Page 79 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PSPM SP015

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5. a g = 8.38 m s
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6. a g = 3.73 m s
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7. a g = 9.83 m s
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8. h = 3.37 × 10 m
9. (b) M E = 80.59 M m
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10. W = 3.79  10 N
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11. a g = 5.65 m s
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12. v = 7894 m s , T = 5094 s
GM r 3
13. v  , T  2
r GM
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14. r Jupiter = 1.71  10 m
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15. v = 3104 m s
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3
16. v = 7.55  10 m s
17. (a) Satellite moves at the same rotation as Earth. (b) Its direction is always changing.
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(c) a = 0.22 m s
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18. (a) g = 1.85  10 m s (b)  = 3.93  10 rad s
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19. (a) v = 7687 m s (b) T = 5497 s (c) a = 8.79 m s
20. T = 5181 s
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21. r = 4.2  10 m
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22. (b) r = 4.22  10 m
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23. M = 2.2  10 kg

FINAL ANSWER FOR CHAPTER 8: ROTATION OF RIGID BODY

1. Torque is the tendency of a force to produce rotation @ a measure of turning effect of a force on a body.
2. F 1 = 42.92 N, F 2 = 55.18 N
3. (b) x = 0.42L
4. (b) N A = N B = 1.5 N
5. (a) T = 1667 N (b) R = 1590 N,  = 24.8
6. T = 5231 N
7. (b) x = 0.96 m
9. (b) F = 328.13 N
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10. (b) T = 2.04  10 N (c) T decrease. 

11. (a) Two (2) conditions for equilibrium of rigid body: F  0 and   0
(c) N P = 60 N, R Q = 247.4 N (d)  = 76
12. Angular acceleration is the rate of change of angular velocity.
13. Instantaneous angular acceleration is the instantaneous rate of change of angular velocity.
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14. (a)  = –1000 rad s (b)  = 3581 rotations (c) l = 1800 m
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(d) a t = –80 m s (e) t = 2 s from  = 2000 rad s
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15. (a)  = 2 rad s (b) t = 5 s from  o = 10 rad s -1
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16. (a)  = 10.8 rad s (b)  = 1.55 rotations
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17. (a) f = 20 Hz (b)  = 40 rad s (c) v = 22 m s
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18. (a)  = 12 rad (b) a = 0.18 m s
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19. (a)  = –3.33 rad s (b)  = 3.25 revolutions
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20. (a)  = –0.698 rad s (b) N = 112.5 rev
21.  = 46.5 rotations
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22. (a)  = 125.66 rad s (b) v = 3.77 m s (c) s = 20.1 m
23. Moment of inertia of a rigid body about an axis is the sum of product of mass and the square of radius of
the rotation.
n
2
I   m i r define all symbols
i
 i 1
24. Three (3) factors which affect the moment of inertia of a rigid body is massof the body, shape and axis of
rotation. @ perpendicular (shortest) distance of the body to the axis of rotation.
25. s    s = r, v    v = r , a    a = r, F     = rF
2
26. I = 152 kg m
28. K r : K s = 10:7
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