Physics Help Forum tension problem

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Oct 11th 2009, 07:12 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
 Oct 12th 2009, 03:07 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 11:26 PM. Reason: Wrong tension mentioned.
 Oct 12th 2009, 03:51 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?
 Oct 13th 2009, 07:09 AM #4 Senior Member   Join Date: Sep 2009 Location: St. John's, NL Posts: 124 hmm anyone..?
 Oct 13th 2009, 12:11 PM #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 02:58 PM.
 Oct 13th 2009, 02:24 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 02:44 PM.

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