Transcript All waves move matter. All waves transfer energy. All waves can

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In order to determine the velocity of an object, what
measurements must be made?
time and distance
time, distance, and mass
time, distance, and direction
time, distance, and volume
time, distance,
and direction
Not close!
An analogy can be drawn between the work done by an
electric current flowing through an electrical appliance
and the work done by water flowing over a waterfall. In
such an analogy, identify the property of the electric
current that is analogous to the rate of flow of water
over the fall.
power
voltage
amperage
resistance
amperage
If you thought that
you were wrong,
you are right!
Identify the types of fields that interact to produce
motion in an electric generator.
an electrical field and a gravitational field
a magnetic field and an electrical field
two electrical fields
two magnetic fields
a magnetic field
and an electrical field
STOP!
Identify the type(s) of current that can be used to power
electric motors.
direct current only
absolute current only
direct current or alternating current only
alternating current, direct current or absolute current
direct current or
alternating current
only
Complete the following reaction.
NaOH(aq) + HCl(aq)
2NaCl(1)
NaCl(s)
NaCl(aq)
2NaCl(aq)
_____+ H2O(l)
NaCl(aq)
Which of the following will have the lowest pH?
rainwater
distilled water
soapy water
bleach
rainwater
Dr. M wants to perform research on the effects of
exposure to gamma radiation. Dr. B has developed a new
type of instrument that fires gamma radiation at tumors;
he wants to research the effectiveness of his "gamma
knife." What is the fundamental difference between the
research performed by these two doctors?
Dr. M must know about nuclear decay, and Mr. B doesn't need to.
Dr. M's research is ethical and Dr. B's is not.
Dr. M is conducting a scientific investigation and Dr. B is not.
Dr. B is focusing on technological design and Dr. M is not.
Dr. B is focusing on
technological design and
Dr. M is not.
Alan constructs a circuit that has two 1.5 V batteries
arranged in series. These batteries power a single light
bulb. What will happen if Alan adds another load in series?
The resistance of the circuit has increased, so more current
will flow.
The voltage of the circuit has increased, so more current
will flow.
The resistance of the circuit has decreased, so less current
will flow.
The resistance of the circuit has increased, so less current
will flow.
The resistance of the
circuit has increased, so
less current will flow.
Which of the following substances is the most chemically
stable?
Mg2+
Mg+
ClMgCl2(s)
MgCl2(s)
What is the danger of an uncontrolled chain reaction within
the core of a nuclear fission reactor?
An uncontrolled chain reaction will use up all of the fuel in
the reactor and force the fission of the metals that make up
the core casing.
An uncontrolled chain reaction will produce enough heat to
crack the reactor core open, releasing radioactive material.
An uncontrolled chain reaction will produce enough
electrons to electrically charge the reactor core.
An uncontrolled chain reaction will produce enough heat to
induce fusion in the reactor core, which will result in an
explosion.
An uncontrolled chain reaction
will produce
enough heat to crack the
reactor core open,
releasing radioactive
material.
The loss or gain of which subatomic particle has the
greatest effect on chemical reactivity?
electron
proton
neutron
nucleon
electron
Too bad!
For new scientific knowledge to be gained, scientists must
share their ideas. What is an appropriate way for scientists
to communicate their findings?
Make flyers advertising their results.
Write a book immediately after the experiment is
conducted, pronouncing the discovery as fast.
Hold a press conference to share the information gained.
Submit complete information regarding the experiment to a
peer-reviewed scientific journal.
Submit complete information
regarding the experiment to a
peer-reviewed scientific journal.
When energy is transformed from one form to another,
some of the energy is lost in the form of
mechanical energy.
hydrogen gas.
water.
thermal energy.
thermal energy.
Joey hit a wall with a 1 meter long sledgehammer
20 times with a force of 200 Newtons.
Much to Joey's dismay, the wall remained undamaged.
If work = force X distance, how much
work did Joey do on the wall?
0 joules
10 joules
200 joules
4000 joules
0 joules
A recently-used hot ceramic teapot is placed on a cold trivet.
Which statement is correct about the sequence of thermal
energy transfers?
The air transfers energy to the teapot and trivet, and they
become cool.
The teapot transfers all of its energy to the air and becomes
cool.
The teapot transfers some energy to the trivet and some energy
to the air and becomes cool.
The trivet transfers energy to the teapot and the teapot becomes
cool.
The teapot transfers some energy
to the trivet
and some energy to the air
and becomes cool.
Smart glass technologies have become increasingly popular.
British scientists recently developed a window glass that
helps buildings stay cool. At regular temperatures, the glass
allows in both infrared (IR) and ultraviolet (UV) light. But
above 29°C, the coating on the glass undergoes a chemical
change, causing it to block IR light. What happens to the IR
light?
It is absorbed by the glass.
It is refracted by the glass.
It is reflected by the coating on the glass.
It is refracted by the coating on the glass.
It is reflected by the
coating on the glass.
Which of the following produces energy
from processes that do not involve a
chemical change?
a bonfire
a fossil fuel power plant
a nuclear power plant
a car
a nuclear power plant
(nuclear energy change)
What characteristic do all waves share?
All waves move matter.
All waves transfer energy.
All waves can move through a vacuum.
All waves travel at 3.0X108 m/s.
All waves transfer energy.
What happens when two negatively-charged
particles are brought together?
They undergo combustion.
They are repelled from each other.
They are attracted to each other.
They form an isotope.
They are repelled from each
other.
What is the resistance of a hair dryer that
uses 4 A of current when the voltage is 120 V?
480 ohms
40 ohms
30 ohms
0.33 ohms
30 ohms
What was the main problem with
J.J. Thomson's model of the atom?
It did not account for protons, and so the
Thomson model was negatively charged.
It did not account for electrons, and so the
Thomson model was positively charged.
It hypothesized many more
electrons than protons.
It did not account for a centralized nucleus
containing most of the atom's mass.
It did not account for a centralized
nucleus containing most of the
atom's mass.
NOT CLOSE!
The speed of an object increases 10 m/s over 10 seconds.
What is its acceleration?
0 m/s2
1 m/s2
10 m/s2
100 m/s2
1
2
m/s
Which of the following is a source of
potential energy that could release radiant energy?
a diamond
a sunflower seed
a neutron
a match
a match
Without knowing the ultimate purpose of each activity,
which of the following would most likely be a
part of a scientific investigation?
traveling to the rain forest
extracting DNA samples from eight
varieties of rain forest beetles
moving to the rain forest to see if you can survive there
listening to the music of native Indians
extracting DNA samples from eight
varieties of rain forest beetles
Which of the following is a
technological design investigation?
buying a go-cart
installing a new bumper
finding ways to make the go-cart faster
painting the go-cart
finding ways to make
the go-cart faster
Make your wager
Lamar really likes spiders and wants to do a Science Fair
project on some aspect of spiders.
If the theme of the Fair that year was "Innovations"
which topic would make an acceptable entry for Lamar?
Spiders Throughout History
New Applications for Spider Venom
Comparing Spider DNA to Human DNA
The Everyday Lives of Spiders
New Applications for Spider
Venom