DHS 2023 JC1 Physics Revision (Set B)

Name: Index Number: Class: DUNMAN HIGH SCHOOL Holiday Revision Set B Year 5 Topic LO Q1 Measurement Kinematics (c), (l) (g) / 9 Q2 Kinematics (a), (b), (c) / 8 Q3 Dynamics (a), (f), (g) / 7 Q4 Motion in a Circle (b), (e), (f) / 8 Q5 Gravitational Field (g), (h) / 5 Q6 Oscillations Work, Energy and Power (e) (c), (f), (g) / 8 Q7 Oscillations (b), (c), (f), (g) / 13 Q8 Current of Electricity (b), (f), (g), (j), (k) / 18 Total: / 76

2 @ DHS 2023 1 An army tank fires a bomb at an initial speed of 800 m s −1 at an angle of elevation of α as shown in Fig. 1.1. The bomb is released at a height 300 m above the ground of the valley. Assume air resistance is negligible. (a) Determine the minimum height, in terms of α and g, which an airplane can fly above the ground of the valley without being hit by the bomb. minimum height = ………………….. m [2] (b) Show that the horizontal distance, x, travelled by the bomb is gx 2sin640000= [2] tank α 300 m valley Fig. 1.1 800 m s-1

3 @ DHS 2023 (c) The bomb exploded after travelling the distance in (b). The spherical shockwave produced expands as shown in Fig. 1.2. The radius R of the shockwave, at time t after the explosion, is related to the energy E released and the density  of the surrounding medium according to the equation 0.2 0.2 zR E t −= where z is a constant to be determined. (i) Determine the value of z. z = ………………….. [2] (ii) If R = (80 ± 2) m at t = (0.006 ± 0.001) s , and the density  = (1.2 ± 0.1) kg m −3, calculate the energy released E, with its appropriate uncertainty. E = ……………±…….…….. J [3] Fig. 1.2

4 @ DHS 2023 2 (a) Define velocity. ………..………………………………………………………………………………...………... ………..…………………………………………………………………………………….....[1] (b) A car travels along a long flat road. The velocity -time graph representing the motion of the car is shown in Fig. 2.1 below. Fig. 2.1 (i) Assuming that the car has zero displacement at t = 0 s, find the displacement of the car at t = 11 s. displacement =..………………………….. m [2] displacement =..………………………….. m [2] 2 11 12 −18 v / m s−1 t / s 4 7

5 @ DHS 2023 (ii) Draw a well -labelled displacement-time graph for the motion of the car in Fig. 2.2 below. [3] (iii) Draw a well-labelled acceleration-time graph for the motion of the car in Fig. 2.3 below. [2] s / m t / s 2 7 11 4 a / m s −2 t / s 2 7 11 4 Fig. 2.3 Fig. 2.2

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