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Physical Science
Final Exam
I.
Multiple Choice/ fill in
1.
What is the number .006 in scientific notation?
a. 0.6 x 10-2
2.
c. 6 x 10-3
d. 6 x 10-2
c. .08
d. 8,000
Convert 80 cm to m
a. 800
3.
b. 6 x 103
b. 0.8
Find the circumference of the sun given that the sun’s diameter is 100 times the
diameter of earth. Earth's diameter is about 8,000 miles.
a. about 250,000 miles
d. 250 miles
b. about 2,500,000 miles
c. about 92,000,000 miles
4. 945 inches to meters is closest to:
a. 3101 meters
d. 0.5 meters
b. 2 meters
c. 24 meters
5. A car with a mass of 50 kg accelerates from rest under a force of 50 Newtons for
5 seconds Find its acceleration.
a. 1 m/s2
d. 1100 m/s2
b. 10 m/s2
c. 302,500 m/s2
6. Find the final velocity of the car in #5:
a. 12.5 m/s
b. 5 m/s
c. 15 m/s
d. none of these
7. A car (mass = 1000 kg) accelerates at 6 m/s2. How much force is exerted by the engine?
a. 300
b. 3000 N
8.
b. 6000 N
d. 3000 kg-m/s
How many liters are in .01 cubic meters?
9.
What is the final kinetic energy of the car in #6 above?
a. 0 J
b. 1125J
c. 5625 J
d. not given
10.
The principle of conservation of momentum states:
e.
f.
g.
d.
11.
Which formula below is Newton's second law?
a. F=ma
12.
The total momentum in any collision is the same before as after the collisoin
Fossil fuels are being depleted
It’s a good idea to turn of the light when you leave a room.
Energy is never created or destroyed but only changes from one form to
another
b. D = M/V
d. p = mv
In the formula PE = mgh, PE is measured in:
a. Newtons
13.
c. W = Fd
b. Newton-meters
c. Kg-m/s
d. kilograms
A good soprano can shatter a wine glass with just her voice. This is explained by
the principle of resonance. What freqency would shatter a 5 cm diameter wine glass
if the diameter is equal to one-fourth of the wavelength of the note?
a. 6800 hz
b. 68 hz
c. 340 hz
d. 1700 hz
14. Sound waves are:
a. longitudinal waves
b. transverse waves
15. Increasing the temperature in air causes the speed of sound in air to:
a. decrease
b. remain the same
c. increase
16. A positive electric charge:
a. attracts other positive charges
c. attracts negative charges
b. repels negative charges
17. North the north pole of a magnet is attracted to:
a. magnetic south poles
b. magnetic north poles
18. Acceleration is defined as:
c. neither of these
c. neither of these
a. A change in speed divided by time
c. a change in velocity divided by time
b. a change in force
19. How much work does the 50 kg student do who climbs 3 meters up the stairs?
a. 150 J
20.
b. 150 N
c. 1500 J
d. 1500 N
When an object moves in a straight line at a constant speed, we KNOW that:
a. There must be an unbalanced force acting on that object
b. The total force acting on the object is zero
c. The velocity of the object is changing
21. You are a peace core volunteer in a remote area. The people of the village want
to cast an iron bell for sending signals to villagers working within a few miles. of
the central square. They know you have studied some science in the United states.
How many pounds of iron will they have to melt down? You determine the volume of
the cast to be 15 liters (how much water it holds). The density of iron is 7.8 g/ml.
22.
A jet accelerates at 20 m/s2. The thrust generated by the engine is 800,000 Newtons.
What is its mass?
a. 16,000,000 kg
c. 40,000 kg
b. 640 billion kg
d. none of these
23. Find the density of a brick with a mass of 5000 grams , a length of 20 cm, a
width of 10 cm; and a height of 5 cm.
a. 0.2 g/cm
c. 5000 g/ml
b. 5 g/ml
d. 0 g/ml
24. Find the power generated by the student in # 19 above if it takes her 3 seconds to
ascend the stairs.
a. about 500 watts
d. about 4500 newtons
b. about 500 newtons
c. about 4500 watts
25. The kinetic energy of an object is the energy it has because:
a. of its location
b. of its mass only
d. of its mass and velocity
c. of its velocity only
26. T or F: Your pencil is attracted to the giant red star Antares which is over 300
light years from earth.
27.
The amount of heat needed to melt 10 grams of ice is:
a. 80 Joules
b. 80,000 calories
c. 800 calories
d. 8 calories
28.
Which below is a unit of distance:
a. The kilogram
d. The pint
b. The liter
c. The foot
29.
Find the mass of one quart of water:
30.
How much work does gravity do when one gallon of water falls 20 meters
over a dam? The mass of 1 gallon of water is 4 times your result in #29
use g = 10 m/s2
a. about 76 J
b. about 760 J
c. about 76 N
d. about 760 N
31.
What is the speed of sound in water if a 576 hz (the musical 'D') sound has a wavelength
of 2.5 meters?
a. 1440 m/s
32.
c. 3600 m/s
The force of attraction between two electrically charged socks is .09 N. When the
distance between them is tripled, the force of attraction will be:
a. .81 N
33.
b. 230.4 m/s
b. .27 N
c. .01 N
When wax melts it:
a. absorbs heat from its surroundings
b. releases heat to its surroundings
c. neither releases or absorbs heat
34.
The method that astronomers use to determine the distance
to nearby stars by solving triangles is called:
a.
b.
c.
d.
35.
the brightness method
the helgramite method
the parallax method
the H-R diagram method
What is the momentum of a .05 kg bullet fired at 200 m/s?
a. 10 m/s
36.
b. 10 N
c. 10 kg-m/s
d. 40,000 kg-m/s
Five seconds after dropping a rock into a deep well, you hear the splash.
How deep is the well in feet?
a. 120
b. 400
c. 80
d. none of these
37.
How much heat does it take to raise 10 grams of melt water (at 0 degrees C)
to the boiling point at 100 C?
a. 16 calories
38.
c. 1000 calories
Heat transfer through direct physical contact is called:
a. a foul
d. radiation
39.
b. 400 calories
b. conduction
c. convection
Light slows when it:
a. Enters glass from air
b. Enters air from glass
c. Light has the same measured speed in all materials
40.
Faraday's law is that:
a. permanent magnets can induce (cause) electric currents
b. moving electrons produce magnetic fields
c. moving magnetic fields can induce (cause) electric currents
Problems: do 5 below for 4 points each (show work):
1.
Solve F  G
m1m2
for G
d2
2.
Vectors have both magnitude and direction.. List a three examples of
vectors that we studied this semester (i.e. velocity is one.....).
3.
State Newton's three laws of motion:
Newton's first law:
Newton's second law:
Newton's third law:
4.
As we discussed in class, the statement "Sir Isaac Newton discovered gravity" is
false. What was it about gravity that Newton actually did discover?
5.
State any two of the following:
A) The first law of thermodynamics:
B) The law of conservation of momentum
C) The second law of thermodynamics
6.
Explain any two of the following:
How do astronomers know:
A. The distance to nearby stars (i.e. explain the parallax method)
B. The temperature of stars
C. The mass of a star
7.
I might also give you a problem where you must interpret the
HR diagram in this section.