Science final exam
The remote control transmits information through waves, such as infrared waves, to the television
A remote control only works when it is pointed at the television. What kind of wave allows this to happen?
loses potential energy and gains kinetic energy
A roller coaster at an amusement park goes from the top of a tall hill to the bottom. During this time, the roller coaster gains___ and loses___
6.3 g
A 20.8-g sample of fuel is burned in the presence of oxygen. As a result, 9.8 grams of carbon dioxide and 17.3 grams of water are produced and captured in containers. According to the law of conservation of matter, how much oxygen reacted with the fuel?
( )
A convex lens bulges outward in its center, and it refracts light rays towards its center. Draw a convex lens
oxygen
An atom of the element ___ has an average atomic mass of about 16 amu
At the bottom of the hill
At what point on the hill will the car have zero gravitational potential energy.
static electricity
Billy was blowing up some balloons for his sister's birthday party. Sally, his sister, grabbed a balloon and rubbed it on his head. Billy's hair began to stick up in little spikes all over his head! Then sally took the balloon and put it up against the wall. It stuck in place! "We learned about this in science class", sally said. Billy's hair stood up and the balloon stuck to the wall because of ____
Use a battery with more voltage
Coiling wire around an iron core and applying an electric current through the wire creates a temporary magnet called an electromagnet. Why would increase the strength of an electromagnet m?
the collisions of molecules within a substance transfer heat energy
Conduction is the process in which___
visible light has higher energy than microwaves
Each section of the electromagnetic spectrum has a different amount of energy. Gamma rays have the highest energy and radio waves have the lowest energy. Compare the energy of visible light to the energy of a microwave.
Solar Panels
Electrical energy can be transformed into other types of energy. We often experience this transformation of energy in our everyday lives. What is an example that represents a conversion from light energy to electrical energy.
accelerate as they fall to Earth
Hail stones do a lot of damage when they fall to the earth and hit homes and cars with great force. They hit with great force because they,
Strap a boulder to the car so that it weighs more
How can we increase the gravitational potential energy of the car?
North--------South
How would a bar magnet orient itself to the magnetic field shown here?
That the balloon and the sweater have opposite charges
If you hold a balloon by a string and the balloon moves toward your sweater and sticks there, what would you infer?
change direction when they change mediums
If you put a pencil ins cup of water, it looks as if it is bent and larger in the water. This is because waves___
Kinetic energy
In a ceiling fan, electrical energy, N, is transferred to another form, M. Energy transfers are never 100% efficient. Some of the energy is "wasted" as heat. To what form is the electrical energy (N) transferred (M) to allow the cowling fan to function?
The force is much less when bunting into the in-field
In baseball, a home run means the batter has hit the baseball into the stands, beyond the baseball field. Compare the force of the batter when bunting the ball into the in-field versus hitting a home run.
sound and vibrations travel faster through solids than gases
In the old west, a cowboy would put their ear on the railroad track to determine if a train was coming. Using this method, they could fall if the train was coming sooner than just listening for the train. A good explanation for this would be that sound travels faster in ___ than gases.
ice-----water----steam
List in order of energy the states of matter
Has a bigger amplitude
Looking at the diagram showing two waves. Notice, wave A is taller and wave B is thinner. Wave A ___
has a shorter amplitude and wavelength
Looking at the diagram showing two waves. Notice, wave A is taller and wave B is thinner. Wave B ___
in a straight line
Newton's first law of motion tells us that an object will move ____ unless acted on by an unbalanced force.
Car
Newton's second law can be expressed as a mathematical formula for the same amount of force needed to accelerate an object. It is that force equals mass times acceleration, or, F=ma. James is trying to prove Newton's second law of motion. He tries to move four different objects with different masses, shapes, and sizes from point A to point B. The objects are a toy car, a car, a refrigerator, and a kitchen table. After some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. The object that takes the most force to move is the ____
potassium
Potassium is a metal and a ___ at room temperature.
Electrons
Static charges can be applied to neutral objects by friction, induction or conduction. What do all of those methods utilize to create this charge?
the boiling point of water is 100 degrees Celsius
The boiling point of water is ___
equal to the total mass of the products
The equation below shows the products formed when a solution of sliver nitrate reacts with the solution of sodium chloride. AgNO3 + NACI > NaNO3 + AgCI (Reactants) > (Products) In this equation, the total mass of the reactants is ___ mass of the products.
Newton's 1st Law
The law of inertia states that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an unbalanced force. Which law of motion is this describing?
The amplitude of the wave decreases while the wavelength increases.
The pattern of this wave changes between its beginning and end. What is the amplitude and wavelength of A and B?
potential to kinetic
The rock is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?
Sodium Chloride and Carbon Dioxide
The table lists: Fe, NaCI, CO2, and AI. This chemical formulas or symbols of a few common substances are listed. Which two substances are compounds?
longer, less
The wavelengths of radio waves are much _____ than the wavelength of microwaves. Therefore, radio waves carry much______energy than a microwave.
add sand
To make salt water a heterogeneous mixture, you would have to
Cobalt has one less proton
Using the periodic table and your knowledge of atomic structure. Cobalt (Co) and nickel(Ni) have almost identical atomic mass numbers. Comparing the a typical nickel and cobalt atoms, what is the number of protons and neutrons of each.
Amplitude
Volume or intensity of a sound wave is measured by the size of the ____ and reported in decibels.
0 m/s
What is the change in velocity during the first second?
It is going through a physical change
What kind of change is freezing?
same direction
When a moving object is acted on by unbalanced forces, the object will move in ____ the force.
The attractions between the water molecules weaken.
When ice melts, what happens to the water molecules?
Virtual image
When light strikes a lone mirror, images form in locations where light does not actually reach. It only appears to the observer as though the light were coming from this position. What type of image is formed?
Magnets with opposite poles are attached to the door and floor, when they come in contact, they attract one another and latch the door.
When magnets come within the magnetic fields of other magnets, they move toward or away from each other, depending on their poles. The door latch is one of many ways magnets can be used in everyday life. What is the charge of the magnet and the door?
Direction of stronger force
Which direction will the movement go?
An electromagnet with 20 coils
Which electromagnet would have the most strength: 5 coils, 10 coils, 20 coils. ?
The car travels at a constant velocity.
Which statement about the car's trip is accurate
Metal is a conductor
Why does a metal spoon left on a bowl of hot soup become warm?
Radio
Wireless internet is a way to send and receive internet data over relatively short distances with low-power transmitters. What type of waves are transmitted for WiFi?
Chemical----iron melting (physical)
Wood decaying is an example of what kind of change?
Reflected to you
You see an image of yourself in a mirror because light waves are ____
Light is faster than sound
You see lighting before you hear thunder because