## Exercise 2.1 A

Define the oscillation time of the pendulum.

Answer: 2,5 s

## Exercise 2.1 B

Define the frequency of the pendulum.

Answer: 0,41 Hz

## Exercise 2.1 C

Study how the amplitude of the motion affects to the oscillation time.

Answer: Examining the vibrations, it is noticed that there is not much difference, even though the amplitude varies.

## Exercise 2.1 D

Investigate the effect of the pendulum length on the oscillation time. Present the results graphically and determine from the graphical representation of the pendulum length when the oscillation time is 1 sec.

Answer: 0,25 - 0,26 m

## Exercise 2.1 E

Investigate the oscillation time of a spring effected by different mass. Show the results graphically and determine from the graph of the mass when the oscillation time of the spring is 1 s.

Answer: 305 g - 320 g

## Exercise 2.1 F

How much is the measured oscillation time different from the predicted time (in seconds and percentages) of the math pendulum?

Answer: −0,005 ?; −0,2 %

## Exercise 2.2 A

Define the value of the force constant k of the spring.

Answer: $13\ N/m$

## Exercise 2.2 B

Specify the value of the force constant k of the spring.

Tip 1: The oscillation time of a spring can be determined from the equation $T=2\pi\sqrt{\frac{m}{k}}$
Tip 2: Place the observation values in the $(T^2,m)$ –coordinate system.
Answer: $12\ N/m$

## Exercise 2.2 C

Specify the value of the force constant k of the spring.

Answer: 12 N/m

## Exercise 2.3 A

Determine the critical angle of the total reflection.

Answer: Approximately 42,5°