Posted by Ethan on Thursday, May 24, 2012 at 4:38pm.
An external force F is holding a bob of mass 725 g in a stationary position. The angle that the massless rope makes with the vertical is θ = 33°.
(a) What is the magnitude, F, of the force needed to maintain equilibrium in N?
(b) What is the tension in the rope in N?

Physics  Elena, Thursday, May 24, 2012 at 6:01pm
F =T•sinα ,
mg = T•cos α..
F/m•g = tan α,
F = m•g•tan α =0.725•9.8•0.65 =4.6 N,
T =F/sinα = 4.6/0.54 = 8.45 N.

Physics  Ethan, Thursday, May 24, 2012 at 8:28pm
I understand how the first and third equations are used to find the answers, but how is the second equation (mg = Tcosa) used?

Physics  Elena, Friday, May 25, 2012 at 1:06pm
The third equation is the result of division the first equation by the second equation
Answer This Question
Related Questions
 physics  small mass hangs at rest from a vertical rope of length that is fixed...
 Physics  A 20 kg sign is pulled by a horizontal force such that the single rope...
 PHYSICS(HELP)  A pendulum of mass m= 0.8 kg and length l=1 m is hanging from ...
 physics help  A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the...
 physics help  A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the...
 Physics Classical Mechanics Help ASAP  A pendulum of mass m= 0.8 kg and length ...
 Physics  A 1.00 g mass hangs by a string next to an identical stationary mass. ...
 physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!  A pendulum of mass m= 0.9 kg and length...
 physics Classical Mechanics  A pendulum of mass m= 0.9 kg and length l=1 m is ...
 Classical mechanics  A pendulum of mass m= 0.9 kg and length l=1 m is hanging ...
More Related Questions