Question

Ben watches a thunderstorm from his window. He sees a flash of lighting and counts 10 seconds and hears a
clap of thunder. Assume the speed of sound is 340 m/s. How far away is the lighting?

Answer 1

Answer:

a. Given: vav 340 m/sΔt=10.0 s Unknown: Δd = ? Original equation: vav = Δd /ΔtSolve: Δd = vav Δt = 340 m/s10. s = 3400 m b. For numbers this large you may wish to express the final answer in km rather than in m. Because “kilo” means 1000 then 1.000 km = 1000. m.The lightning bolt is 3.4 km away which is just a little over two miles for those of you who think in English units

Explanation:

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Answer 2

a . Given: vav 340 m/s Δt=10.0 s Unknown: Δd = ? Original equation: vav = Δd /Δt Solve: Δd = vav Δt = (340 m/s)(10. s) = 3400 m b. For numbers this large you may wish to express the final answer in km rather than in m. Because “kilo” means 1000, then 1.000 km = 1000. m. The lightning bolt is 3.4 km away, which is just a little over two miles for those of you who think in English units!