The position x, in meters, of an object is given by the equation x = A + Bt + Ct

Question

The position x, in meters, of an object is given by the equation x = A + Bt + Ct^2, where t represents time is seconds. What are the SI units of B? a. m/s^2 b. m/s^3 c. m/s d. m The current definition of the standard meter of length is based on a. the distance between the earth's equator and north pole. b. the distance between the earth and the sun. c. the length of a particular object kept in France. d. the distance traveled by light in vacuum in a certain period of time. Which of the following is a vector quantity? a. Density b. Speed c. Temperature d. None of the above Vectors A and B are shown in the figure. The x- component of A + B is a. 1 b. -5 c. 4 d. -2 If A = -4i - 2j - 3k and B = j, what is A times B? a. -3j + 2k b. +3j + 4k c. +3i - 4k d. -3i + 2j A particle travels along a curved path from point A to point Bas shown. The magnitude of the displacement is a. zero b. bigger than the distance. c. equal to the distance. d. smaller than the distance. The position versus time for an object moving along the x axis is shown in the figure. The average velocity in the time interval 2 s to 8 s is a. -1.7 m/s b. -5 c. -2.5 m/s d. 0

Explanation / Answer

1. SI unit of B is m/s. So answer is c.

2. Answer is d. The current definition of the standard meter of length is based on the distance travelled by light in vacuum in a certain period of time.

3. Answer is d.

4. Answer is b. -5

5. Answer is c.

6. Answer is c.

7. Answer is a.

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