0

Guest

Courses New

Someone exerts a force F directly up on the axle of the pulley shown in Fig. Consider the pulley and string to be mass- less and the bearing frictionless. Two objects, m 1 of mass 1.2 kg and m 2 of mass 1.9 kg, are attached as shown to the opposite ends of the string, which passes over the pulley. The object m 2 is in contact with the floor. (a) What is the largest value the force may have so that m 2 will remain at rest on the floor? (b) What is the tension in the string if the upward force F is 110 N? (c) With the tension determined in part (b), what is the acceleration of m 1 ?

Someone exerts a force F directly up on the axle of the pulley shown in Fig. Consider the pulley and string to be mass- less and the bearing frictionless. Two objects, m1 of mass 1.2 kg and m2 of mass 1.9 kg, are attached as shown to the opposite ends of the string, which passes over the pulley. The object m2 is in contact with the floor. (a) What is the largest value the force  may have so that m2 will remain at rest on the floor? (b) What is the tension in the string if the upward force F is 110 N? (c) With the tension determined in part (b), what is the acceleration of m1?
 

Grade:11

2 Answers

Aditi Chauhan
askIITians Faculty 396 Points
8 years ago
236-1780_1.PNG
Round off to two significant figures,
F = 37 N
Therefore, the maximum force F for which block with mass m2 stays on floor is 37 N .
(b)
The tension in the string is related to upward force as:

236-289_1.PNG
Therefore, the tension in the string corresponding to upward force of 110 N is 55 N.

236-1391_1.PNG
Ashutosh Garg
25 Points
8 years ago
a. Taking the same situation mid air we get that m2 goes down with the accelaration of a = (m2-m1)g/(m2+m1).
     Now considering this case for the mass m2 to remain at the ground the pulley shold go up 2a.
     so F=(m1+m2)2a = 2(m2-m1)g. putting values we get the answer = 14N
 
 
pls aprove if it is helpful to you

Think You Can Provide A Better Answer ?

Other Related Questions on Mechanics

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More