A very light ideal spring having a spring constant (force ...

[shofmannx20]

A very light ideal spring having a spring constant (force constant) of 8.2 N/cm is used to lift a 2.2-kg tool with an upward acceleration of 3.25 m/s2.
 
  If the spring has negligible length when it us not stretched, how long is it while it is pulling the tool upward?

Question 2

The Bohr radius of the hydrogen atom is 0.529  10-10 m. What is the radius of the n = 2 state?
 
  A) 0.265  10-10 m
  B) 4.23  10-10 m
  C) 1.06  10-10 m
  D) 2.12  10-10 m
  E) 0.529  10-10 m

[JaynaD87]

Answer to Question 1

3.5 cm

Answer to Question 2

D