6. [2pt]
In the lab Springs, a student sits on a bosun's chairsuspended by a spring. If the spring
has a spring constant, k = 1020 N/m, and is stretched by 0.5 m,how
much energy is stored in the spring?
Correct, computer gets: 127.5 J
7. [2pt]
The student gets off the bosun's chair very carelessly and all theenergy in the
spring is converted into the kinetic energy of the seat. The massof the seat is
1 kg. Once the spring has fully contracted, what is the speed ofthe seat?
Answer:Â Â
8. [2pt]
Unfortunately, the student was hit on the head by the seat as itflew up. Some of the kinetic energy of the seat will be convertedinto
gravitational potential energy; neglect this. Assume the impactspeed of
the seat is the same as in the previous question. If the seat comesto rest in 0.01 s as
it hits the student's head, what force would the seat exert on thestudent's
head?
Be safe. Remember: get off the bosun's chaircarefully!
Answer:Â Â
I GOT QUESTION 6, BUT NOT 7 AND 8.
