7 Ideas Exam 2

Front 1

If the moon suddenly moved closer to Earth, angular momentum would:

Back 1

cause the moon to move faster

Front 2

A moving bicycle is prevented from falling by:

Back 2

angular momentum

Front 3

Another name for conservation of energy is:

Back 3

first law of thermodynamics

Front 4

T or F: There is more energy in the universe today than a billion years ago

Back 4

false

Front 5

100 degrees Celsius is how many degrees Fahrenheit?

Back 5

212

Front 6

Which contains the greatest amount of heat: BTU, Large calorie, small calorie?

Back 6

large calorie

Front 7

Heat moves out of a hot cup of coffee and into the cooler air. This is a result of:

Back 7

second law of thermodynamics

Front 8

Circulating water is used to cool a car's engine. The engine is being cooled by the process of:

Back 8

convection

Front 9

A Newton of force is approximately equal to:

Back 9

1/5 of a pound

Front 10

T or F: Given enough time, it's possible for an ant to have just as much power as an elephant

Back 10

false

Front 11

T or F: -273 Kelvin cannot exist

Back 11

true

Front 12

The ___ phase of matter is where atoms are held close together and not free to roll around

Back 12

solid

Front 13

The braking system is a car uses:

Back 13

Pascal's Law

Front 14

Unless some outside energy is added, heat flows:

Back 14

hot to cold

Front 15

What is the fastest way to transfer heat?

Back 15

radiation

Front 16

A large calorie is the amount of heat required to:

Back 16

raise 1 kilogram of water one degree Celsius

Front 17

The pressure exerted by the air on a person standing at sea level is about:

Back 17

14.7 or 15 pounds per square inch

Front 18

When a car has its velocity changed from 30 mph to 90 mph how much more damage can it do if it hits something?

Back 18

9 times as much damage
(90/30 = 3)
(3 squared = 9)

Front 19

Which has more power, a man who does 100 joules of work in 2 seconds or a man who does 250 joules of work in 5 seconds?

Back 19

both have the same power

Front 20

A stone on top of a building has 1280 joules of PE due to position. How many joules of KE will it have if it falls to the ground?

Back 20

1280 joules

Front 21

4.185 joules will produce 1 small calorie of heat. This is known as:

Back 21

mechanical equivalent of heat

Front 22

The state of matter formed inside stars that have turned into black holes is:

Back 22

crushed

Front 23

If a force of 30 pounds is applied to an area of 2 square inches, the pressure is:

Back 23

15 pounds per square inch

Front 24

If air is removed from the inside of a closed tin can:

Back 24

the can will collapse due to the air pressure on the outside

Front 25

An object weighs 76 pounds under water. When the object is submerged, 25 pounds of water is displaced. How much does the object weigh outside of the water?

Back 25

101 pounds (76+25=101)

Front 26

Centripetal force is:

Back 26

a real force always inward toward the center of a circle

Front 27

Applying a force to an object and moving it in the same direction the force is applied is called:

Back 27

work

Front 28

Objects expand when heated because:

Back 28

the atoms push each other apart due to their increased vibration

Front 29

T or F: Centrifugal force cannot exist without centripetal force

Back 29

true

Front 30

At what temperature is the reading on the Fahrenheit thermometer equal to the reading on the Celsius thermometer?

Back 30

-40

Front 31

A thermometer is used to directly measure:

Back 31

temperature

Front 32

How many joules of work must a person do in order to burn of 800 food calories?

Back 32

3,348,000 joules of work
(4.185 x 1000 = 4,185)
(4,185 x 800 = ans)

Front 33

If air is blown past the bottom of a flat piece of plastic, the air pressure:

Back 33

is decreased on the bottom causing the plastic to be pushed downward

Front 34

You are driving in your car at 30 mph and you open a window. Your notes fly out the window due to:

Back 34

Bernoulli's Principle

Front 35

When water starts to turn to ice:

Back 35

it becomes larger b/c the hydrogen atoms in water spread apart

Front 36

A baked potato takes much longer to cool than a loaf of bread that has the same mass, this is b/c:

Back 36

the potato has a higher specific heat than the bread

Front 37

A stone on the top of a building has 15 ft/lbs of PE due to position. How much KE will the stone have when it hits the ground?

