Lect17

# In which case is the tension in the wire biggest in a

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o the wall. In case 2 the plank is half the length but has the same mass as in case 1, and the wire makes the same angle with the plank. In which case is the tension in the wire biggest? In A) Case 1 B) Case 2 C) Both are the same gravity M L 42% got this right M L/2 Physics 211 Lecture 17, Slide 24 Act Which equation correctly expresses the fact that the total torque about the hinge is zero? torque L =0 2 L B) TL − Mg = 0 2 C) TL − MgL sin(θ ) = 0 C) The L cancels out: The T Ls in (θ ) A) TL sin(θ ) − Mg A) θ Mg L Mg T sin(θ ) = 2 Physics 211 Lecture 17, Slide 25 In which case is the tension in the wire biggest? In A) Case 1 B) Case 2 C) Same M M L L/2 A) the force is at a point that is twice the length away so the torque is twice as big B) they both have a net force and torque of zero case two has a shorter lever arm so it needs a bigger force to produce the same torque to cancel out their equal weights. C) The tension will be the same in both cases because T=Mg/2sin(theta), C) and theta and M are equal in both cases. Physics 211 Lecture 17, Slide 26...
View Full Document

## This note was uploaded on 03/18/2013 for the course CSCI 402 taught by Professor Tuceryan during the Fall '10 term at IUPUI.

Ask a homework question - tutors are online