the energy per molecule is high, but the total energy transferred is small
question
Reason why people can walk barefoot on red hot coals of wood without burning their feet
answer
low thermal conductivity of the coals
question
a boat loaded with scrap iron floats in a swimming pool. when iron is thrown overboard, the pool level will
answer
fall
question
compared to a giant iceberg, a hot cup coffee has
answer
higher temperature, but less thermal energy
question
an egg is placed at the bottom of a bowl filled with water. Salt is slowly added to the water until the egg rises and floats. From their experiment one concludes
answer
the density of salt water exceeds the density of the egg
question
if you want to cook eggs by boiling them while in the mountains, then compared to sea level cooking you should
answer
boil the eggs for a longer time
question
when an object is partly or wholly immersed in a liquid, it is buoyed up
answer
by a force equal to the weight of liquid desplaced
question
the lowest temperature possible in nature is
answer
-273 degrees C
question
before ice can form on a lake, all the water in the lake must be cooled to
answer
4 degrees C
question
A dam is thicker at the bottom that at the top because
answer
water pressure is greater with increasing depth
question
a suction cup sticks to a wall it is
answer
pushed to the wall by the atmosphere
question
a balloon is buoyed up with a force equal to the
answer
weight of air it displaces
question
a bubble of air released from the bottom of a lake
answer
becomes larger as it rises
question
when an ice cube in a glass of water melts the water level
answer
remains the same
question
heat energy is measured in units of
answer
remains the same
question
heat energy travels from an object with a high
answer
temperature to an object with lower temperature
question
one liter of water has a mass of
answer
1 kg
question
on a windy day, atmospheric pressure
answer
decreases
question
suppose you rapidly stir some raw eggs with an eggbeater the temperature of the eggs will
answer
increase
question
consider two mercury barometers one with twice the cross sectional area of the other. neglecting capillary mercury in the smaller tube will rise
answer
the same height as in the larger tube
question
When a gas is changed to a liquid phase, the gas
answer
releases energy
question
as a system becomes more distorted, entropy
answer
increases
question
if the volume of an object were to double while its mass stays the same its density would
answer
halve
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when a boat sails from fresh water to salt, the boat will float
answer
higher in the water
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when a chocolate bar is cut inhale its density is
answer
unchanged
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an umbrella tends to move upwards on a windy day principally because
answer
air pressure is reduced over the curved top surface
question
when gas in a container is squeezed to half its volume, its density
answer
doubles
question
the silver coating on the glass surfaces of thermos bottle reduces energy that is transferred by
answer
radiation
question
when water at 4C is heated it expands when water at 4C is cooled it
answer
expands
question
which has the greater density a lake full of water or a cup full of lake water
answer
both have the same density
question
a floating ice cube contains small pieces of iron after melting the water level will
answer
fall
question
the reason a life jacket helps you float is
answer
the density of both you and the jacket together is less than your density alone
question
your feet feel warmer on a rug than on a tile floor because the rug
answer
is a better insulator than tile
question
the volume of water displaced by a floating 20 ton boat is
answer
the volume of 20 tons of water
question
a substance that heats up relativity quickly has a
answer
low specific heat capacity
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when a sample of 0C water is heated it first
answer
contracts
question
when a sample of 4C water is cooled it
answer
expands
question
if you hold one end of a metal bar against a piece of ice, the end in your hand will soon become cold, does cold flow from the ice to your hand
answer
no
question
when thermal insulation such as spun glass or rock wool is placed beneath the roof of a house then in cold weather the insulation will
answer
slow the flow of heat from inside the house to the outside
question
if a good absorber of radiant energy were a poor emitter its temperature compared with its surroundings would be
answer
higher
question
which of the following does not emit radiation
answer
everything emits radiation
question
it is commonly thought that a can of beverage will cool faster in the coldest part of the refrigerator. knowledge of newtons law of cooling
answer
supports this knowledge
question
If earth radiated more energy than it absorbs from the sun earths average temperature would
answer
decrease
question
When a liquid changes phase to a gas it
answer
absorbs energy
question
there is twice as much molecular kinetic energy in 2 liters of boiling water as in 1 liter of boiling water. which will be the same for both
answer
temperature
question
