1. The
measured length of a cylindrical laser beam is 12.1 meters, its measured
diameter is 0.00121 meters, and its measured intensity is 1.21 ´ 105 W/m2. Which
of these measurements is the most precise?
A. length
B. diameter
C. intensity
D. All three are equally precise.
B. diameter
C. intensity
D. All three are equally precise.
2. Vectors A and B have the same non-zero magnitude.
The magnitude of A + B is equal to the magnitude of A - B . What is the angle between A and B ?
A. 30 degrees
B. 45 degrees
C. 60 degrees
D. 90 degrees
B. 45 degrees
C. 60 degrees
D. 90 degrees
3. How many
significant figures are in the number 0.00640?
A. 1
B. 2
C. 3
D. 4
E. 5
B. 2
C. 3
D. 4
E. 5
4. A vector A with magnitude 25.0 m points along
the positive y direction. If it is rotated by 50.0 degrees counterclockwise,
what are the components of the vector?
A. Ax
= 25.0 cos 50.0° and Ay
= 25.0 sin 50.0°
B. Ax = 25.0 cos 140° and Ay = 25.0 sin 140°
C. Ax = 25.0 sin 140° and Ay = 25.0 cos 140°
D. Ax = 25.0 tan 50.0° and Ay = 25.0 sin 50.0°
E. All solutions above are wrong.
B. Ax = 25.0 cos 140° and Ay = 25.0 sin 140°
C. Ax = 25.0 sin 140° and Ay = 25.0 cos 140°
D. Ax = 25.0 tan 50.0° and Ay = 25.0 sin 50.0°
E. All solutions above are wrong.
5. Assume
that the mass of any cell in the human body is 5 ´ 10-15
kg. If Alice has a mass of 50 kg how many cells are there in her body?
A. 1017
cells
B. 1016 cells
C. 1015 cells
D. 1014 cells
E. 1013 cells
B. 1016 cells
C. 1015 cells
D. 1014 cells
E. 1013 cells
6. The
answer with the correct number of significant figures to the following
calculation: 1.345 ´ 6.72 + 4.51 is
A. 13.5484.
B. 13.548.
C. 13.55.
D. 13.6.
E. 14
B. 13.548.
C. 13.55.
D. 13.6.
E. 14
7. If
vector 
and vector 
, where 
and 
are the units vectors along the x and the y
directions respectively, calculate the magnitude of vector 
.
and vector , where and are the units vectors along the x and the y
directions respectively, calculate the magnitude of vector .
A. 10.3
B. 17.4
C. -6.7
D. 26
E. -12.3
B. 17.4
C. -6.7
D. 26
E. -12.3
8. The
fraction of a cubic kilometer in a cubic millimeter is
A. 10-18.
B. 10-12.
C. 10-9.
D. 10-6.
B. 10-12.
C. 10-9.
D. 10-6.
9. A cube
with a volume of V consists of 6 faces each with an area of A. If the area of
each face is increased by a factor of 64, by what factor does the volume
increase?
10. Vector A points along the y axis with
length 5.0, vector B makes an angle of 55° with respect to the x-axis and has a
length of 7.0. What is the length of vector A - B?
A. 4.1
B. 12.
C. 2.0
D. 35.
E. 9.9
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