Forces and Newton's Laws
According to the formula: Force=Mass * Acceleration,
if you keep force constant and increase mass, acceleration will:
a). Increase b). decrease
Decrease
What is a solenoid electromagnetic?
It is a temporary magnet created by wrapping a copper wire around a iron core and running a current through the wire.
Sound waves are longitudinal waves that travel faster in _______ and at _________ temperatures.
a). gas, low
b). solids, high
b). solids, high
Why is building a city near major waterways a benefit for humans?
Access to water for agriculture, transport, travel, etc.
Water droplets have surface tension (form a bubble on a leaf) because of:
a). intermolecular forces between H and O
b). Ionic Bonding
a). intermolecular forces. H and O are not ions.
First
Moving a bar magnet in and out of a wire coil (solenoid) can __________.
a). Look really cool
b). Produce an electric current
b). produce an electric current, because you are changing the magnetic field.
Describe the energy transfer as a stove burner heats up a pot of soup. BONUS if you can name what heating by touching is called.
Electric to thermal.
Conduction (heat by touching objects)
Mining operations destroy valuable ecosystems and can pollute groundwater with runoff from the mine.
How many valence electrons does oxygen have? Hint: it is in group 16.
6 valence electrons
a). inconsistent, lost
b). constant, conserved
b). constant, conserved. Energy will change if the system becomes non-isolated; however.
True or False: A changing magnetic field can produce an electric current AND a current through an electric wire can produce a magnetic field.
True
As light refracts from air to water, what happens to the wavelength and speed, if frequency remains constant based on the equation:
speed= wavelength *Frequency
a) They both increase
b) They both decrease
b). They both decrease because light travels slower in water than in air.
Compare and contrast benefits and costs of wind versus solar energy
Various answers.
Na has a plus 1 valence electron, while Cl is minus 1. When they come together to form NaCl (salt) what type of bond do they create?
a). Covalent
b). Ionic
b). Ionic. Na and Cl are ions (more or less electrons than a full shell).
According to Coulomb's Law, like (same) charges ______ and unlike (opposite) charges _______.
a). Attract, Repel
b). Repel, Attract
b). repel, attract. Remember that opposites attract.
A step-up transformer has more voltage output than input because:
a). it has more output coils
b). it has more input coils
Which model of light is more useful for explaining the motion of light?
a). Particle Model
b). Wave Model
c). Trick question, they are both equally useful!
c). Trick question, they are both equally useful!
Explain how an ultrasound machine is able to view different organs inside the body.
Sound waves are absorbed and reflected differently by different organs and are able to be viewed as different from each other.
Water has a ________ boiling point because it has ______ intermolecular forces.
a). low, weak
b). high, strong
b). high, strong. Water takes a long time to boil.
How does gravitational potential energy change when height is increased?
a). it increases
b). it decreases
a). it increases. The higher you are, the more gravitational potential energy you have.
An example of a good electrical conductor is ______ because it conducts electricity well.
a). metal b). plastic
a). metal.
What is the energy conversion for a solar flashlight that uses an battery to hold a charge?
Radiant (sun) --> Electrical --> chemical--> electrical--> radiant
Describe how a satellite radio transmits a signal.
A satellite radio transmits its signal from a ground-based station to one or more satellites orbiting Earth. The satellite bounces the signal back to specialized receivers on the ground, commonly located in automobiles and home stereo systems.
In a balanced chemical equation:
2O +4H --> 2H2O
total matter of the reactants (left side) must ______ the total matter of the products (right side) of the equation.
a). equal b). not equal.
a). equal. Matter is conserved (1st law of thermodynamics)