when the same amount of heat is added to each of the two containers of water, the temperature increase in each will
answer
depend on the amount water in each
question
you heat a half cup of tea and its temperature rises by 8C how much will the temperature rise if you add the same amount of heat to a full cup of tea
answer
4C
question
when work is done on a system compressing air in a tire pump for example the temperature of the system
answer
increases
question
when a hot cup is filled with cold water the direction of heat flow is
answer
from the cup to the water
question
your garage gets messier each week in this case the entropy of your garage is
answer
increasing
question
which has the higher specific heat water or land
answer
water
question
when stringing telephone lines between poles in the summer it is advisable to allow the lines to
answer
sag
question
ring is hot the room temperature ball
answer
fits into the hole with more room to spare
question
when you squeeze a party balloon to 0.25 its volume the pressure in the balloon
answer
is 4 times greater
question
atmospheric pressure is caused by the
answer
weight of Earths atmosphere
question
two people are drinking soda using straws. do they suck the soda up. could they drink soda this way on the moon
answer
no they reduce air pressure in the straw and the atmospheric pressure pushes the soda up. No they could not do the same thing on the moon
question
a 10kg load on the left piston will support a 500 kg load on the right piston. how does the pressure of fluid against the lower part of the left piston compare with the pressure against the lower right piston
answer
same pressure on each
question
in a hydraulic device it is impossible for the
answer
energy output to exceed energy input
question
is there a buoyant force acting on your classmate at this moment?
answer
yes but it is insignificant compared with their weights
question
water with air bubbles flows through a pipe that gets narrower in the narrow region the water gains speed and the bubbles are
answer
larger
question
what happens to the internal water pressure in a narrowing pipe of moving water
answer
pressure is less
question
The pressure in a stream water is reduced as the stream speeds up. How then can a stream of water from a fire hose actually knock a person off his or her feet
answer
the pressure due to waters change in momentum can be much greater than the waters internal pressure
question
air speeds up as it is blown across the top of the vertical tube. How does this affect the air pressure in the vertical tube, and what then occurs
answer
reduced air pressure in the tube lets atmospheric pressure on the liquid surface push liquid up into the tube where it joins the jet of air in a mist
question
mercury has density of 13.6 grams per cubic centimeter how much heaver is it than one cubic centimeter of water
answer
13.6 times heaver
question
at which hole in the cup is there more pressure on the water shooting out of the hole
answer
bottom hole
question
Consider two tubes filled with water at the same height one with fresh water water and the other with salt water the pressure is greater at the bottom of the tube with
answer
salt water
question
if a hole is punched in the side or bottom of a boat water spurting in will be
answer
perpendicular to the surface
question
a fish normally displaces its own
answer
weight of water and volume of water
question
two cans are placed apart on straws when air is blown in between the cans, what will they do
answer
they will move toward each other
question
which of these has the greatest density
answer
100kg of lead
question
suppose water from a tall tower supplies a nearby home if water faucets upstairs and downstairs are turned fully on will more water per second flow from the downstairs or the upstairs faucet or will water flow in each be the same
answer
downstairs
question
does a 3 meter deep lake or a 6 meter deep small pond exert more pressure on a dam
answer
the six meter deep small pond
question
the reason a person finds it easier to float in salt water compared with fresh water is that in salt water
answer
a smaller volume of water id displaced
question
why is an umbrella in danger of being turned inside out on a windy day
answer
The wind moving over the top of the umbrella exerted less pressure than the still air
beneath. The still air pushed the umbrella up from below.
question
why will spraying fruit trees with water before frost help to protect the fruits from freezing
answer
As the water freezes, it loses heat to the cold air, but at the same time, it loses heat to the leaves, stems and fruit of the tree too, so it actually warms up the tree a small amount as well. Once the ice is frozen on the tree, it also acts as an insulator to prevent more cold from getting to the tree itself. water is a great insulator
question
would it be slightly more difficult to draw soda through a straw at sea level or on top of a very high mountain
answer
It would be harder on the top of a mountain because the pressure of the atmosphere is lower the higher you go. The atmospheric pressure pushes on the surface of the liquid when you suck which helps the liquid move up the straw. At sea level, the pressure is fourteen and a half pounds per square inch and reduces as you move higher.
