solution03_pdf - ortiz (lno236) Homework 2 Weathers (17101)...

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

View Full Document Right Arrow Icon
ortiz (lno236) – Homework 2 – Weathers – (17101) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points The velocity oF a particle moving along the x axis varies in time according to the expression v ( t ) = α - β t 2 where α = 59 . 4 m / s, β = 4 . 92 m / s 3 , and t is in seconds. ±ind the average acceleration in the time interval From t = 0 to 1 . 98 s. Correct answer: - 9 . 7416 m / s 2 . Explanation: Let : α = 59 . 4 m / s , β = 4 . 92 m / s 3 , and t f = 1 . 98 s . v i = α - β t 2 i = 59 . 4 m / s - (4 . 92 m / s 3 ) (0 s) 2 = 59 . 4 m / s , v f = α - β t 2 f = 59 . 4 m / s - (4 . 92 m / s 3 ) (1 . 98 s) 2 = 40 . 1116 m / s , so the average acceleration is ¯ a = v f - v i t f - t i = 40 . 1116 m / s - 59 . 4 m / s 1 . 98 s - 0 s = - 9 . 7416 m / s 2 . 002 (part 2 oF 2) 10.0 points Determine the acceleration oF the particle at t f = 1 . 98 s. Correct answer: - 19 . 4832 m / s 2 . Explanation: Let : t f = 1 . 98 s . Applying calculus, the acceleration is a ( t ) = d v dt = d dt ( α - β t 2 ) = - 2 β t = - 2 (4 . 92 m / s 3 ) (1 . 98 s) = - 19 . 4832 m / s 2 . 003 (part 1 oF 2) 10.0 points An electron in the cathode ray tube oF a tele- vision set enters a region where it acceler- ates uniFormly From a speed oF 55900 m / s to a speed oF 4 . 19 × 10 6 m / s in a distance oF 3 . 13 cm. What is its acceleration?
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/31/2010 for the course PHYSICS 1710 taught by Professor Weathers during the Fall '10 term at North Texas.

Page1 / 4

solution03_pdf - ortiz (lno236) Homework 2 Weathers (17101)...

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