Wednesday

August 20, 2014

August 20, 2014

Posted by **Zalak** on Tuesday, November 20, 2012 at 10:42pm.

a.What is the height of the cliff in meters?

b.If in part (a) you get two solutions of a quadratic equation and you use one for your answer, what does the other represent?

- Physics -
**drwls**, Wednesday, November 21, 2012 at 12:16amLet H be the height of the cliff. The the time required to fall a distance d is

t = sqrt(2d/g)

From the information given you can write:

sqrt(2H/g) - sqrt[(2/3)*2H/g] = 1.3

sqrt(2H/g)*[1 - sqrt(2/3)] = 1.3

0.1835*sqrt(2H/g)= 1.3

sqrt(2H/g) = 7.08

H = 246 m

Check: 2/3 of the way down is 164 m

Time to fall 164 m = 5.785 s

Time to fall 246 m = 7.085 s

Difference = 1.30 s

I did not have to solve a quadratic equation.

**Related Questions**

physics - A large boulder sits at the top edge of a cliff, this is boulder A. A ...

physics - 7. A 2000.0 kg boulder sits on the top of a 50.0 m cliff. As the ...

college physics - If a coyote is standing at the top of a 125 m cliff getting ...

Science (Physics) - 1.A hiker started to walk from her campsite heading east ...

physics - A 55 kg hiker starts at an elevation of 1600 m and climbs to the top ...

PHYSICS - A troll on a 75m tall cliff throws a 35 m/s boulder at 35 degrees ...

Physics - A hiker throws a rock with a mass of 1.4kg from a cliff that is 37 m ...

Physics: Vectors - A hiker walks 10.0 km[NE], 5.0 km[W], and then 2.0 km[S] in 2...

PHSYICS - A HIKER SHOUTS TOWARD A VERTICAL CLIFF 685 M AWAY. THE ECHO IS HEARD 4...

Intro to Physics - A boulder has 300 J of potential energy sitting on the edge ...