Practice_Test_1_Answers - 1 Solutions to Practice Test 1 1...

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1 Solutions to Practice Test 1 1. If mass is measured in kg, length in m and time in s, what is the unit of ? mass area c. kg/m 2 2. If x is measured in ms -1 and y measured in s, what is the unit of x/y? 1 2 x ms ms y s - - = = a. ms -2 3. If the radius of a sphere is 1.20 cm, what is its volume in m 3 ? 3 3 6 2 4 4 (0.012 m) 7.24 10 m 3 3 v r π π - = = = × d. 7.24 × 10 -6 4. If the mass of a substance is 1.2 × 10 6 kg and its volume is 7.3 x 10 -2 m 3 , what is the mass per unit volume of the substance? 6 7 -3 2 3 1.2 10 kg 1.6 10 kg.m 7.3 10 m mass volume - × = = × × c. 1.6 x 10 7 5. Which of the following is a vector quantity? a. velocity 6. A moving object is at x = -5.0 m and at x = -1 at t = 2.0 s. What is the displacement of the object? Displacement = x 2 – x 1 = -1 – (-5) = -1 + 5 = 4.0 m d. 4.0 m
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2 7. What is the velocity of the object in question 6 above? -1 displcement 4.0 Average velocity = 2.0 ms time 2.0 m s = = c. 2.0 m.s -1 8. What is the direction of motion of the object in question 6 above? Since the velocity is positive, the object is moving to the right. d. right 9. Which of the following statements is NOT true of velocity? d. Velocity is the same as speed 10. The position function of a moving object is given by x = -5t + 10. which of the following is true about the velocity of this moving object? Velocity is the rate of change of the position function. A graph of position against time will be a straight line and its slope will be -5, the uniform velocity. c. The velocity remains a constant 11. What is the direction of motion of the object in question 10? Since the velocity is negative in the x-direction, the object is moving to the left. d. left 12. What is the speed of the object in question 10? Speed is the magnitude of the velocity which is 5 ms -1 . b. 5 m.s -1
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3 13. Which of the following is NOT true for an object that moves with uniform velocity? An object that moves with uniform velocity has no acceleration and so statement d is not correct. d. Its acceleration is also a constant 14. Which of the following is true of an object that travels with uniform acceleration? b. A graph of its velocity against time will be a straight line. 15. Which of the following is the correct graph of displacement against time for uniformly accelerating object? For a uniformly accelerating object the graph of position against time will be concave up. displacement time (a) 16. Which of the following is the graph of velocity against time for an object moving with uniform acceleration? Uniform acceleration is the slope of velocity-time graph. (b) velocity time
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4 17. Which of the following is the correct graph for acceleration against time for a freely falling object? Acceleration of a freely falling object is a constant and is equal to -9.8 ms -2 . (c) acceleration time -9.8 18. A bullet is fired vertically upward with a velocity of 300 ms -1 . How high did the bullet rise?
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