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Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is
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
Fido weighs 120 N and carries Trixie who weighs 40 N on her back. The support force on Fido's feet is
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is
At the end of two seconds of free fall, an object released from rest will have a speed of
none of the above
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
If the mass of an object does not change, a constant net force on the object produces constant
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
A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration?
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
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 ball is thrown vertically into the air. Because of air resistance, its time coming down compared to its time going up is
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
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
If an element has 16 protons and 17 neutrons and 16 electrons, what is the atomic mass of the
If you remove two protons and two neutrons from a gold atom (Au), what new element is
formed (if any)?
Which of the following statements describes an isotope?
element with the same number of protons but a different number of neutrons
The following statement describes which subatomic particle best?
It is electrically charged
proton and electron
)Elements that are in the same ________ have a tendency to have very similar chemical
properties due to periodic trends.
What is the difference between intrusive and extrusive igneous rocks?
Intrusive: formed below ground, e.g: Granite
Extrusive: formed above ground, e.g: Basalt
When rock is broken down into smaller and smaller pieces, we say the rock has undergone
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
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