Good afternoon. Can someone please check if my answers for these questions are correct? Thanks!
1.Explain in terms of force and distance how using a ramp to load boxes into a truck makes work easier.
(Ans-) Less force is applied but the distance is longer.
2.A ball sitting on the top of a table has potential energy but no kinetic energy. Describe how potential and kinetic energy can change as the ball falls off the table to the floor.
(Ans-) When the ball falls, the kinetic energy increases and potential energy decreases..
3.Explain how the thermal energy of a swimming pool compares to the thermal energy of a lake at the same temperature.
(Ans-) The swimming pool is larger than the lake so it has more particles.
That's it for now but I will have some more later. Thanks again!
-MC
Sound pretty good to me except for (3).
A lake would be larger (more volume and more mass) than a swimming pool, so the thermal energy of the lake - which is at the same temp as the pool - would be greater.
Thanks!!
-MC
Good afternoon MC! I'll be happy to check your answers and provide explanations for each question.
1. You mentioned that using a ramp to load boxes into a truck makes work easier because less force is applied but the distance is longer. Your answer is correct! To go into more detail, using a ramp allows you to exert less force by spreading the force required to lift the boxes over a longer distance. This means you don't have to lift the boxes straight up but can push them up the ramp with less force. The total amount of work done is the same, but using a ramp reduces the force required to do the work.
2. Your answer for this question is also correct! When the ball is sitting on the top of the table, it has potential energy due to its position above the ground. As the ball falls off the table, this potential energy decreases, but its kinetic energy increases. Kinetic energy is the energy of motion, and as the ball falls, it gains speed, resulting in an increase in kinetic energy.
3. Your answer regarding the thermal energy comparison between a swimming pool and a lake at the same temperature is not entirely accurate. Thermal energy is related to the total energy of particles in an object, and its value depends on factors like mass and temperature. Comparing two objects at the same temperature, the thermal energy will be higher in the object with greater mass, assuming all other factors remain equal. However, the specific information about the size of the swimming pool and the lake you provided is not sufficient to determine a definitive comparison of their thermal energies.
If you have more questions or need further clarification, feel free to ask!