Saturday

December 20, 2014

December 20, 2014

Posted by **patti** on Monday, March 18, 2013 at 12:46pm.

- college physics -
**drwls**, Monday, March 18, 2013 at 1:15pmOK, here is how to do that:

How fast was the coin going after 1 second? V(1) = 1*t = 9.8 m/s

After 2 seconds? V(2) = 2*t = 19.6 m/s

How fast was the coin going when it hit the water? V(T) = 5*T

Let T be the time when it hit the water.

It will also take the sound of the splash 340*T to be heard. 340 m/s is the assumed speed of sound.

How far down is the water?

Let H be the depth of the water in the well.

sqrt(2H/g) + H/340 = 5

You will have to solve that graphically, by iteration or the quadratic formula

H = 108 meters

Time when it hit water:

T = sqrt(2H/g) = 4.69 s

V(4.69) = 46 m/s

**Answer this Question**

**Related Questions**

physics - Glenda drops a coin from ear level down a wishing well. The coin falls...

Physics - A coin is dropped from rest into a well with water 45.0m below the ...

physics - A coin is dropped from a height of 40 meters. How fast is the coin ...

college - A coin dealer, offered a rare silver coin, suspected that it might be ...

Math - Before a football game, a coin toss is used to determine which team will ...

MATH - 24 1c coins are set out in a row on a table. Then every 2nd coin is ...

MATHS - 24 1c coins are set out in a row on a table Then every 2nd coin is ...

physics HELP! - A 4.0 g coin sliding to the right at 26.0 cm/s makes an elastic ...

Physics - A 5.9 g coin sliding to the right at 27.6 cm/s makes an elastic head-...

chemistry - A coin dealer, offered a rare silver coin, suspected that it might ...