Echo Lake

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New York, NY, Lake Placid Club, Dinner at Echo Lake Real Photo Postcard
New York, NY, Lake Placid Club, Dinner at Echo Lake Real Photo Postcard
$24.95
c.1905 RPPC Arden Echo Lake Central Valley NY Orange County
c.1905 RPPC Arden Echo Lake Central Valley NY Orange County
$22.00
Millwood NY - ECHO LAKE - Postcard near Chappaqua/Mt Kisco
Millwood NY - ECHO LAKE - Postcard near Chappaqua/Mt Kisco
$10.00
Lake Pleasant NY~From Miss Higgins~Observatory~Echo Lake~X Below Woods~1921 RPPC
Lake Pleasant NY~From Miss Higgins~Observatory~Echo Lake~X Below Woods~1921 RPPC
$9.60
Echo Lake Arden CENTRAL VALLEY NY Huld undivided postcard 3240
Echo Lake Arden CENTRAL VALLEY NY Huld undivided postcard 3240
$8.99
A View of a Boat Dock on Echo Lake, Warrensburg NY
A View of a Boat Dock on Echo Lake, Warrensburg NY
$7.95
Fishing in Echo Lake, Warrensburg NY
Fishing in Echo Lake, Warrensburg NY
$7.95
Lake Mohonk NY Echo Rock Near Mint Unused 1910
Lake Mohonk NY Echo Rock Near Mint Unused 1910
$9.00
Westkill NY - ECHO NOTCH LAKE - RPPC Postcard Catskills/West Kill
Westkill NY - ECHO NOTCH LAKE - RPPC Postcard Catskills/West Kill
$7.00
Central Valley, NY  Y.W.C.A. Summit Lake Camp  Echo Lodge 1930s
Central Valley, NY Y.W.C.A. Summit Lake Camp Echo Lodge 1930s
$3.00
Echo Lodge Summit Lake Camp Y.M.C.A. Central Valley NY Postcard  - New York
Echo Lodge Summit Lake Camp Y.M.C.A. Central Valley NY Postcard - New York
$2.68
WARRENSBURG NY
WARRENSBURG NY "ECHO LAKE BATHING BEACH" LINEN POSTCARD 1934 CANCEL
$1.99



physics question!! helpp!!?

Anna was on vacation and came across an
echo lake. Wanting to know how far she had
to swim to get across the lake to the other
side, she yelled across “Hello!”
How wide is the lake if 4 seconds later she
heard her own echo? Assume that the tem-
perature is 20◦C and the speed of sound is
344 m/s. Answer in units of m.

At 20 °C is ρ20 = 1.204 kg/m3, Z20 = 413 N·s/m3, and c20 = 343 m/s

So, using 343 m/s because of the air temperature of 20 degrees:

343 * 4 = 1372

So, the lake is 1372 m.



Echo Lake - In Dreams (official video)



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