Isn't that just friction ? The spring is attached to the mass on the bottom. The spring pulls the bigger block and the top mass receives a force in the other direction due to friction.
200 x amplitude= 0.4 x 1.8 x 9.81
But the answer includes the big mass as well. Why ? Isn't it frictionless ? Doesn't friction depend on the weight of the small block ?
Yes I can solve them. But that's not the question. In the second question it is assumed that the amplitude is 5 cm. There's is nothing to calculate. It's just given. But shouldn't it be 10 ? And it's the same for the first one. 5 cm amplitude is stated. It's not calculated.
A vertical spring stretches 9.6 cm when a 1.3 kg block is hung from its end. (a) Calculate the spring constant.This block is then displaced an additional 5.0 cm downward and released from rest. Find the (b) period, (c) frequency, (d) amplitude, and (e) maximum speed of the resulting SHM.
And...
In question 37 of halliday and resnick a spring at rest length is pulled 10 cm down. And the answer say its amplitude is 5 cm. Okay. But then in question 73 a spring is stretched 9.6 cm by being hung from a weight, and then another 5 cm by hand. But this time the amplitude is 5 cm. Why ?
Here are three sets of values for the spring constant, damping constant, and mass for the damped oscillator of Fig. 15-16. Rank the sets according to the time re-quired for the mechanical energy to decrease to one-fourth of its initial value, greatest first.
This is from halliday and resnick...