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The image contains a physics homework assignment with several questions focusing on energy, motion, and dynamics. I’ll provide a summary of each question and suggest some approaches to help you tackle them.

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### Problem Summaries and Solution Approaches

1. **Question 1:** 
   - **Topic:** Conservation of energy on an inclined plane.
   - **Details:** A crate is pushed down a ramp, starting with speed \( v_0 \) and mass \( m \). Later, more books are added, making the total mass quadruple, and you need to determine the final speed and kinetic energy at the bottom, starting with \( v_1 \).
   - **Approach:** Use the conservation of energy principle, factoring in the increase in mass. You’ll need to calculate kinetic energy at the bottom based on the new mass and initial potential energy changes due to height.

2. **Question 2:** 
   - **Topic:** Conservation of energy in a pulley system.
   - **Details:** A system with two buckets connected by a rope is set up where a 12.0 kg bucket falls from a 2.00 m height. You need to find the speed of the bucket when it hits the floor and the pulley's mass.
   - **Approach:** Apply the conservation of energy, considering gravitational potential energy converting into kinetic energy. Analyze the forces involved in the pulley system to solve for the pulley's mass.

3. **Question 3:** 
   - **Topic:** Rotational dynamics and energy methods.
   - **Details:** A mass \( m \) is suspended from a wire wrapped around a wheel with radius \( R \). As the mass descends, you need to find the wheel's mass if the object descends a height \( h \) in time \( \Delta t \).
   - **Approach (a):** Use energy methods by calculating the rotational kinetic energy of the wheel and the linear kinetic energy of the falling mass.
   - **Approach (b):** Use dynamics by analyzing the forces and torques on the system to relate the wheel’s angular acceleration to the descending mass.

4. **Question 4:** 
   - **Topic:** Conservation of mechanical energy on an incline.
   - **Details:** A hollow ball rolls down into a valley and up an incline. It starts from a height \( H_0 \) but encounters a rough path halfway up, leading to energy dissipation.
   - **Approach (a):** Calculate the height the ball reaches on the smooth incline, taking friction into account.
   - **Approach (b):** Explain why the ball doesn’t return to the initial height due to energy losses on the rough part of the incline.

5. **Question 5:** 
   - **Topic:** Orbital mechanics and work-energy theorem.
   - **Details:** You need to calculate the work required per kilogram to launch a satellite to a low Earth orbit of 160 km. The answer depends on launch location, and the problem compares the work needed to reach height and to maintain orbit speed.
   - **Approach:** Use the work-energy principle, calculating the gravitational potential energy required for the height and the additional work required to achieve orbital velocity. Justify which requires more work, considering the energy required to overcome Earth’s gravitational field and achieve the necessary orbital speed.

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Would you like detailed solutions for any specific question? 

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### Follow-up Questions

1. What are the factors affecting kinetic energy when mass increases?
2. How can energy conservation be used in systems with pulleys and weights?
3. What role does rotational inertia play in energy calculations for wheels and pulleys?
4. How does surface roughness impact energy conservation on inclined planes?
5. What are the main considerations in calculating orbital speed and altitude for satellites?

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### Tip

In energy-based problems, always identify and separate potential, kinetic, and any work done by non-conservative forces to accurately apply conservation laws.

Week 9 Physics Homework Assignment covering concepts in energy, motion, and dynamics, including conservation of energy, rotational dynamics, and orbital mechanics.

Explore solutions to physics problems on conservation of energy, pulley systems, rotational dynamics, inclined planes, and orbital mechanics. This assignment covers key topics including calculating speed, kinetic energy, and orbital work requirements. Ideal for undergraduate physics students.

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