1)
Study the scenario.
System 1 has a large number of particles, moving slowly on average. System 2 has a smaller number of particles, but they are moving faster on average.
Which system has a higher temperature?
System 2 has a higher temperature because the particles are moving with greater speed. The particles in System 2 have greater kinetic energy than System 1.
System 1 has a higher temperature because there are more particles. A greater number of particles have more kinetic energy than a smaller number of particles.
System 1 has a higher temperature because the particles are moving slowly. The particles in System 1 have greater kinetic energy than System 2.
There is not enough data to tell. The larger number of particles in System 1 may or may not outweigh the increase in movement in System 2.
2)Study the scenario.
A rock falls off the edge of a cliff. The system consists of the rock, the cliff, and the Earth.
Which choice best describes the changes in kinetic and potential energy
Before the rock falls, all the energy is stored as potential energy. The kinetic energy increases as the rock falls because its speed increases. The potential energy decreases as the rock falls because its position relative to the ground decreases. The total energy remains constant.
Before the rock falls, all the energy is stored as potential energy. The kinetic energy increases as the rock falls because its speed increases. The potential energy increases as the rock falls because its position relative to the ground increases. The total energy increases.
Before the rock falls, all the energy is stored as kinetic energy. As the rock falls, the kinetic energy remains constant because the rock’s acceleration remains constant. The potential energy decreases as the rock falls because its position relative to the ground decreases. The total energy decreases.
Before the rock falls, all the energy is stored as potential energy. The potential energy remains the same because the Earth’s pull on the rock does not change. The kinetic energy remains the same because the acceleration remains constant. The total energy remains constant.
3)Which of these correctly describes whether a girl holding a ball in the same position is doing work on the ball?
The girl is doing no work on the ball because she is exerting a net force on the ball.
The girl is doing no work on the ball because the ball is not displaced.
The girl is doing work on the ball because the energy in her muscles changed, even though the ball is not displaced.
The girl is doing work on the ball because the energy of the ball changed, even though it is not displaced.
4)Study the scenario.
A person is standing on a bridge, attached to a bungee cord. The person steps off the bridge and falls down. The isolated system consists of the person, bridge, bungee cord, and the Earth, ignoring friction and air resistance. The amount of energy in the system is 18,000 J when the person is standing on the bridge. At some point during the fall, 6,000 J of energy has been transformed into kinetic energy because the person is moving. Additionally, 3,000 J of energy has been transformed into elastic potential energy because the bungee is stretching. (Air resistance is negligible.)
Which choice best describes the amount and form of the rest of the energy at this point?
There are exactly 9,000 J of thermal energy is the system because the person is heating up as he falls and the total energy must add up to 18,000 J because energy is always conserved.
There are slightly more than 9,000 J of gravitational potential energy in the system because the person is at some position above the ground and the total energy must be slightly more than the initial energy because energy increases as it is transformed.
There are exactly 9,000 J of gravitational potential energy in the system because the person is at some position above the ground and the total energy must add up to 18,000 J because energy is always conserved.
There are slightly less than 9,000 J of gravitational potential energy in the system because the person is at some position above the ground and the total energy must be slightly less than the initial energy because energy is lost as it is transformed.
-Need help with these 4 questions, thanks!
1. Answer: System 2
4. Answer: There are exactly 9,000 J of gravitational potential energy in the system because the person is at some position above the ground and the total energy must add up to 18,000 J because energy is always conserved.
only know those 2. yours truly
1) System 2 has a higher temperature because the particles are moving faster on average. It's like comparing a slow-motion party to a high-speed chase. The particles in System 2 are zooming around like cheetahs, while the particles in System 1 are strolling like snails. So, if you want some hot stuff, go for System 2!
2) Before the rock falls, it's sitting pretty with all its energy stored as potential energy. But as it takes the plunge, its potential energy starts to decrease because it's getting closer to the ground. However, don't hit the panic button just yet, because the rock is gaining something else - kinetic energy! Its speed increases as it falls, which means it's getting more and more hyped up. So, in a nutshell, potential energy goes down, while kinetic energy goes up. It's like a rock concert that's getting wilder by the second!
3) Sorry, but the girl is actually slacking off when it comes to doing work on the ball. Work is done when a force is applied to an object and it causes it to move a certain distance. However, in this case, the ball stays put, so there's no displacement. It's like trying to push a stubborn mule that refuses to budge. So, no work is being done on the ball. Poor girl, she needs to work on her work ethic!
4) At this point in the fall, we have the person zipping through the air, with 6,000 J of energy transformed into kinetic energy. Additionally, the bungee cord is stretching and storing 3,000 J of energy as elastic potential energy. But what about the rest? Well, we can't forget about our good ol' buddy, gravitational potential energy, which is like the VIP of energy in this scenario. It's hanging out at slightly less than 9,000 J because the person is at a certain height above the ground. So, to summarize, we have kinetic energy, elastic potential energy, and a slightly diminished gravitational potential energy, keeping the energy party going!
1) System 2 has a higher temperature because the particles are moving faster on average, indicating greater kinetic energy.
2) Before the rock falls, all the energy is stored as potential energy. As the rock falls, its potential energy decreases because its position relative to the ground decreases. At the same time, the rock's kinetic energy increases as its speed increases. The total energy of the system remains constant.
3) The girl is doing no work on the ball because the ball is not displaced. In order for work to be done on an object, there must be a transfer of energy resulting from a net displacement of the object in the direction of the applied force.
4) At this point, there are exactly 9,000 J of gravitational potential energy in the system because the person is at some position above the ground. The total energy of the system must add up to the initial energy of 18,000 J because energy is always conserved. The remaining energy not accounted for by kinetic and potential energy is assumed to remain in the same form, which in this case is gravitational potential energy.
1) To determine which system has a higher temperature, we can look at the average speed of the particles. System 2 has particles that are moving faster on average, indicating that they have greater kinetic energy. Kinetic energy is directly related to temperature, so System 2 has a higher temperature.
2) Before the rock falls, all the energy is stored as potential energy because it is at a higher position relative to the ground. As the rock falls, its potential energy decreases because its position relative to the ground decreases. At the same time, its kinetic energy increases because its speed increases. Since energy is conserved, the total energy remains constant.
3) In order for work to be done on an object, the object must be displaced by a force. In this case, the girl is holding the ball in the same position, so there is no displacement. Therefore, the girl is not doing any work on the ball.
4) At this point during the fall, the 6,000 J of energy has been transformed into kinetic energy and the 3,000 J of energy has been transformed into elastic potential energy. This accounts for 9,000 J of energy. Since energy is conserved, the rest of the energy must still be present in the system. Therefore, there are exactly 9,000 J of gravitational potential energy in the system because the person has not yet reached the ground. The total energy must add up to the initial energy of 18,000 J.