Physic final
Increased air pressure on the surface of hot water tends to
prevent boiling
The first law of thermodynamics is a restatement of the
principles of conservation
When the distance between two charges is halved, the electrical force between the charges
quadrupled
The planet Earth loses heat mainly by
radiation
We are best at hearing
We cannot hear ultrasonic or infrasonic sound. None of the choices are true
The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then
Zero
In the mountains, water in an open pot boils at
a lower temperature than at sea level
Electrons are made to flow in a wire when there is
a potential difference across its ends
The unit of electric charge, the coulomb, is the charge on
a specific large number of electrons.
Superconductors are noted for their
absence of electric resistance
Objects that radiate relatively well,
absorb radiation relatively well
The pupil of your eye is a net
absorber of radiant energy
When a solid is changed to a liquid state, the solid
absorbs energy
Cold water will warm to room temperature faster in a
black tea pot.
A balloon will stick to a wooden wall if the balloon is charged
either
A circuit breaker serves the same purpose as
fuse
A neon atom has a larger atomic number than a helium atom. At the same temperature and pressure, how does the speed of sound in helium gas compare to the speed of sound in neon gas?
greater in helium than in neon
If you double the frequency of a vibrating object, its period
half
Electromagnetic waves consist of
oscillating electric and magnetic fields.
to say that one wave is out of phase with another is to say that the waves are
out of step
The force on an electron moving in a magnetic field will be the largest when its direction is
perpendicular to the magnetic field direction.
When heat is added to boiling water, its temperature
stays the same
An aircraft that flies faster than the speed of sound is said to be
supersonic
Which involves the larger number of calories?
the condensation of 1 gram of steam at 100 degrees Celsius to 100 degrees Celsius water
Evaporation is a cooling process because
the more energetic molecules are able to escape the liquid
An iron rod becomes magnetic when
the net spins of its electrons are in the same direction
When the speed of sound near the ground is greater than higher in the air, sound tends to be bent
upward
Which would burn the most: 100g of water at 100 degrees C, 100g of steam at 100 degrees C, or both?
100 degrees of steam
The amount of energy ultimately converted to heat by a light bulb is about
100%
A tuning fork of frequency 200 hertz will resonate if a sound wave incident on it has a frequency
100Hz
A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed?
10m/s
A power line with a resistance of 2 ohms has a current of 80 A in it. The power dissipated in the line is
12,800
Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the
2nd law
Two tuning forks produce sounds of wavelengths 3.4 meters and 3.3 meters. Approximately what beat frequency is produced?
3 Hz
A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves?
3 m/s
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
30 hertz and it travels at 60 m/s.
An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can handle 15 A of current. How many heaters can be safely operated in the circuit?
5
A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?
50 V
A coulomb of charge that passes through a 6-volt battery is given
6 j
The ideal efficiency for a heat engine operating between temperatures of 2700 K and 300 K is
89%
The technology for orbiting solar power plants
Already exists
To say that electric charge is conserved is to say that electric charge
Can neither be created nor destroyed
Two protons attract each other gravitationally and repel each other electrically. By far the greater is
Electrical repulsion
A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?
Electron
Food in a pressure cooker is cooked faster because of the
Higher temp
To say that electric charge is quantized is to say that the charge on an object
Is a whole-Number multiple of the charge of one electron
Which pole of a compass needle points to a south pole of a magnet?
North
The direction of an electric field is the direction of the force that it would exert on
Proton
Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of
Resonance
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principle of
Resonance
An important factor in the process of regelation is
all
Adiabatic processes occur in the
all of above
A heat engine would have 100 percent efficiency if its input reservoir were
any finite temperature if the exhaust sink were at absolute zero.
A wave barrier is produced when a wave source moves
as fast as the waves it produces.
If a steady magnetic field exerts a force on a moving charge, that force is directed
at right angles to the direction of the field.
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
attract
An uncharged pith ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pith ball
becomes polarized.
Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be
black
You can briefly touch a hot clothes iron with your bare finger if it is wet because the wetness
both of these
We feel uncomfortably warm on a muggy day because water molecules are
condensing on our bodies.
Heating the Earth's atmosphere is caused by energy
consumption, production
Ice is put in a cooler in order to cool the contents. In order to speed up the cooling process, the
crushed
As more lamps are put into a series circuit, the overall current in the power source
decrease
Sue's refrigerator is built into the wall of her kitchen, so that it exhausts heat to the outdoors rather than into the room. If Sue tries to cool her kitchen by leaving the refrigerator door open, the room temperature will
decrease a little
As we become older, the frequency range of human hearing
decreases.
To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add
energy
It is possible to wholly convert a given amount of heat energy into mechanical energy.
false
Inhaling helium increases the pitch of your voice. The reason for this is that sound travels
faster in helium than in air.
Firefighters find that the temperature of burning material is best lowered when water is
fine mist
The sonic boom at ground level produced by an aircraft will be reduced if the aircraft
flies higher
An object will normally be a net radiator of energy when its temperature is
higher than its surroundings
A positive charge and a negative charge held near each other are released. As they move, the force on each particle
increase
When a volume of air is compressed and no heat enters or leaves, the air temperature will
increase
If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be
increased
The energy of sound in air eventually becomes
increased internal energy of the air
If at a concert you run toward the orchestra, the frequency of the sound you hear will be
increased.
As more lamps are put into a parallel circuit, the overall current in the power source
increases
Morning dew on the grass is a result of
slow-moving water molecules sticking to one another.
Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will carry
less current
When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
less than 1 cm/s.
When bringing water to a boil in the mountains, the time needed to reach the boiling point is
less than at sea level.
Double the absolute temperature of helium gas and the average speed of its molecules
less than doubles
Charge carriers in a metal are electrons rather than protons, because electrons are ______.
loosely bound
A wire that carries an electric current
may be electrically charged
Connect a pair of lamps in series and you draw current from the connected battery. Connect the same lamps in parallel and you draw
more
To turn 50 grams of boiling water to steam requires
more calories than are required to bring 50 grams of ice at absolute zero to the boiling point.
An explosion occurs 34 km away. Since sound travels at 340 m/s, the time it takes for the sound to reach you is
more than 20s
Double the frequency of sound and you also double its
none of these
A possible cause for the existence of the Earth's magnetic field is
none of these.
Suppose you want to save energy and you're going to leave your cool house for a half hour on a hot day. You should turn the temperature setting on the air conditioner
off all together
Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
the same
Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles have
the same sign.
On a humid day, water condenses on the outside of a glass of ice water. This phenomenon occurs mainly because of
the saturation of cooled air
Boiling water does not increase in temperature when additional heat is applied because
the temperature doesn't change in a change of state.
A circuit is powered with a battery. Charge flows
through both the battery and the rest of the circuit.
Sound travels faster in air if the air is
warm
Chinook winds tend to
warm an environment
When water vapor condenses on the inside of a window, the room becomes slightly
warmer
To say that evaporation is a cooling process is to say that the
water left behind cools.
Double the frequency of a sound and you halve its
wavelength