Register to reply

Pulley, Mechanics question

by AlchemistK
Tags: mechanics, newton's laws, pulley
Share this thread:
AlchemistK
#1
Jul7-11, 06:15 AM
P: 158
1. The problem statement, all variables and given/known data

Find the reading of the spring balance shown in the figure (see attachment). The elevator is going up with an acceleration of g/10 , the pulley and the string are light weight and the pulley is smooth.


2. Relevant equations
F= ma


3. The attempt at a solution
Since the elevator is accelerating upwards with a magnitude of 0.98 m/s^2 (g/10) , the acceleration acting on the items in the elevator should be g+g/10 = 10.78 m/s^2.
By assuming that the 3k load has a relative acceleration of "a", the tension on the string of the 1.5 kg load will be
16.7 - 3a
While on the 3kg load it will be
32.34 + 3a

I'm sure i have made a blunder somewhere up here, yet i cant seem to find it. How do i further solve the question?
Phys.Org News Partner Science news on Phys.org
'Smart material' chin strap harvests energy from chewing
King Richard III died painfully on battlefield
Capturing ancient Maya sites from both a rat's and a 'bat's eye view'
Apophilius
#2
Jul7-11, 08:51 AM
P: 14
Maybe it's just me, but I can't locate the attached image


Register to reply

Related Discussions
Pulley, Strings, Friction [Please..]{Mechanics} Introductory Physics Homework 14
Rotational Mechanics (Pulley and Mass) Introductory Physics Homework 2
Lagrangian Mechanics - Pulley System Advanced Physics Homework 1
Problem in mechanics involving a pulley Introductory Physics Homework 6