Efficiently Solving a Simple Pulley Question with Mass and Force Calculations

[I_LuV_FiZiX]

Homework Statement

A window washer pulls herself upward using the bucket-pulley apparatus shown in figure below.

Homework Equations

With what force must she pull downward to raise herself slowly at constant speed? The mass of person plus bucket is 66.3 kg.

The Attempt at a Solution

f=ma
f=66.3 x 9.8
f=650N
wrong?

 

[tiny-tim]

Homework Statement

A window washer pulls herself upward using the bucket-pulley apparatus shown in figure below.

Homework Equations

With what force must she pull downward to raise herself slowly at constant speed? The mass of person plus bucket is 66.3 kg.

The Attempt at a Solution

f=ma
f=66.3 x 9.8
f=650N
wrong?

Hi I_LuV_FiZiX!

(You haven't told us what the pulley arrangement is. )

Hint: in these questions, always ask yourself what the tension in the rope is.

 

[I_LuV_FiZiX]

the pulley arrangement is two strings parallel to each other with a pulley at the top, she is in the bucket attached to the string on the left, and she is pulling down on the pulley on the right in order to bring her and the bucket up...thanks for considering my question

 

[tiny-tim]

the pulley arrangement is two strings parallel to each other with a pulley at the top, she is in the bucket attached to the string on the left, and she is pulling down on the pulley on the right in order to bring her and the bucket up

ok … then consider the forces on the bucket … what is the tension in the rope if there is no acceleration?