# Y y a x x z y b c d x z z y x z 5 ucles 2007

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Y Y A X X Z Y B C D X Z Z Y X Z 5 © UCLES 2007 9702/01/O/N/07 [Turn over 4 A series of measurements of the acceleration of free fall g is shown in the table. Which set of results is precise but not accurate? g / m s –2 A 9.81 9.79 9.84 9.83 9.79 B 9.81 10.12 9.89 8.94 9.42 C 9.45 9.21 8.99 8.76 8.51 D 8.45 8.46 8.50 8.41 8.47 5 A mass m has acceleration a . It moves through a distance s in time t . The power used in accelerating the mass is equal to the product of force and velocity. The percentage uncertainties are 0.1 % in m , 1 % in a , 1.5 % in s , 0.5 % in t . What is the percentage uncertainty in the average power? A 2.1 % B 2.6 % C 3.1 % D 4.1 % 6 © UCLES 2007 9702/01/O/N/07 6 The diagram shows the graduations of a correctly calibrated ammeter. When the current is zero, the pointer is at 0. 0 1 2 3 4 5 The ammeter is accidentally readjusted so that when the current is zero, the pointer is at X. X 0 1 2 3 4 5 Which calibration graph best represents the response of the readjusted ammeter? A angle of deflection of pointer from the zero mark angle of deflection of pointer from the zero mark angle of deflection of pointer from the zero mark angle of deflection of pointer from the zero mark current current current current B C D 0 0 0 0 0 0 0 0 7 © UCLES 2007 9702/01/O/N/07 [Turn over 7 The symbol g represents the acceleration of free fall. Which of these statements is correct? A g is gravity. B g is reduced by air resistance. C g is the ratio weight / mass. D g is the weight of an object. 8 A particle moves along a straight line. A particular property K of the particle's motion is plotted against time. K time 0 0 At any time, the slope of the graph is the acceleration of the particle. What is the property K ? A the displacement of the particle B the distance travelled by the particle C the speed of the particle D the velocity of the particle 