Mechanical Design Springs
5 questions, please help! Thanks(;?
6. Nuclear power plants are designed to convert nuclear energy to what type of energy? (1 point)
A. chemical
B. electrical
C. geothermal
D. mechanical
7. If no friction acts on a diver during a dive, then which of the following statements is true? (1 point)
A. The total mechanical energy of the system increases.
B. Potential energy can be converted into kinetic energy but not vice versa.
C. (KE + PE)beginning = (KE + PE)end
D. all of the above
9. Nonrenewable energy resources include all of the following EXCEPT (1 point)
A. coal.
B. hydrogen fuel cells.
C. oil.
D. uranium.
15. In what two ways can you increase the elastic potential energy of a spring? (3 points)
17. A small dog is trained to jump straight up a distance of 1.1 m. How much kinetic energy does the 7.7-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work. (3 points)
(Thanks, you guys!)
6. B
7. C
9. B
15. compressing and bending
17. the potential at that height is… PE = mgh, which is equal to the kinetic energy required to get there (7.7)(1.1)(9.8) =~ 83 Joules.
Lecture -29 Design Of Springs