Yobin

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The SI unit of mass, the kilogram, is currently defined A) the mass of 5.9786332 × 1026 protons. B) by the President's weight. C) as 10-22 the mass of the Earth's moon. D) as 10-24 the mass of the Earth. 1)

E) by a prototype platinum-iridium cylinder kept at the International Bureau ofWeights and Measures in Sevres, France. 2)

2) Substitute the correct prefix to the fun-word "1012-tory". A) kilo B) giga C) pico 3) Which of the following is a megawatt? A) 109 W B) 10-6 W

D) tera

E) milli

C) 106 W

3) D) 10-9 W E) 1000 W 4)

4) What is the conversion factor between km/h and m/s? A) 3.60 m/s B) 16.7 m/s C) 36.0 m/s

D) 0.278 m/s

E) 0.0278 m/s

5) The number ofsignificant figures a common ruler can measure is A) zero. B) one. C) three. D) five.

E) seven.

5)

6) When multiplying several quantities, the number of significant digits in the result must always be A) equal to the number of significant digits in the most accurate of the quantities. B) smaller than the number of significant digits in the least accurate of the quantities. C) equal to thenumber of significant digits in the least accurate of the quantities. D) larger than the number of significant digits in the most accurate of the quantities. E) equal to the average number of significant digits in the most and least accurate of the quantities. 7) Which of the following has the greatest number of significant figures? A) 000.3140 B) 3.142 C) 314.1 D) 03.1400 8) How many significantfigures are in 0.0037010? A) four B) five C) six 9) The following conversion equivalents are given: 1 kg = 1000 g 1 l = 1000 cm3 1 l = 0.0353 ft3

6)

E) 0.003142

7)

D) seven

E) eight

8)

9)

The density of a liquid is 0.30 g/cm3 . The density of the liquid, in kg/ft3 , is closest to: A) 9.3 B) 8.5 C) 6.8 D) 7.6 E) 10

1

10) The components of vector A are given asfollows:

10)

Ax = +3.9 Ay = -4 The angle measured counterclockwise from the x-axis to vector A , in degrees, is closest to: A) 224 B) 314 C) 134 D) 46 E) 136
11) The components of vectors A and B are given as follows: 11)

Ax = +5.7 Ay = -3.6

Bx = -9.8 By = -6.5

The magnitude of the vector difference B - A , is closest to: A) 5.0 B) 16 C) 250

D) 11

E) -5.0 12)

12) The magnitudeof A is 4.8. Vector A lies in the second quadrant and forms an angle of 18 degrees with the y-axis. The components, Ax and Ay, are closest to: A) Ax = +1.5, Ay = -4.6 B) Ax = -4.6, Ay = +1.5 C) Ax = -1.5, Ay = +4.6 D) Ax = -4.6, Ay = -1.5 E) Ax = +4.6, Ay = -1.5
Figure 1.1

Vectors A and B are shown. Vector C is given by C = B - A . The magnitude of vector A is 16.0 units, and the magnitue ofvector B is 7.00 units.

13) In Fig. 1.1, the magnitude of C is closest to: A) 15.5 B) 16.2 C) 9.53 2

D) 9.00

E) 17.5

13)

14) In Fig. 1.1, the angle to vector C , measured counterclockwise from the x-axis, is closest to: A) 287° B) 16.9° C) 292° D) 22.4° E) 73.1° 15) If A and B are nonzero vectors for which A × B = 0, it must follow that: A) A is parallel to B C) A × B = AB B) A × B =1 D) A × B = 0

14)

15)

16) Which of the following is an accurate statement? A) It is possible to add a scalar quantity to a vector. B) Even though two vectors have unequal magnitudes, it is possible that their vector sum is zero. C) The magnitude of a vector can be zero even though one of its components is not zero. D) Rotating a vector about an axis passing through the tip of the vectordoes not change the vector. E) The magnitude of a vector is independent of the coordinate system used. 17) What is the magnitude of the sum of the following vectors?

16)

17) E) 9.85 18)

A = i +5 j - k A) 8.43

B =4i - j - 5k C = -i + j B) 8.77 C) 3.00 D) 13.09

18) Two vectors are given as follows:

A = +4 i - 2 j - 2 k

C = -2 i -2 j - 3 k

The magnitude of A - C is closest...