6.
A beam AB was balanced by suspending two masses
of 25 g and 16 g at the ends A and B respectively as
shown in Fig. 3.11.
A
100
B
25 g
16 g
Fig. 3.11
Determine the position of the pivot (Assume the
weight of the beam is negligible) (3 marks)

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?