0.5 m/s b. 2.6 m/s c 2.3 m/s d. 2.0 m/s

Explanation / Answer

according to the conservation of energy

(K + U) 1 = K2

1/2m*v1^2 + m*g*h = 1/2*v2^2

here h = L - Lcos theta ) = L*(1 - cos(25)) = 2.0m*(1 - cos(25)) = 0.1874m

so v2 = sqrt(v1^2 + 9.8*0.1874) = sqrt(1.2^2 + 2*9.8*0.1874) = 2.3 m/s

ANS: ( a)

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