Which student is using innovative problem-solving to investigate potential energy and kinetic energy?(1 point)
Responses
Pedro researches potential and kinetic energy at the library and writes a report on the relationship between them.
Pedro researches potential and kinetic energy at the library and writes a report on the relationship between them.
Lisa thinks about ways that potential energy and kinetic energy occur in her own life, chooses one, and designs a demonstration to show the relationship between the two kinds of energy.
Lisa thinks about ways that potential energy and kinetic energy occur in her own life, chooses one, and designs a demonstration to show the relationship between the two kinds of energy.
William searches the internet for experiments involving potential and kinetic energy, chooses one, and carries it out.
William searches the internet for experiments involving potential and kinetic energy, chooses one, and carries it out.
Meghan replicates a demonstration of potential energy and kinetic energy she found in her science textbook.
Lisa thinks about ways that potential energy and kinetic energy occur in her own life, chooses one, and designs a demonstration to show the relationship between the two kinds of energy.
How much more kinetic energy does a 6-kilogram bowling ball have when it is rolling at 16 mph (7.1 meters per second) than when it is rolling at 14 mph (6.2 meters per second)?
KE=12mv2
(1 point)
Responses
266.5 J
266.5 J
35.9 J
35.9 J
1.3 J
1.3 J
151.2 J
151.2 J
To calculate the kinetic energy difference between the two scenarios, we need to find the kinetic energy at 16 mph and the kinetic energy at 14 mph, and then find the difference between the two.
Given:
Mass (m) = 6 kg
Velocity at 16 mph (v1) = 7.1 m/s
Velocity at 14 mph (v2) = 6.2 m/s
Kinetic Energy (KE) = 0.5 * m * v^2
Calculate KE at 16 mph:
KE1 = 0.5 * 6 * (7.1^2)
KE1 = 0.5 * 6 * 50.41
KE1 ≈ 151.23 J
Calculate KE at 14 mph:
KE2 = 0.5 * 6 * (6.2^2)
KE2 = 0.5 * 6 * 38.44
KE2 ≈ 115.32 J
Find the difference:
KE1 - KE2 = 151.23 J - 115.32 J
KE1 - KE2 ≈ 35.91 J
Therefore, the correct answer is:
35.9 J
Where do the forces that make atoms interact come from?(1 point)
Responses
from the electric fields of charged molecules
from the electric fields of charged molecules
from the electric fields of charged subatomic particles
from the electric fields of charged subatomic particles
from the electric fields of neutral molecules
from the electric fields of neutral molecules
from the electric fields of neutral subatomic particles
from the electric fields of charged subatomic particles
When two charged particles are moving toward each other, their velocities decrease until they eventually come to a stop. What happens afterward?(1 point)
Responses
They accelerate in opposite directions.
They accelerate in opposite directions.
They bond and accelerate together.
They bond and accelerate together.
They remain in the same place without moving.
They remain in the same place without moving.
They accelerate toward each other.
They accelerate in opposite directions.
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? (1 point)
Responses
The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
The increase in the energy stored in the system is proportional to the increase in kinetic energy.
The increase in the energy stored in the system is proportional to the increase in kinetic energy.
The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.