Page 621 - SUBSEC October 2017_Neat

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12. An object is rotated in a vertical circle 14. A geostationary satellite traces an orbit
with a constant angular velocity as shown with angular velocity ω a distance r above
s
in the diagram below. the earth’s surface. Which of the following
quantities will be the same for both the
satellite and the fixed point of the earth’s
surface?

I. Speed
II. Angular velocity
III. Angular displacement

(A) I and II only
(B) I and III only
Which of the following quantities remain (C) II and III only
constant as the object moves round its (D) I, II and III
circular path?
15. Marcia needs to find the mass of her dog
I. The tension in the string but he will not stay on the bathroom scale.
II. The acceleration of the object So first she weighs herself, getting
III. The kinetic energy of the object 47 ±1 kg. Then she stands on the balance
holding her dog and the reading becomes
(A) I and II only 64 ±1 kg. From these readings the
(B) I and III only percentage error (or uncertainty) in the
(C) II and III only mass of the dog is
(D) I, II and III (A) 1%

(B) 2%
(C) 6%
13. In a 100 m race, the winner finished in a (D) 12%
time of 9.90 s and the fourth place sprinter
finished 12 ms later. In what time did he
finish the race?
16. Which of the following CANNOT be
demonstrated in sound waves?
(A) 9.912 s
(B) 9.780 s (A) Reflection
(C) 10.002 s (B) Diffraction
(D) 10.200 s (C) Polarisation
(D) Interference

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