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8. The pendulum in the diagram below swings from position A to B. If we don’t consider friction, what happens to the total mechanical energy as the pendulum swings from position A to position B? (1 point) Responses It declines It declines It remains the same It remains the same It is not conserved It is not conserved It becomes greater. It becomes greater. Question 9 9. Rebecca climbs the ladder of a large water slide, waits her turn at the top, and then slides down the slide into a pool. Which answer best describes the energy changes during her time on the slide?(1 point) Responses potential → mechanical → kinetic potential → mechanical → kinetic kinetic → potential → kinetic kinetic → potential → kinetic potential → kinetic → potential potential → kinetic → potential kinetic → mechanical → potential kinetic → mechanical → potential Question 10 10. Kim is upstairs, but walks downstairs to the kitchen for a snack. Which statement correctly describes the types of energy she has at the top of the stairs and as she walks down the stairs?(1 point) Responses potential energy at the top of the stairs; kinetic energy as she walks down potential energy at the top of the stairs; kinetic energy as she walks down kinetic energy at the top of the stairs; kinetic energy as she walks down kinetic energy at the top of the stairs; kinetic energy as she walks down potential energy at the top of the stairs; potential energy as she walks down potential energy at the top of the stairs; potential energy as she walks down kinetic energy at the top of the stairs; potential energy as she walks down kinetic energy at the top of the stairs; potential energy as she walks down Question 11 11. The picture below shows a pinwheel that Bobby has in his front yard. Often Bobby sees his pinwheel spinning, but other times it does not spin. Which statement best explains what makes his pinwheel spin? (1 point) Responses Energy from the wind pushes on the wheel causing the pinwheel to move. Energy from the wind pushes on the wheel causing the pinwheel to move. The Sun heats up the pinwheel, causing it to turn. The Sun heats up the pinwheel, causing it to turn. Energy from the ground shakes the wheel causing the pinwheel to move. Energy from the ground shakes the wheel causing the pinwheel to move. The colors on the wheel repel one another, causing it to turn. The colors on the wheel repel one another, causing it to turn. Question 12 12. Jennifer uses different forms of energy when she gets ready for school in the morning. Which table below correctly shows the forms of energy used in Jennifer's actions?(1 point) Responses Question 13 13. The picture illustrates the solar panels that power all of the appliances in Joshua's house. What energy transformations occur that enable Joshua to bake cookies for his family in the oven? (1 point) Responses heat energy → chemical energy → light energy heat energy → chemical energy → light energy light energy → electrical energy → chemical energy light energy → electrical energy → chemical energy heat energy → light energy → heat energy heat energy → light energy → heat energy light energy → electrical energy → heat energy light energy → electrical energy → heat energy Question 14 14. As energy is transferred or conserved, some of that energy becomes unavailable to do work. What happens to this unavailable energy?(1 point) Responses The unavailable energy is destroyed The unavailable energy is destroyed The unavailable energy is given off as heat The unavailable energy is given off as heat The unavailable energy is conducted The unavailable energy is conducted The unavailable energy is given off as microwaves The unavailable energy is given off as microwaves Question 15 15. 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 electrical energy converts to heat energy electrical energy converts to heat energy electrical energy converts to sound energy electrical energy converts to sound energy chemical energy converts to electrical energy chemical energy converts to electrical energy sound energy converts to kinetic energy sound energy converts to kinetic 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 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. 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 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 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. 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 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. 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. 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 radiation using electromagnetic waves an investigation of radiation using electromagnetic waves 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 conduction using collisions between particles an investigation of conduction using collisions between particles 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 through direct molecule contact. Hot air is transferred through direct molecule contact. 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 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 Low thermal conductivity Low thermal conductivity Low magnetism Low magnetism High solubility High solubility High thermal conductivity High thermal conductivity Skip to navigation

Answer 1

Here are the answers to your questions:

Question 8: If we don’t consider friction, what happens to the total mechanical energy as the pendulum swings from position A to position B?

• Answer: It remains the same.

Question 9: Which answer best describes the energy changes during Rebecca's time on the slide?

• Answer: potential → mechanical → kinetic

Question 10: Which statement correctly describes the types of energy Kim has at the top of the stairs and as she walks down?

• Answer: potential energy at the top of the stairs; kinetic energy as she walks down

Question 11: Which statement best explains what makes Bobby's pinwheel spin?

• Answer: Energy from the wind pushes on the wheel causing the pinwheel to move.

Question 12: (The question does not provide enough information to answer this query; please provide the table or options.)

Question 13: What energy transformations occur to enable Joshua to bake cookies for his family in the oven?

• Answer: light energy → electrical energy → chemical energy

Question 14: What happens to the unavailable energy?

• Answer: The unavailable energy is given off as heat.

Question 15: What energy transformation happens in the alarm clock to help Betsy wake up?

• Answer: electrical energy converts to sound energy.

Question 16: What heat transfer will occur when an aluminum block at 300°C is placed into 200 milliliters of water at 20°C?

• Answer: 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: Which statement best explains why the red water floats on top of the blue water?

• Answer: The red water is warmer and is less dense.

Question 18: Which investigation would best show the transfer of heat energy without any type of matter as a medium?

• Answer: an investigation of radiation using electromagnetic waves.

Question 19: Which statement explains how a convection oven works?

• Answer: Hot air is transferred through density differences when cool air rises and hot air sinks.

Question 20: Which physical property of the metal pan requires the use of an oven mitt when it is hot?

• Answer: High thermal conductivity.

Let me know if you need clarification on any of these answers or if you have any more questions!