Answer: 3 cm. ... mass per unit length of 0.05 kg/m and a tension of 80 N has an amplitude of 5 cm. ... W2 28 °s The wave function for a harmonic wave on a string is y(x, t) = (0.001 m) ... (a) What average power is transmitted along the wire if the frequency is 400 Hz? (b) ...
Explanation:
Explanation:
Power is the rate of change of force dotted into displacement which is added to the force dotted to the rate of change of displacement.If the force is constant, then you get the instantaneous power is the force dotted to the instantaneous velocity.
d=18cm=0.18m thickness of board
vi=420m/s speed before entering the board
vf=320m/s speed when leaving the board
vf²=vi²+2×a×d
Acceleration a=(vf²-vi²)/2/d
a=-205.5m/s².
As expected, a is negative because the bullet is decelerated.
vf=vi+a×t
t=(vf-vi)/a=(320-420)/(-205.5)= 100/205.5=0.486s
t=0.486s=486ms