02-06ChapGere.0013

# 02-06ChapGere.0013 - S TRAIN ENERGY WHEN SPRING IS FULLY...

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

Problem 2.8-11 A bumper for a mine car is constructed with a spring of stiffness k 5 1120 lb/in. (see figure). If a car weighing 3450 lb is traveling at velocity v 5 7 mph when it strikes the spring, what is the maximum shortening of the spring? Solution 2.8-11 Bumper for a mine car 156 CHAPTER 2 Axially Loaded Members v k v k k 5 1120lb/in. W 5 3450lb v 5 7mph 5 123.2in./sec g 5 32.2ft/sec 2 5 386.4in./sec 2 Find the shortening d max of the spring. K INETIC ENERGY JUST BEFORE IMPACT
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: S TRAIN ENERGY WHEN SPRING IS FULLY COMPRESSED U 5 k d max 2 2 KE 5 Mv 2 2 5 Wv 2 2 g Conservation of energy S UBSTITUTE NUMERICAL VALUES : 5 11.0 in. d max 5 B (3450 lb)(123.2 in. / sec) 2 (386.4 in. / sec 2 )(1120 lb / in.) Solve for d max : Ê d max 5 B Wv 2 gk KE 5 U Ê Wv 2 2 g 5 k d max 2 2 A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online