A 12.0-N object is oscillating in simple harmonic motion at the ...

[LCritchfi]

A 12.0-N object is oscillating in simple harmonic motion at the end of an ideal vertical spring.
 
  Its vertical position y as a function of time t is given by y(t) = 4.50 cm cos(19.5 s-1)t - /8.
  (a) What is the spring constant of the spring?
  (b) What is the maximum acceleration of the object?
  (c) What is the maximum speed that the object reaches?
  (d) How long does it take the object to go from its highest point to its lowest point?

Question 2

The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?
 
  What will be an ideal response?

[b614102004]

Answer to Question 1

(a) 466 N/m (b) 17.1 m/s2 (c) 0.878 m/s (d) 0.161 s

Answer to Question 2

4.79 s

[LCritchfi]

Wow, this really help

[raili21]

Thanks for the timely response, appreciate it