HW3 - schneiter (tcs639) HW03 Ross (89152) 1 This print-out...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: schneiter (tcs639) HW03 Ross (89152) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A motorist is traveling at 14 m / s when he sees a deer in the road 47 m ahead. If the maximum negative acceleration of the vehicle is- 7 m / s 2 , what is the maximum reaction time t of the motorist that will allow him to avoid hitting the deer? Correct answer: 2 . 35714 s. Explanation: Let : v = 14 m / s , v = 0 , and a =- 7 m / s 2 . Basic Concept: v = x t v 2 = v 2 + 2 a x . Solution: v 2 = v 2 + 2 ax stop x stop =- v 2 2 a = 14 m . x- x stop = v t. This yields t = x- x stop v = 2 . 35714 s . 002 (part 2 of 2) 10.0 points If his reaction time is 2 . 54604 s, how fast will he be traveling when he reaches the deer? Correct answer: 6 . 08475 m / s. Explanation: Let: t = 2 . 54604 s Solution: x slow = x- v t . We again use the relation v 2 = v 2 + 2 a x slow , which gives v = radicalBig v 2 + 2 a ( x- v t ) = 6 . 08475 m / s . 003 (part 1 of 2) 10.0 points A speeder passes a parked police car at a constant speed of 28 . 6 m / s. At that instant, the police car starts from rest with a uniform acceleration of 2 . 62 m / s 2 ....
View Full Document

Page1 / 3

HW3 - schneiter (tcs639) HW03 Ross (89152) 1 This print-out...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online