15. is found that on planet N a simple pendulum of length 1 meter has a period o

Question

15. is found that on planet N a simple pendulum of length 1 meter has a period of exactly 1 second what is the value of g on planet in m/s A. 1.67 B. 10 E. 40 C, 20 D, 30 16, An object undergoes sNM and position as a function of time is presented by the following formula: x (0.1 m) sin (ant) What is the period A. 2 s B, 1 s C. 0,5 s d, 0.18 e, TT S 17, when twirling iee ater brings her inward, her rotational inertia arma and her rotational speed A) increases decreases D) remains the same decreases, increases E) decrease decreases F) increases, increases 18. your pet hamster sits on a record player whose angular speed is 10 rad/s If he moves to a point twice as far from the center then his linear speed and his angular velicity A. remains the same, doubles B) doubles, remains the same C) halves doubles D doubles, doubles E. halves halves 19. 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-mlsls and the platform is rotating with a velocity of 10 rad/s. If he now brings the girls closer to the center of the platform (and to himself ,it is found that speed of the platform is now 40 radls. What is the new moment of inertia of the system in kg-m/s/s? D. 60 E. 100 C. 50 45 A. 20 20. which equation correctly x (m) describes this graph of a oscillating body? t(s) C. x 3cos(3) D. x (t) 3cos(mt) E. x(t) 3 mt cos (mt)

Explanation / Answer

15) t = 2pisqrt(l/g)

g = 4pi^2*l/t^2

g = 4*3.14^2*1/1 = 39.4 m/s^2

16) w = 2pi/t = 4pi

t = 0.5 s

17) rotational inertia decreases and rotational speed increases

18) v = rw = 2w double

w remains same

19) i1w1 = i2w2 conservation of angular monetum

i2 = 200*10/40 = 50 rad/s

20) w = 2pi/t = 2pi/2 = pi

x(t) = 3cos(pit)

option d is correct

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