63 terms

# PSC FINAL

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A kilogram is a measure of an object's
Mass
Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has the same
Nothing the same
Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is
the same
You would have the largest mass of gold if it weighed 1 N on the
moon
When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west with 15 N, the combination of these forces on the block is
5 N east
An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. The net force is
none of the above
A 50-N object falling in air experiences 50 N of air resistance. The amount of net force on the falling object is
0 N
Whenever the net force on an object is zero, its acceleration
Is Zero
Fido weighs 120 N and carries Trixie who weighs 40 N on her back. The support force on Fido's feet is
160 N
When you stand at rest on a floor, the number of vertical forces acting on you is
two
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10 N
Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is
5 yards/second
When a ball increases in speed by the same amount each second, its acceleration
is constant
At the end of two seconds of free fall, an object released from rest will have a speed of
none of the above
An object in free fall has a speed of 60 m/s. One second later its speed is
70 m/s
An object in motion tends to remain in motion
without the need of a force
A sheet of paper can be pulled from beneath a box of cereal without toppling it if the paper is jerked quickly. This best demonstrates that
the box has inertia
The net force on any object moving at constant velocity is
0
Newton's second law directly involves
acceleration
If the mass of an object does not change, a constant net force on the object produces constant
acceleration
If an object's mass decreases while a constant force acts on it, the acceleration
increases
A tow truck exerts a force of 3000 N on a car that accelerates at 2 m/s2. The mass of the car must be
1500 kg
A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration?
3 m/s^2
A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block is
2 m/s^2
A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is ****
10 times as much as for the 1-kg book.
A 10-N falling object encounters 4 N of air resistance. The net force on it is
6N
A rock is thrown vertically into the air. At the top of its path, its acceleration is
9.8 m/s^2
A ball is thrown vertically into the air. Because of air resistance, its time coming down compared to its time going up is
More
When an object falls through the air, as velocity increases its acceleration
decreases
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is
0
Which of the following statements best describes an element
material consisting of only one type of atom
What is the approximate mass of a carbon atom in atomic mass units (amu)? How about a carbon dioxide molecule?
A carbon atom has a mass of about 12 amu. Carbon dioxide would then have a mass
of 44 amu.
Which contributes more to an atom's mass: electrons or protons? Which contributes more to
an atom's size
Protons contribute to its mass, and electrons contribute to its size.
Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13
a 1-gram sample of carbon-12
If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the
element?
15
N
7
If an element has 16 protons and 17 neutrons and 16 electrons, what is the atomic mass of the
element?
33
If you remove two protons and two neutrons from a gold atom (Au), what new element is
formed (if any)?
Ir
Which of the following statements describes an isotope?
element with the same number of protons but a different number of neutrons
Which element has the atomic number 32
Ge
The following statement describes which subatomic particle best?
It is electrically charged
proton and electron
Which of the following elements is in the fifth period?
RB
Which of the following elements is a transition metal?
AG Silver
Which of the following elements is an alkali metal?
Li
Which of the following elements is a halogen?
Cl
The repeating trends that take place when examining the elements are called
periodicity
)Elements that are in the same ________ have a tendency to have very similar chemical
properties due to periodic trends.
Group
Which of these does not describe a metal at room temperature?
gas
How many electrons are there in the third shell of sodium, Na (atomic number 11)?
one
What is the valence shell?
It is the outermost shell of electrons in an atom
The two most abundant elements in Earth's crust are
silicon and oxygen
What is the 4 c' characteristics of the diamond
...
Rocks are grouped into three classes depending on how the rock was
formed
Igneous rock is formed from
crystallization of molten magma
What is the difference between intrusive and extrusive igneous rocks?
Intrusive: formed below ground, e.g: Granite
Extrusive: formed above ground, e.g: Basalt
The majority of surface rocks are
sedimentary
When rock is broken down into smaller and smaller pieces, we say the rock has undergone
mechanical weathering
Minerals are composed of
inorganic solids
The protective shells that many sea organisms grow are not minerals because they
are organic
All minerals are
crystalline solids
Most minerals can be identified by easily observable physical properties. In order of most
useful to least useful, the identifiable physical properties are
hardness, cleavage, density, crystal form, and color
Color is not a reliable means for mineral identification because
minerals come in a variety of colors, and chemical impurities in the mineral can affect
color
The property of a mineral to break along planes of weakness is referred to as
cleavage
Mohs scale is based on minerals that have different
hardness