Check My Answers Please
***=My Answers
1.Where do the forces that make atoms interact come from?
A)from the electric fields of charged molecules
B)from the electric fields of charged subatomic particles***
C)from the electric fields of neutral molecules
D)from the electric fields of neutral subatomic particles
2.When two charged particles are moving toward each other, their velocities decrease until they eventually come to a stop. What happens afterward?
A)They remain in the same place without moving.
B)They accelerate in opposite directions.***
C)They accelerate toward each other.
D)They bond and accelerate together.
3.A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnet on one end. Which statement is correct about the energy stored in the magnetic field?
A)The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.
B)The decrease in the energy stored in the system is proportional to the increase in kinetic energy. ***
C)The increase in the energy stored in the system is proportional to the increase in kinetic energy.
D)The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
4.Which of the following factors would decrease the magnetic field strength of an electromagnet?
A)using an iron core or nail
B)increasing the distances between the turns of the coil***
C)increasing the number of turns in the coil of wire
D)increasing the current or using a higher-voltage power source
5.A student is collecting data about the transfer of kinetic energy using a pitcher of lemonade. She uses the following procedure in one of the trials of her experiment:
Measure the temperature of the lemonade without ice.
Add 10 ice cubes to the pitcher.
Which step should be next in the procedure?
A)Add more ice cubes to the lemonade.
B)Measure the temperature of the lemonade after the ice has melted.***
C)Determine the mass of the lemonade with the ice.
D)Set a timer and find out how long it takes for the lemonade to get cold.
6.Ice melts in water, while remaining at 0 degrees Celsius. Which energy changes occur as it melts?
A)The potential energy of the molecules will increase, and the kinetic energy stays the same.
B)Both the kinetic and potential energy will increase.***
C)Both the kinetic and potential energy will remain the same.
D)The kinetic energy of the molecules will increase, and the potential energy remains the same.
7.Compare conduction to radiation in terms of heat transfer.
A)Both methods require contact between objects, but only conduction helps to evenly distribute energy.
B)Both methods help to evenly distribute energy, but only conduction requires contact between objects.***
C)Both methods help to evenly distribute energy, but only radiation requires contact between objects.
D)Both methods require contact between objects, but only radiation helps to evenly distribute energy.
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Great job, here's a check on your answers:
1. Correct! The forces that make atoms interact come from the electric fields of charged subatomic particles.
2. Correct! When two charged particles are moving toward each other, their velocities decrease until they eventually come to a stop. Afterward, they accelerate in opposite directions.
3. Correct! When a second bar magnet is placed near a stationary bar magnet and spins around to attach to the first magnet, the decrease in the energy stored in the system is proportional to the increase in kinetic energy.
4. Incorrect. The correct answer is D) increasing the current or using a higher-voltage power source. Using an iron core or nail, increasing the distances between the turns of the coil, and increasing the number of turns in the coil of wire would all increase the magnetic field strength of an electromagnet.
5. Correct! The next step in the procedure should be to measure the temperature of the lemonade after the ice has melted.
6. Correct! As ice melts in water, both the kinetic energy and potential energy of the molecules will increase.
7. Incorrect. The correct answer is A) Both methods require contact between objects, but only conduction helps to evenly distribute energy. Conduction involves direct contact between objects resulting in the transfer of heat, whereas radiation does not require contact but instead involves the transfer of heat through electromagnetic waves.