Answer:
please find the answer in the attached images , in 2 parts, btw thanks for so many points. i hope my answers are correct.
Let the beam is of length L
Now the stress on both the end is same
now we can say that torque on the beam due to two forces must be zero

also we know that stress at both ends are same


Now from two equations we have

solving above equation we have

<em>so the load is placed at distance 0.4L from the end of 12 mm^2 area</em>
Center.........................
Answer:
(a) 0.33 second
(b) 6 cm/s
Explanation:
Frequency, f = 3 waves per second
wavelength, λ = 2 cm = 0.02 m
(a) The period of wave is defined as the time taken by the wave to complete one oscillation. It is the reciprocal of frequency.
T = 1 / f = 1 / 3 = 0.33 second
(b) the relation between wave velocity, frequency and wavelength is given by
v = f x λ
v = 3 x 0.02 = 0.06 m /s
v = 6 cm /s