Fill in the blank
A burning candle changes ? Energy into ?
The choice options are:
Gravitational
Electrical
Potential
Heat
A burning candle changes potential energy into heat.
Which forms of energy can you identify here?
It’s a light bulb
A: Sound
B: Thermal
C: Mechanical
D: Nuclear
E: Light/Radiant
The forms of energy that can be identified in a light bulb are:
- Thermal energy (heat) generated from the light bulb
- Light/radiant energy emitted from the light bulb
A 20 pound barbell is brought from earth to the International Space Station(ISS). How does this trip affect the gravitational force between the two ends of the barbell? Assume the distance between the barbell end masses does not change.
A) The gravitational force between the ends decreases.
B The gravitational force between the ends increases.
C The gravitational force between them doubles.
D The gravitational force between them decreases by one half.
E The gravitational force between the ends remains the same.
The gravitational force between the two ends of the barbell will remain the same.
The gravitational force between two objects depends on the mass of the objects and the distance between them. In this case, bringing the barbell from Earth to the ISS does not change the mass of the barbell or the distance between its ends, so the gravitational force between the ends remains constant.
Fills in the blanks
Heat is a measure of how much energy flows from ? objects to ? objects. It ? the same thing as temperature
A: Hot, Cold, is not
B: Hot, Cold, is
C: Cold, Hot, is not
D, Cold, Hot, is
Heat is a measure of how much energy flows from hot objects to cold objects. It is not the same thing as temperature.
So the correct option is:
A: Hot, Cold, is not
Room temperature soda cans are placed in a cooler and taken to a football game
Which of the two statements best describes the characteristics that contribute to keeping the sodas cold?
The color of the ice chest contributes to keeping the sodas cold.
The gap of air in between the layers of plastic contributes to keeping the sodas cold.
The shape of the ice chest contributes to keeping the sodas cold.
The thickness of material contributes to keeping the sodas cold.
The size of the ice chest contributes to keeping the sodas cold.
The two statements that best describe the characteristics that contribute to keeping the sodas cold are:
1. The thickness of material contributes to keeping the sodas cold. Thicker materials provide better insulation and help retain the cold temperature inside the cooler.
2. The air gap in between the layers of plastic contributes to keeping the sodas cold. Air is a poor conductor of heat, so having an air gap between layers of plastic can also help with insulation and keeping the cold temperature inside the cooler.
After an hour in the cooler, the sodas get colder and the ice gets warmer. Which of the following explains these changes correctly?
The coldness is leaving the ice and going into the soda.
The heat is leaving the ice and going into the soda.
The coldness is leaving the soda and going into the ice.
The heat is leaving the soda and going into the ice.