Back 37

15 ft/lbs

Front 38

An object weighs 52 pounds above water. When submerged, some water spills over the top. How much does the object weigh when underwater?

Back 38

52 pounds minus the weight of the water that spilled out

Front 39

If an object could be cooled to the lowest possible temperature where the atoms stop moving, one would find:

Back 39

the object would become a super conductor of electricity and take on a wave nature

Front 40

A small calorie is the amount of heat required to:

Back 40

raise 1 gram of water one degree Celsius

Front 41

The process of sublimation is where:

Back 41

a solid changes directly to the gas state

Front 42

The process where heat is transferred by light waves is:

Back 42

radiation

Front 43

A motor is rated at 5 horsepower, this means:

Back 43

it can do 3,730 joules of work per second
(746 x 5 = 3,730)

Front 44

The form of energy which best fits a can of gasoline is:

Back 44

chemical energy

Front 45

When a car has its velocity changed from 20 mph to 80 mph how much more damage can it do if it hits something?

Back 45

16 times as much damage
(80/20 = 4)
(4 squared = 16)

Front 46

When heat flows out of an object by conduction, the flow can be completely stopped by:

Back 46

placing a vacuum around the object

Front 47

The earth receives heat from the sun by:

Back 47

radiation

Front 48

A pan of water in Denver, Colorado which is one mile above sea level will start to boil:

Back 48

below 100 degrees Celsius

Front 49

The phase of matter where atoms are free to roll around and take on the shape of the container is:

Back 49

liquid

Front 50

T or F: Centrifugal force is an actual force

Back 50

false

Front 51

What are 3 ways to accelerate?

Back 51

1. go faster
2. go slower
3. change direction

Front 52

If a satellite is launched staight up with a speed of 10,000 mph, the satellite will:

Back 52

fall back to Earth

Front 53

What would happen to an object if the centrifugal force were greater than the centripetal force?

Back 53

go outward

Front 54

Power is:

Back 54

work/time

Front 55

Horsepower is:

Back 55

746 joules of work in 1 second

Front 56

A Watt is:

Back 56

1 joule of work done in 1 second

Front 57

What 3 requirements must be met for work to be accomplished?

Back 57

1. force on object
2. move object a distance
3. same direction

Front 58

Which unit has the least amount of energy: foot pound, joule, erg?

Back 58

erg

Front 59

T or F: Given enough time, it is possible for an ant to do just as much work as an elephant

Back 59

true

Front 60

Stars shine by using:

Back 60

nuclear energy

Front 61

Random kinetic energy is:

Back 61

heat

Front 62

A device which measures temperature using the principle of the production of electricity is:

Back 62

a thermocouple

Front 63

Change color as they are warmed or cooled:

Back 63

liquid crystals

Front 64

Disorder or chaos is known as:

Back 64

entropy

Front 65

Materials with little to no resistance to electricity are called:

Back 65

super conductors

Front 66

One atom hitting another is: conduction, convection, or radiation?

Back 66

conduction

Front 67

Moving liquids and gases is: conduction, convection, or radiation?

Back 67

convection

Front 68

What is the only method that can be used to transfer heat through a vacuum?

Back 68

radiation

Front 69

If you want to keep something warm, would you wrap it in tin foil with the shiny side on the outside or on the inside?

Back 69

inside

Front 70

Gas state ---> liquid state:

Back 70

condensation

Front 71

Solid state ---> gas state:

Back 71

sublimation

Front 72

Liquid state ---> gas state:

Back 72

evaporation

Front 73

Fast moving atoms that have lost one or more electrons is the ___ state of matter?

