HOMEWORK 1 – 20 Questions
Measurements and Motion in a straight line
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1. The meter is currently defined as
A. the distance between two etched lines in a platinum-iridium bar kept in Sévres,
France.
B. the distance between two etched lines in a platinum-iridium bar kept in
Washington, D.C.
C. one ten-millionth of the distance between the North pole and the equator.
D. the distance traveled by light in 1/299,792,458 of a second.
E. 1,553,164.1 wavelengths of red cadmium light in dry air at 25°C.
2. The metric prefix for one one-hundredth is
A. milli.
B. centi.
C. kilo.
D. mega.
E. giga.
3. If you are measuring the length of a room, the most appropriate SI unit is the
A. A kilometer.
B. meter.
C. centimeter.
D. millimeter.
E. micrometer.
4. How many cm2 equal a m2?
A. 10-4
B. 10-2
C. 102
D. 104
E. 106
5. A scalar quantity is defined as
A. a quantity that is specified by a numerical value only.
B. a quantity that is specified by using both a numerical value and a direction.
6. A vector quantity is defined as
A. a quantity that is specified by a numerical value only.
B. a quantity that is specified by using both a numerical value and a direction.
7. In the year 2000, the average size of a transistor in a microprocessor was 250
nanometers. A human hair has a diameter of 70 microns (micrometers). How many
transistors fit across a human hair?
A. 280
B. 28
C. 2800
D. 2.8
E. 0.28
8. The king's chamber of the great pyramid is 10.43 meters long, 5.21 meters wide, and
5.82 meters high. What is the volume of the chamber in cubic feet?
A. 316 cubic feet
B. 3,720 cubic feet
C. 6,530 cubic feet
D. 11,200 cubic feet
E. 13,200 cubic feet
9. Rover eats 0.50 pound of dry dog food per day. How many 5.0-kilogram sacks of dog
food does his owner need to buy in a year?
A. 17
B. 25
C. 52
D. 80
E. 81
10. There are 640 acres in a square mile, and 5280 feet in one mile. What is the length in
feet (to the nearest foot) of the side of a square having an area of one acre?
A. 660 feet
B. 209 feet
C. 165 feet
D. 412 feet
E. 435 feet
11. Two automobiles are 150 kilometers apart and traveling toward each other. One
automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many
hours will they meet?
A. 2.5
B. 2.0
C. 1.75
D. 1.5
E. 1.25
12. The velocity of an object is given as a function of time by v = 4t − 3t2, where v is in
m/s and t is in seconds. Its average velocity over the interval from t = 0 to t = 2s:
A. is 0
B. is −2m/s
C. is 2m/s
D. is −4m/s
E. cannot be calculated unless the initial position is given
13. An object starts from rest at the origin and moves along the x axis with a constant
acceleration of 4m/s2. Its average velocity as it goes from x = 2m to x = 8m is:
A. 1m/s
B. 2m/s
C. 3m/s
D. 5m/s
E. 6m/s
14. At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given
by −0.50t, in m/s2 for t in seconds. At the end of 4.0 s it has traveled:
A. 0
B. 12 m
C. 14 m
D. 25 m
E. 59 m
15. A racing car traveling with constant acceleration increases its speed from 10m/s to
50m/s over a distance of 60 m. How long does this take?
A. 2.0 s
B. 4.0 s
C. 5.0 s
D. 8.0 s
E. The time cannot be calculated since the speed is not constant
16. At a stop light, a truck traveling at 15 m/s passes a car as it starts from rest. The truck
travels at constant velocity and the car accelerates at 3 m/s2. How much time does the car
take to catch up to the truck?
A. 5 s
B. 10 s
C. 15 s
D. 20 s
E. 25 s
17. How far does a car travel in 6 s if its initial velocity is 2 m/s and its acceleration is 2
m/s2 in the forward direction?
A. 12 m
B. 14 m
C. 24 m
D. 36 m
E. 48 m
18. An object with an initial velocity of 12 m/s west experiences a constant acceleration
of 4 m/s2 west for 3 seconds. During this time the object travels a distance of:
A. 12 m
B. 24 m
C. 36 m
D. 54 m
E. 144 m
19. A car starts from rest and goes down a slope with a constant acceleration of 5 m/s2.
After 5 s the car reaches the bottom of the hill. Its speed at the bottom of the hill, in
meters per second, is:
A. 1
B. 12.5
C. 25
D. 50
E. 160
20. A racing car traveling with constant acceleration increases its speed from 10m/s to
50m/s over a distance of 60 m. How long does this take?
A. 2.0 s
B. 4.0 s
C. 5.0 s
D. 8.0 s
E. The time cannot be calculated since the speed is not constant