Question

****Please answer ALL of the questions and ALL of the parts of the questions****

1. You can jump 3 m (10 feet) off of a diving board and into a swimming pool and be uninjured. However, if you jumped from the same height onto concrete it would be very bad. Use the principles of work and energy to explain this. ?

2. A 125 kg linebacker running to the right at 2.5 m/s and an 80 kg quarterback running to the left at 3 m/s collide in midair. The linebacker holds on to the quarterback and they move off together to the right at 0.35 m/s. How much thermal energy is created in this collision? ?

3. A 500 kg horse can provide a steady output power of 750 W (that is, 1 horsepower) when pulling a load; how about a 38 kg sled dog? Data shows that a 38 kg dog can pull a sled that requires a pulling force of 60 N at a steady 2.2 m/s. What is the specific power for the dog and the horse? What is the minimum number of dogs needed to provide the same power as one horse? ?

4. Describe a toy that you have seen. How does it work? What energy transformations and transfers take place when you use this toy? ?

Answer 1