Please help please be correct ! Thank you. Your physics teacher is standing on a

Question

Please help please be correct ! Thank you. Your physics teacher is standing on a rotating platform with a lovely girl on each arm. The total moment of inertia of the system is 200 kg-m/s/s and the platform is rotating with a velocity of 10 rad/s. If he now brings the girls center of the Platform (and to himself), it is found that speed of the platform is now 40 rad/s. What is the now moment of inertia of the system in kg-m/s/s? 20 45 50 60 100 A siren in a police emits a sound of frequency 1600 Hz. What frequency will you hear if the police car moves away you with a speed of 30 m/s? (assume speed of sound is 340 m/s) 1740 Hz 1755 Hz 1470 Hz 1459 Hz 1650 Hz A 1000 N scaffold is 6m long. It is hanging from 2 wires at each end. A 5000 N box sits 1 m from the left end. What is the tensions in each wire? T1 = 600, T2 = 200 T1 = 4670, T2 = 2500 T1 = 1450, T2 = 720 T1 = 4670, T2 = 1330 T1 = 720, T2 = 550 Which equation correctly describes this graph of a oscillating body? x(t) = 3cos(pi t) x(t) 3cos (3 t) x(t) = 3cos(3 pi t) x(t) = 3 cos (pi t) x(t) = 3 pi t cos(pi t)

Explanation / Answer

17) The angular momentum of the system remains conserved

so

I1w1 = I2w2

200*10 = I2*40

I2 = 50 kg-m2

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