Betsy uses an electric alarm clock to wake up for school. What energy transformation happens in the alarm clock to help her wake up?(1 point)
Responses
chemical energy converts to electrical energy
chemical energy converts to electrical energy
electrical energy converts to sound energy
electrical energy converts to sound energy
sound energy converts to kinetic energy
sound energy converts to kinetic energy
electrical energy converts to heat energy
electrical energy converts to heat energy
Question 16
16. An aluminum block has a starting temperature of 300oC. The block is placed into 200 milliliters of water, which has a temperature of 20oC. What heat transfer will occur?(1 point)
Responses
Heat will flow from the block to the water until both have a temperature of 300oC.
Heat will flow from the block to the water until both have a temperature of 300oC.
Heat will flow from the block to the water until both substances have the same temperature as their container.
Heat will flow from the block to the water until both substances have the same temperature as their container.
Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celcius.
Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celcius.
Heat will flow from the block to the water until both substances have a temperature of 20 degrees Celcius.
Heat will flow from the block to the water until both substances have a temperature of 20 degrees Celcius.
Question 17
17. Two samples of pure water are mixed with food coloring. One sample is red, and the other is blue. When the two water samples are combined, the red water floats on top of the blue water. Which statement best explains this result? (1 point)
Responses
The red water is warmer and is less dense.
The red water is warmer and is less dense.
The red water is colder and is more dense.
The red water is colder and is more dense.
The blue water is warmer and is more dense.
The blue water is warmer and is more dense.
The blue water is colder and is less dense.
The blue water is colder and is less dense.
Question 18
18. Which investigation would best show the transfer of heat energy without any type of matter as a medium?(1 point)
Responses
an investigation of conduction using collisions between particles
an investigation of conduction using collisions between particles
an investigation of radiation using a current within a fluid
an investigation of radiation using a current within a fluid
an investigation of conduction through movement of particles within a solid
an investigation of conduction through movement of particles within a solid
an investigation of radiation using electromagnetic waves
an investigation of radiation using electromagnetic waves
Question 19
19. Convection ovens cook food more evenly than a standard thermal oven. Which statement explains how a convection oven works?(1 point)
Responses
Hot air is transferred when heat radiates from a thermal burner.
Hot air is transferred when heat radiates from a thermal burner.
Hot air is transferred through direct molecule contact.
Hot air is transferred through direct molecule contact.
Hot air is transferred through density differences when cool air rises and hot air sinks.
Hot air is transferred through density differences when cool air rises and hot air sinks.
Hot air is transferred through density differences when hot air rises and cool air sinks.
Hot air is transferred through density differences when hot air rises and cool air sinks.
Question 20
20. People use oven mitts to avoid getting burns when moving hot metal pans while cooking. Which physical property of the metal pan requires the use of an oven mitt when it is hot?(1 point)
Responses
High solubility
High solubility
Low magnetism
Low magnetism
High thermal conductivity
High thermal conductivity
Low thermal conductivity
Low thermal conductivity
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Answer:
16. Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celsius.
17. The blue water is colder and is more dense.
18. An investigation of radiation using electromagnetic waves.
19. Hot air is transferred through density differences when cool air rises and hot air sinks.
20. High thermal conductivity
Question 16
- Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celsius.
Question 17
- The red water is warmer and is less dense.
Question 18
- An investigation of radiation using electromagnetic waves.
Question 19
- Hot air is transferred through density differences when hot air rises and cool air sinks.
Question 20
- High thermal conductivity
Question 16:
To determine the heat transfer that will occur when an aluminum block with a starting temperature of 300oC is placed into 200 milliliters of water with a temperature of 20oC, we need to consider the concept of thermal equilibrium. Heat will flow from the block to the water until both substances reach the same temperature. In this case, the heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celsius. So the correct answer is: Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celsius.
Question 17:
To explain why the red water floats on top of the blue water when they are mixed together, we need to consider the concept of density. Density is a measure of how much mass is contained in a given volume. In this case, since the red water floats on top of the blue water, it means that the red water is less dense than the blue water. Therefore, the correct answer is: The red water is less dense.
Question 18:
To investigate the transfer of heat energy without any type of matter as a medium, we need to consider the concept of radiation. Radiation is the transfer of heat energy through electromagnetic waves. So the correct answer is: An investigation of radiation using electromagnetic waves.
Question 19:
To explain how a convection oven works, we need to consider the concept of convection. Convection is the transfer of heat energy through the movement of particles in a fluid, such as air. In a convection oven, hot air is transferred through density differences when hot air rises and cool air sinks. This circulation of air helps to cook food more evenly. Therefore, the correct answer is: Hot air is transferred through density differences when hot air rises and cool air sinks.
Question 20:
To determine which physical property of the metal pan requires the use of an oven mitt when it is hot, we need to consider the concept of thermal conductivity. Thermal conductivity is a measure of how well a material conducts heat. In this case, a metal pan with high thermal conductivity would quickly transfer heat to the oven mitt and potentially burn the person handling it. So the correct answer is: High thermal conductivity.