Go Back   Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Oct 11th 2009, 06:12 PM   #1
Senior Member
 
Join Date: Sep 2009
Location: St. John's, NL
Posts: 124
tension problem

A steel ball of mass 3.70 kg is suspended from two strings as shown in the picture. The upper string is at an angle of theta = 35.0 from the vertical, while the lower string is horizontal. Calculate the magnitude of T2, the tension in the lower string.



how do i do this question? can anyone help? thanks
christina is offline   Reply With Quote
Old Oct 12th 2009, 02:07 AM   #2
Physics Team
 
Join Date: Feb 2009
Posts: 1,425
You must post your attempt.

Resolve T1 into its vertical and horizontal components. Since the ball is stationary, the net force in the vertical , as well as the horz direction is zero. Find T2.

Last edited by physicsquest; Oct 30th 2009 at 10:26 PM. Reason: Wrong tension mentioned.
physicsquest is offline   Reply With Quote
Old Oct 12th 2009, 02:51 PM   #3
Senior Member
 
Join Date: Sep 2009
Location: St. John's, NL
Posts: 124
Fn should be 3.7*9.8 = 36.26N

T1 = 36.26sin35

and.. how do i get the T2?
christina is offline   Reply With Quote
Old Oct 13th 2009, 06:09 AM   #4
Senior Member
 
Join Date: Sep 2009
Location: St. John's, NL
Posts: 124
hmm anyone..?
christina is offline   Reply With Quote
Old Oct 13th 2009, 11:11 AM   #5
Banned
 
Join Date: Aug 2009
Location: UK
Posts: 240
You know the weight is 3.7 x 9.8 = 36.26N vertical component steel ball.

First find t1 = 36.26/cos(35) = 44.265N

The steel ball is in equilibrium, so the sum of the forces on it is zero.

draw a vector diagram and use it to find t2, this will be the sq-rt of (t1^2 - vertical component (36.26^2)).Alternatively use t1 x sin(35)


t2=
Spoiler:
25.389N

Last edited by Paul46; Oct 13th 2009 at 01:58 PM.
Paul46 is offline   Reply With Quote
Old Oct 13th 2009, 01:24 PM   #6
Banned
 
Join Date: Aug 2009
Location: UK
Posts: 240
Also thinking about it, a very simple way to find t2:

vertical component (36.26N) x tan(35)

but i don't think your teacher would approve of this way

Last edited by Paul46; Oct 13th 2009 at 01:44 PM.
Paul46 is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Tags
problem, tension



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Help : Tension problem deci12 Energy and Work 6 Jan 29th 2014 05:52 AM
Tension Problem MozAngwles Kinematics and Dynamics 0 Sep 18th 2010 04:11 PM
tension problem.. christina Kinematics and Dynamics 14 Nov 1st 2009 12:38 PM
Tension problem Jg596 Kinematics and Dynamics 1 Mar 18th 2009 08:45 AM
Tension Problem PeachBlossoms Kinematics and Dynamics 1 Sep 22nd 2008 04:22 PM


Facebook Twitter Google+ RSS Feed