question
why is it important to protect water pipes so they do not freeze
answer
Because water expands when it is frozen and this increased pressure will cause the pipes to break.
question
which is larger celsius or kelvin
answer
Celsius
question
which is larger fahrenheit or celsius
answer
celsius
question
which is larger fahrenheit or kelvin
answer
fahrenheit
question
which has the greater amount of internal energy an iceberg or a cup of hot coffee
answer
The hot coffee has a higher temperature, but not a greater internal energy. Although the iceberg has less internal energy per mass, its enormously greater mass gives it a greater total energy than that in the small cup of coffee.
question
Bermuda is close to north Carolina but unlike north Carolina it has a tropical climate year round. why?
answer
Bermuda is an island. the surrounding water warms it when it might be too cold, and coolsit when it might be too warm
question
the greater the temperature difference of two objects the more rapidly heat energy will be transferred
answer
True
question
sand has higher heat capacity than water
answer
false water has a much higher heat capacity
question
radiation can travel in a vacuum
answer
false
question
heat will not flow spontaneously from a colder to a warmer body
answer
true
question
absolute zero refers to 0C
answer
False it is 0k
question
In which situation below did conduction take place
answer
burning yourself on a hot stove
question
Which of the following normally warms up faster when heat is applied
answer
iron
question
completely submerged object always displaces its own
answer
volume of fluids
question
one celsius unit is equivalent to
answer
one Kelvin degree
question
a substance can absorb heat energy by the process of
answer
conduction, convection, radiation
question
In which of the following is intermolecular bonding weakest
answer
gases
question
it takes longer time to cook eggs by boiling in the mountains compared to sea level is because
answer
low boiling temperature of water
question
if you squeeze an air filled balloon to one third its volume air pressure inside is about
answer
three times as much
question
when a bimetallic bar made off copper and iron strips is heated the bar bends towards the iron strip the reason for this is
answer
copper expands more than iron
question
the reason a life jacket helps you float is
answer
the density of both you and th jacket together is less than your density alone
question
during a very cold winter, water pipes sometimes burst the reason for this is
answer
water expands when freezing
question
the energy involved in a phase change is called the
answer
latent heat
question
ice cubes submerged at the bottom of a liquid mixture indicate that the mixture
answer
is less dense then ice
question
the air in this room has
answer
mass energy pressure
question
temperature is
answer
commonly expressed in joules
question
The buoyant force that acts on a 20,000-N floating ship is
answer
20,000 N
question
mass in kilograms of 1 L of water
answer
1kg
question
1L of water weight in newtons
answer
9.8N
question
in which case is the pressure you exert on the floor the greatest
answer
standing on tiptoes on one foot
question
atmospheric pressure is due to the weight
answer
of the atmosphere
question
how much does the density of air increase when it is compressed to half its volume
answer
density double when volume is halved
question
as entropy in a system increases energy in the system
answer
becomes less ordered
question
which law of thermodynamics relates to a system reading 0K
answer
3rd law
question
when disorder in a system increases entropy
answer
increases
question
which law of thermodynamics is the conservation of energy applied to thermal systems
answer
1st law
question
which law of thermodynamics relates to the direction of heat flow
answer
2nd law
question
Which warms faster when heat is applied: iron or silver
answer
silver
question
Which has the higher specific heat capacity
answer
iron
question
The amount of heat transferred to a system can be measured in
answer
either joules or calories
question
when water changes to steam energy is
answer
absorbed by the steam
question
when water changes to ice energy is
answer
released by the water
question
wavelengths radiated by high temperature source are relatively
answer
short
question
Does a gas release energy or absorb energy when it changes into a liquid?
answer
release
question
Does a solid release energy or absorb energy when it changes into a liquid?
answer
absorb
question
Does a liquid release energy or absorb energy when it changes into a gas?
answer
absorb
question
Does a liquid release energy or absorb energy when it changes into a solid?
answer
release
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