Friday

September 19, 2014

September 19, 2014

Posted by **skullhong** on Thursday, March 22, 2012 at 8:23am.

- mathematic -
**Reiny**, Thursday, March 22, 2012 at 10:02amlet the angle you mentioned be Ų

Let the foot of the ladder be x ft from the wall, and the height of the ladder be y ft

cosŲ = y/10

y = 10cosŲ

dy/dt = -10sinŲ dŲ/dt

when x = 6

x^2+y^2=100

y = 8 , and sinŲ = 8/10

Also we know dy/dt = -3 m/s

-3 = -10(8/10)(dŲ/dt)

dŲ/dt = 3/8 radians/s

**Answer this Question**

**Related Questions**

Math - Suppose there is a 10 meter ladder leaning against the wall of a building...

Calculus - 1a. 15 ft ladder is placed against a vertical wall. the bottom of the...

Calc. - A ladder 25ft long is leaning against the wall of a house. The ladder is...

Calculus - A 17 foot ladder is leaning against a wall. The bottom of the ladder...

math - A ladder 10 m long rests on horizontal ground and leans against a ...

Calculus - A 15 ft ladder is placed against a vertical wall. the bottom of the ...

CALCULUS - A 25 ft ladder is leaning against a vertical wall. At what rate (with...

Calculus - The top of a 24 foot ladder, leaning against a vertical wall, is ...

maths - a 4m ladder is leaning against a wall when its base starts to slide ...

Calculus - a 16 foot ladder is leaning against a building. the bottom of the ...