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Physics
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Topic Topic: Motions Questions---HELP PLEASE! ? :) Post ReplyNew Question
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Galaxyfireworks
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Joined: 19 September 2007
Location: United States
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Posted: 24 September 2007 at 6:09am | IP Logged Quote Galaxyfireworks

I would really love some help with these problems,Please help me with this..I have to have it done by Monday. Thanks :)

I'm supposed to list the givens, unknowns, original equation an the solution for these problems.
I'm sorry these problems are so long, but I would be extremely grateful for any help on these problems that you can give me..

1.) Hans stands at the rim of the Grand Canyon and yodels down to the bottom. He hears his yodel echo back from the canyon floor 5.20 s later. Assume that the speed of sound in air is 340.0 m/s. How deep is the canyon at this location?

2.) The world speed record on water was set on October 8,1978 by Ken Warby if Blowering Dam, Australia. If Ken drove his motorboat a distance of 1000.m in 7.045,how fast was his boat moving a.)in m/s?  b) in mi/h?

3.)According to the World Flying Disk Federation, on April 8.2000, Jennifer threw a frisbee for a distance of 138.56 m to capture the women's record. If the Frisbe was thrown horizontally with a speed of 13.0 m/s, how long did the Frisbee remain aloft?

4.) It is now 10:29 a.m., but when the bell rings at 10:30 am, Susan will be late for French class for the third time this week. She must get from one side of the school to the other by hurrying down three different hallways. She runs down the first hallway, a distance of 35.0 m, at a speed of 3.50 m/s. The second hallway is filled with students, adn she covers its 48.0-m length at an average speed of 1.20 m/s. The final hallway is empty, and Susan sprints its 60.0-m length at a speed of 5.00 m/s.

a.) Does Susan make it to class on time or does she get detention for being late again?  Draw a distance vs. time graph of the situation.

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Prasadb
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Joined: 29 September 2007
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Posted: 29 September 2007 at 5:29pm | IP Logged Quote Prasadb

Answer 1.

Distance(s) = speed x time

Here sound travels a distance of twice the depth of the canyon.

If depth of the canyon is assumed as d metres,

2d= 340x5.2

d= 884m.

 

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