Science Test 3

a bubble of air released from the bottom of a lake

becomes larger as it rises

which is larger fahrenheit or celsius

celsius

a substance can absorb heat energy by the process of

conduction, convection, radiation

on a windy day, atmospheric pressure

decreases

when the same amount of heat is added to each of the two containers of water, the temperature increase in each will

depend on the amount water in each

when gas in a container is squeezed to half its volume, its density

doubles

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

downstairs

in a hydraulic device it is impossible for the

energy output to exceed energy input

when water at 4C is heated it expands when water at 4C is cooled it

expands

which is larger fahrenheit or kelvin

fahrenheit

In which of the following is intermolecular bonding weakest

gases

if the volume of an object were to double while its mass stays the same its density would

halve

if a good absorber of radiant energy were a poor emitter its temperature compared with its surroundings would be

higher

when a boat sails from fresh water to salt, the boat will float

higher in the water

compared to a giant iceberg, a hot cup coffee has

higher temperature, but less thermal energy

Which of the following normally warms up faster when heat is applied

iron

when you squeeze a party balloon to 0.25 its volume the pressure in the balloon

is 4 times greater

your feet feel warmer on a rug than on a tile floor because the rug

is a better insulator than tile

ice cubes submerged at the bottom of a liquid mixture indicate that the mixture

is less dense then ice

water with air bubbles flows through a pipe that gets narrower in the narrow region the water gains speed and the bubbles are

larger

the energy involved in a phase change is called the

latent heat

it takes longer time to cook eggs by boiling in the mountains compared to sea level is because

low boiling temperature of water

a substance that heats up relativity quickly has a

low specific heat capacity

Reason why people can walk barefoot on red hot coals of wood without burning their feet

low thermal conductivity of the coals

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

temperature

heat energy travels from an object with a high

temperature to an object with lower temperature

the reason a life jacket helps you float is

the density of both you and th jacket together is less than your density alone

the reason a life jacket helps you float is

the density of both you and the jacket together is less than your density alone

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

the density of salt water exceeds the density of the egg

Why Sparklers don't harm you

the energy per molecule is high, but the total energy transferred is small

does a 3 meter deep lake or a 6 meter deep small pond exert more pressure on a dam

the six meter deep small pond

the volume of water displaced by a floating 20 ton boat is

the volume of 20 tons of water

two cans are placed apart on straws when air is blown in between the cans, what will they do

they will move toward each other

if you squeeze an air filled balloon to one third its volume air pressure inside is about

three times as much

heat will not flow spontaneously from a colder to a warmer body

true

which has the higher specific heat water or land

water

the greater the temperature difference of two objects the more rapidly heat energy will be transferred

True

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

no

two people are drinking soda using straws. do they suck the soda up. could they drink soda this way on the moon

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

one celsius unit is equivalent to

one Kelvin degree

if a hole is punched in the side or bottom of a boat water spurting in will be

perpendicular to the surface

what happens to the internal water pressure in a narrowing pipe of moving water

pressure is less

the lowest temperature possible in nature is

-273 degrees C

one liter of water has a mass of

1 kg

which of these has the greatest density

100kg of lead

mercury has density of 13.6 grams per cubic centimeter how much heaver is it than one cubic centimeter of water

13.6 times heaver

before ice can form on a lake, all the water in the lake must be cooled to

4 degrees C

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

4C

why will spraying fruit trees with water before frost help to protect the fruits from freezing

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

why is it important to protect water pipes so they do not freeze

Because water expands when it is frozen and this increased pressure will cause the pipes to break.

Bermuda is close to north Carolina but unlike north Carolina it has a tropical climate year round. why?

Bermuda is an island. the surrounding water warms it when it might be too cold, and coolsit when it might be too warm

which is larger celsius or kelvin

Celsius

absolute zero refers to 0C

False it is 0k

would it be slightly more difficult to draw soda through a straw at sea level or on top of a very high mountain

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.

which has the greater amount of internal energy an iceberg or a cup of hot coffee

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.

why is an umbrella in danger of being turned inside out on a windy day

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.

the reason a person finds it easier to float in salt water compared with fresh water is that in salt water

a smaller volume of water id displaced

When a liquid changes phase to a gas it

absorbs energy

an umbrella tends to move upwards on a windy day principally because

air pressure is reduced over the curved top surface

if you want to cook eggs by boiling them while in the mountains, then compared to sea level cooking you should

boil the eggs for a longer time

which has the greater density a lake full of water or a cup full of lake water

both have the same density

at which hole in the cup is there more pressure on the water shooting out of the hole

bottom hole

In which situation below did conduction take place

burning yourself on a hot stove

when an object is partly or wholly immersed in a liquid, it is buoyed up

by a force equal to the weight of liquid desplaced

when a sample of 0C water is heated it first

contracts

when a bimetallic bar made off copper and iron strips is heated the bar bends towards the iron strip the reason for this is

copper expands more than iron

If earth radiated more energy than it absorbs from the sun earths average temperature would

decrease

which of the following does not emit radiation

everything emits radiation

when a sample of 4C water is cooled it

expands

a boat loaded with scrap iron floats in a swimming pool. when iron is thrown overboard, the pool level will

fall

a floating ice cube contains small pieces of iron after melting the water level will

fall

radiation can travel in a vacuum

false

sand has higher heat capacity than water

false water has a much higher heat capacity

ring is hot the room temperature ball

fits into the hole with more room to spare

when a hot cup is filled with cold water the direction of heat flow is

from the cup to the water

suppose you rapidly stir some raw eggs with an eggbeater the temperature of the eggs will

increase

as a system becomes more distorted, entropy

increases

when work is done on a system compressing air in a tire pump for example the temperature of the system

increases

your garage gets messier each week in this case the entropy of your garage is

increasing

a suction cup sticks to a wall it is

pushed to the wall by the atmosphere

the silver coating on the glass surfaces of thermos bottle reduces energy that is transferred by

radiation

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

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

When a gas is changed to a liquid phase, the gas

releases energy

heat energy is measured in units of

remains the same

when an ice cube in a glass of water melts the water level

remains the same

when stringing telephone lines between poles in the summer it is advisable to allow the lines to

sag

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

salt water

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

same pressure on each

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

slow the flow of heat from inside the house to the outside

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

supports this knowledge

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

the pressure due to waters change in momentum can be much greater than the waters internal pressure

consider two mercury barometers one with twice the cross sectional area of the other. neglecting capillary mercury in the smaller tube will rise

the same height as in the larger tube

when a chocolate bar is cut inhale its density is

unchanged

completely submerged object always displaces its own

volume of fluids

during a very cold winter, water pipes sometimes burst the reason for this is

water expands when freezing

A dam is thicker at the bottom that at the top because

water pressure is greater with increasing depth

atmospheric pressure is caused by the

weight of Earths atmosphere

a balloon is buoyed up with a force equal to the

weight of air it displaces

a fish normally displaces its own

weight of water and volume of water

is there a buoyant force acting on your classmate at this moment?

yes but it is insignificant compared with their weights