I. In mechanics, physicists use three basic quantities to derive additional quan

Question

I. In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two? a. length and force b. power and force c. length and time d. force and time Which formula is dimensionally consistent with an expression yielding a value for velocity? (a is acceleration, x is distance, and is time) b. vr d. at 3. Which expression is dimensionally consistent with an expression that would yield a value for time? (vis velocity, x is distance, and is time) a. 4. If the displacement of an object, x, is related to velocity, v, according to the relation x = Av , the constant, A, has the dimension of which of the following? a. acceleration b. length c. time d. area 5. If a is acceleration, v is velocity, x is position, and is time, then which equation is not dimensionally correct? a, t=x/v c, v=a/t 6. Suppose an equation relating position, x, to time, , is given by x-bcr, where b and c are constants. The dimensions of b and c are respectively: a. T3, T b. IT, 1/T c. LIT,LIT . Which one of the choices below represents the preferred practice regarding significant figures when multiplying the following: 10.5 x 8.8 x 3.14? a. 290 b. 290.136 c. 290. d. 300

Explanation / Answer

1. c - length and time

2. d - at

3. a - v/x

4. c - time

5. c - v = a/t

6. c

7. a

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