1. (1 points) Which of the following has the least number of significant fgures?
ID: 1879968 • Letter: 1
Question
1. (1 points) Which of the following has the least number of significant fgures? (a) 0.009916 (b) 5.4080 101(c) 103.70 () 120.45 2. (1 points) The cover of your physics book measures 0.226 m long and 0.144 m wide. What is its area in square meters? (a) 0.032544 (b) 0.0325 (c) 0.325 (d) 0.03254 3. (1 points) A student walk 30 m east, then 50 m west, what is magnitude of his displacement from the original position? (a) S0 m; (b) 20 m; (c) 30 m; (d) O m. 4. (1 points) A race car travels a complete lap on a circular track of radius 450 m in 50.0s.The average velocity of the car is: (a) 56.5 m/s; (b) 9.00 m/s; (c) 0 m/s; (d) 18.0 m/s. 5. (1 points) A child throws a ball directly upward (as positive direction). What are the signs of the velocity and acceleration of the ball immediately after the ball leaves the child's hand? (a) both positive; (b) both negative; (c) positive velocity; (d) positive acceleration. 6. (1 points) An object is thrown vertically upward. Which of the following statements is true? (a) the greater the initial velocity, the higher it reaches (b) its travel time upward is slightly greater than its travel time downward (c) its speed on returning to its starting point is different from its initial speed (d) its velocity does not changeExplanation / Answer
Solution:
1. Option (a) 0.009916 (Ans) has 4 significant figures , rest options have 5 significant figures.
2. Area=length* Breadth
=0.226m*0.144m=0.032544 m^2 (option a)
3. Displacement=50m -30m =20 m (option b)
4. Average velocity=displacement/ time
And displacement in circular lap =0
So, Average velocity=0m/s (option c)
5. Option (c) positive velocity and negative acceleration
6. Option (a) the greater the initial velocity, the higher it reaches
Rest options are false.
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Good luck!:)
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