Question

8. What is the translational kinetic energy of a 0.1 g car moving at 1 km/s?
9. What is the rotational kinetic energy of a 1 g rock rotating in a circle at 0.1 rads/s and at the end of a 2 m long string ?

1. Use the conservation of momentum to discuss what happens to a passenger in a car crash. Discuss the use of a seat belt in bringing the passenger to rest.
2. You are watching a movie about a superhero and notice that the superhero hovers in air and throws a piano at some bad guys while remaining stationary in the air. What is wrong with this picture?

Answer 1