A hammer taps on the end of a 3.4-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 9.00 ms .What is the speed of sound in this metal?

The speed of sound in this metal is 3726 m/s

Explanation:

Length Δx = 3.4 m, Δt = time of pulses separation = 9.0 ms = 9 × 10⁻³ s = 0.009 s

Velocity of air () = 343 m/s

The time interval of the sound pulse in air (Δ) is given as:

Δ =  Δx / = 3.4 / 343 = 0.0099125 s

Δ = 0.0099 s

The time of pulse travelling through metal (Δ) = Δt - Δ

Δ = Δt - Δ =  0.0099125  - 0.009 = 0.0009125 s

Since the length of the metal is 3.4 m, the speed of sound in metal () is given as:

= Δx / Δ = 3.4 / 0.0009125 = 3726 m/s

The speed of sound in this metal is 3726 m/s

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.