Page1 / 1

323_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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

View Full Document Right Arrow Icon
323_Dynamics 11ed Manual

323_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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

View Full Document Right Arrow Icon
Engineering Mechanics - Dynamics Chapter 15 Problem 15-31 The log has mass M and rests on the ground for which the coefficients of static and kinetic friction are μ s and k respectively. The winch delivers a horizontal towing force T to its cable at A which varies as shown in the graph. Determine the speed of the log when t = t 2 . Originally the tension in the cable is zero. Hint: First determine the force needed to begin moving the log. Given: M 500 kg = t 1 3s = s 0.5 = T 1 1800 N = k 0.4 = g 9.81 m s 2 = t 2 5s = Solution: To begin motion we need 2 T 1 t 0 2 t 1 2 s Mg = t 0 s 2 T 1 t 1 = t 0 2.48 s = Impulse - Momentum 0 t 0 t 1 t 2 T 1 t t 1 2 d + 2 T 1 t 2 t 1 () + k Mg t 2 t 0 Mv 2 = v 2 1 M t 0 t 1 t 2 T 1 t t 1 2 d2 T 1 t 2 t 1 + k 2 t 0 = v 2 7.65
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online