Forms of Energy
Energy Transformation
Conduction & Convection
Radiation & Thermal Energy
Specific Heat
100
What are five types of Energy?
Mechanical, Chemical, Potential, Kinetic, Sound, Thermal, Heat, Electrical, Light, Radiant
100
The matter the waves travel through is called...
What is the medium?
100
what happens when there is a greater difference in the energy particles?
which would be faster?
fire vs ice cube
hand vs ice cube
energy transfer goes faster
fire vs ice cube
100
When objects are cold, molecules move ____________.
slowly
100
Julian puts 1 kg of water and 1 kg of oil on the stove. The initial temperatures of both are 20 °C. The water takes more time to reach 40 °C than the oil. Which substance has a higher specific heat - water or oil?
Water
200
What are the two main types of energy?
Kinetic and Potential
200
As the speed of a falling object increases, its potential energy will _____________________.
What is decrease
200
where does convection mainly happen
Liquids and Gases
200
Radiation is heat transfer through ____________.
electromagnetic Waves
200
A student mixes 70 g of water at 80°C and 140 g of water at 20°C in an insulated cup, as shown in the diagram below.
What is the expected temperature of the water in the cup after 1 min?
A.20°C
B.40°C
C.70°C
D.80°C
B.40°C
300
Type of energy that depends on the speed of molecules.
What is thermal or heat energy
300
Provide one example of electromagnetic energy.
What are light waves?
What are microwaves?
What are x-rays?
What are radio waves?
300
Which of the following is NOT a way that thermal energy is transferred?
a. Conduction
b. Radiation
C. Condensation
C. Condensation
300
Which is an example of radiation?
1. Using a microwave to heat food
2. Cooking pancakes on a pan
1. Using a microwave to heat food
300
What is the change in temperature of an object whose initial temperature is 40 °C and reaches a final temperature of 65 °C?
25 °C
400
The law of conversation states...
What is energy can neither be created or destroyed.
400
The energy transformation that occur in a guitar. (______ to ______)
What is mechanical to sound
400
Warm objects have _____ moving particles, then they touch something _____, energy is transferred to the cold object that has ______ moving particles.
warm= faster
touch something cold with slower moving particles
400
Do humans give off radiation?
Yes, all objects, including human bodies give off radiation.
400
A student heats 200 g of water from 20°C to 70°C. How much heat did the student add to the water if the specific heat for water is 4.2 J/g • °C?
A.10,000 J
B.14,000 J
C.42,000 J
D.76,000 J
C.42,000 J
500
The ability to do work:
a. Convection
b. Thermal
c. Energy
c. Energy
500
The energy transformations that occur in a nuclear power plant. (_____ to _____ to _____)
What is nuclear to thermal to electrical.
500
True or false: Conduction produces heat when you rub your hands together
False, friction causes heat when you rub your hands together. Conduction is the transfer of heat between two objects.
500
This is the amount of heat necessary to raise one mass unit of a substance by one temperature unit.
What is specific heat?
500
Two U.S. quarters, initially at the same temperature, are heated with a flame. One of the quarters was made before 1965 and is composed of silver. The other quarter was made after 1965 and is composed mostly of copper. What information is needed to determine which quarter will heat up faster?
A.the specific heats of the metals and the mass of each coin
B.the initial temperature of the coins and the mass of each coin
C.the temperature of the flame and the specific heats of the metals
D.the initial temperature of the coins and the temperature of the flame
A.the specific heats of the metals and the mass of each coin