Energy

Question 1

What is energy that travels through space in the form of waves?

Answer 1

Electromagnetic Energy

Question 2

An oven converts _____ energy to _____ energy.

Answer 2

Electrical , Heat (Thermal) <— electric
Chemical , Heat (Thermal) <— gas stove

Question 3

What is the energy of motion?

Answer 3

Kinetic Energy

Question 4

What is the energy of position?

Answer 4

Potential Energy

Question 5

What energy is associated with motion and position of objects?

Answer 5

Mechanical Energy

Question 6

What is energy that is stored in an atoms nucleus?

Answer 6

Nuclear Energy

Question 7

What is an example of a non-renewable resource?

Answer 7

Fossil fuels (Oil, Natural Gas, Coal)

Question 8

What are 2 examples of elastic potential energy?

Answer 8

Compressed basketball, stretched rubber band

Question 9

Energy stored in food would be considered….

Answer 9

Chemical Energy

Question 10

An example of an energy conversion from kinetic to thermal energy would be…

Answer 10

Friction

Question 11

Where is kinetic energy the highest?

Answer 11

Lowest part, ground floor

Question 12

What are 2 ways to increase the kinetic energy of an object?

Answer 12

The faster an object is the more kinetic energy it has.
Doubling the mass increases kinetic energy

Question 13

Kinetic energy formula?

Answer 13

KE=.5mv^2

Question 14

Where is potential energy the highest?

Answer 14

The top of the skate. FIRST HIGH JUMP

Question 15

What are 2 ways to increase the potential energy of an object?

Answer 15

Larger the weight the more potential energy it has.
The further from earths surface the more potential energy it has

Question 16

What is the formula of Potential Energy?

Answer 16

PE: mgh (g=9.8m/s)

Question 17

A rock with a mass of 450kg is sitting on a 50m ledge. What is the rocks potential energy?

Answer 17

PE: (50)(9.8)(450)
PE: 220,500J

Question 18

If a rock with a mass of 800kg was on the same cliff (50m) how would the potential energy change?

Answer 18

PE: (800)(9.8)(50)
PE: 392,000J

392,000-220,500=171,500J

Question 19

A 5kg object is thrown into the air moving at 3.5m/s. How high will the object go?

Answer 19

KE: (.5)(5kg)(3.5m/s)^2
KE: 30.6J

PE: 30.6J=(5kg)(9.8)(h) divide by 49
30.6/49
H=.62m

Question 20

Convert 250K to degrees Celsius

Answer 20

250=c+273
-273 -273
C=-23

Question 21

Convert 15c to kelvin

Answer 21

K=15+273
K=288

Question 22

How much energy will it take to raise the temperature of 15 grams of water from 20c to 50c? The specific heat of water is 4.18 j/gc

Answer 22

Q=(15g)(4.18j/gc)(30c)
Q= 1881

50-20=30
FINAL SUBTRACT INITIAL

Question 23

Warming yourself by a fire is an example of energy transfer by?

Answer 23

Thermal Radiation

Question 24

Burning your hand on a hot object an example of energy transfer by?

Answer 24

Conduction heating

Question 25

Water inside a pot getting warmer is an example of energy transfer by?

Answer 25

Convection

Question 26

A material that resists/ limits the flow of heat by conduction, convention, and radiation is an.?

Answer 26

Thermal insulator

Question 27

Material that allows heat to flow easily?

Answer 27

Conductors

Question 28

What law states that absolute zero cannot be reached?

Answer 28

Third law of thermodynamics

Question 29

What law states that energy cannot be created or destroyed?

Answer 29

First law of thermodynamics

Question 30

What law does energy become less useful as it is converted from one form to another or thermal energy flows from areas of higher temperature to areas of lower temperature?

Answer 30

Second law of thermodynamics