# physics

An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 355, 1410, and 5380 m/s, respectively. The sound travels a distance of 140 m in each medium. (a) After the first sound arrives, how much later does the second sound arrive? (b) After the first sound arrives, how much later does the third sound arrive?

1. 👍
2. 👎
3. 👁
1. t1= s/v1 = 140/355 = 0.394 s.
t2 = s/v2 = 140/1410 = 0.099 s.
t3 =s/v3 = 140/5380 = 0.026 s.
Δt1 =0.099 – 0.026 = 0.073 s.
Δt2 = 0.394 – 0.026 = 0.368 s.

1. 👍
2. 👎

## Similar Questions

1. ### physics

A cat walks along a uniform plank that is 4 m long and has a mass of 7 kg. The plank is supported by two sawhorses, one 0.44 m from the left end of the board and the other 1.5 m from its right end. When the cat reaches the right

2. ### physics

a 500 N person stands on a uniform board of weight 100 N and length 8 m. the board is supported at each end. if the support force at the right end is three times that at the left end, how far from the right end is the person?

3. ### Helpppppp

Use benchmarks to estimate the sum. three-fifths+start fraction 3 over 17 end fraction A. 2 B. one-half C. 1 D. 0 Estimate the difference. 6five twelvths – 4one ninth A. 2 B. 3 C. 1 D. 4 Estimate the product. 6four

4. ### Math I NEED HELP

So I need the answers ASAP Question 1 of 7 Ken finished one-fifth of his chores before breakfast and three-fifths of his chores after breakfast. What fraction of his chores does he have finished altogether? A. Start Fraction 4

1. ### physics

In a thermonuclear device, the pressure of 0.050 liters of gas within the bomb casing reaches 4 0 x 10^6 atm. When the bomb casing is destroyed by the explosion, the gas is released into the atmosphere where it reaches a pressure

2. ### Physics

A bar of aluminum (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 75.5°C while the opposite end is at 30.0°C. Find the temperature at the

3. ### Physics !

Sound enters the ear, travels through the auditory canal, and reaches the eardrum. The auditory canal is approximately a tube open at only one end. The other end is closed by the eardrum. A typical length for the auditory canal in

4. ### physic

An air column in a glass tube is open at one end and closed at the other by a movable piston. The air in the tube is warmed above room temperature, and a 350 Hz tuning fork is held at the open end. Resonance is heard when the

1. ### physics

A pole AB of length 10m and weight 600N has its centre of gravity 4m from the end A, and lies on horizontal fround.calculate the force required to begin to lift the end.why would this force applied at the end A,not be sufficient

2. ### plz helpppppppp

Use benchmarks to estimate the sum. three-fifths+start fraction 3 over 17 end fraction A. 2 B. one-half C. 1 D. 0 Estimate the difference. 6five twelvths – 4one ninth A. 2 B. 3 C. 1 D. 4 Estimate the product. 6four

3. ### Chemistry

1.Describe the apparent relationship between H30+ and OH- concentrations when an endpoint is reached in an acid-base titration 2. The indicated end-point of an acid-base titration seldom occurs at a pH of 7. What determines the pH

4. ### Physics (3)

An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge? A. B. C Right end