Back 73

plasma

Front 74

T or F: The crushed state of matter has never been produced on Earth

Back 74

true

Front 75

T or F: The plasma phase always contains neutral particles

Back 75

false

Front 76

The best example of a material that undergoes sublimation is:

Back 76

CO² (dry ice)

Front 77

What happens to the air pressure when stormy weather approaches?

Back 77

decreases (moisture in the air)

Front 78

What happens to air pressure as one climbs a mountain?

Back 78

decreases

Front 79

With normal air pressure, how high can water be sucked up a straw?

Back 79

32 feet

Front 80

With normal air pressure, how high can mercury be sucked up a straw?

Back 80

30 inches

Front 81

Pressure equals:

Back 81

force/area

Front 82

A barometer measures:

Back 82

air pressure

Front 83

A balloon placed in a vacuum will ___ in size

Back 83

increase

Front 84

T or F: Air pressure does not just push down on an object, but it also pushes on the sides and even underneath an object

Back 84

true

Front 85

The weight of displaced liquid by a submerged object is known as the:

Back 85

buoyant force

Front 86

___ states "There is a net upward force on an object placed in a liquid or gas"

Back 86

Archimedes' Principle

Front 87

T or F: Archimedes' Principle is one of the oldest ideas in physics

Back 87

true

Front 88

T or F: A spoiler on a car is really an upside down air foil

Back 88

true

Front 89

What are 2 ways by which you can increase the buoyant force on an object?

Back 89

1. increase size of the object
2. increase weight of liquid/gas

Front 90

What happens to an object when it is placed in water if the object weighs more than the water it displaces?

Back 90

sinks

Front 91

If air is blown past the left side of a vertically hanging piece of plastic, the air pressure will:

Back 91

be greater on the right side of the plastic causing it to move to the left

Front 92

The orbital velocity of Earth is:

Back 92

18,000 miles per hour

Front 93

Name the boiling point, freezing point, and absolute zero measurements for Fahrenheit:

Back 93

BP= 212
FP= 32
AZ= -460

Front 94

Name the boiling point, freezing point, and absolute zero measurements for Celsius:

Back 94

BP= 100
FP= 0
AZ= -273

Front 95

Name the boiling point, freezing point, and absolute zero measurements for Kelvin:

Back 95

BP= 373
FP= 273
AZ= 0

Front 96

The amount of heat required to raise 1 pound of water one degree Fahrenheit is:

Back 96

BTU

Front 97

A substance that is very poor at conducting heat is called:

Back 97

an insulator

Front 98

T or F: 5 Newtons is equal to 1 pound

Back 98

true

Front 99

Today there is a great deal of excitement among scientists because:

Back 99

materials can be turned into super conductors at temperatures far
above absolute zero

Front 100

T or F: The demonstration with the bi-metal strip showed that different materials expand different amounts when heated

Back 100

true

Front 101

When you walk out of a shower and step onto a wood floor and then a soft carpet, the carpet feels warmer because:

Back 101

the carpet conducts the heat slowly from your feet

Front 102

Referring to the demonstration with the penny on the coat hanger ___ held it on the hanger

Back 102

centrifugal force

Front 103

T or F: A net force can only cause an object to move either faster or slower

Back 103

false

Front 104

A net force of 10 pounds is applied to a 2-slug object for 4 seconds. How far will the object move during the 4 seconds if the object is not moving before the force is applied?

Back 104

40 feet

Front 105

Which has more heat, a burning log in a fireplace or hot cup of coffee?

Back 105

log

Front 106

At which of the following temperatures will an ice cube be smallest: 32 degrees Fahrenheit or 20 degrees Fahrenheit?

Back 106

20 degrees Fahrenheit

Front 107

T or F: Given enough energy, an object could be cooled -1000 degrees Fahrenheit

Back 107

false