examI - Problem 1. (32 points) Answer the following...

Info iconThis preview shows pages 1–3. 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: Problem 1. (32 points) Answer the following questions and give brief explanations for your answers . Just stating the answer without explanation is not sufficient. Note, there are also questions on the back of this page. Answer all the parts! (a) You have a tennis ball in your hand and throw it straight down from a height h so that it bounces off the floor and returns to your hand at a height h , 1 . 0 s later. What is the average velocity of the tennis ball for this motion? (b) An automobile has an initial velocity v 1 and brakes to a stop in time t 1 with a constant deceleration a 1 . If the initial velocity is instead twice as large, v 2 = 2 v 1 , and the deceleration is half as large, a 2 = a 1 / 2, what is the ratio of stopping times between these two cases, t 2 /t 1 ? (c) The speedometer of your automobile shows that you are proceeding at a steady speed of 80 km / h for some time interval. Can your automobile be accelerating during this time interval? F m (d) You hold your physics book at rest against a rough wall by exerting a force F on the book. Draw a complete free-body diagram for the book. [ Note : There is friction between the book and the wall. Ignore friction between your hand and the book.] Wednesday, 14 February 2007 1 PHYS 121 Exam I Problem 1 continued: 3 2 1 y x (e) [8 points] Identical projectiles are launched that follow the three trajectories...
View Full Document

This homework help was uploaded on 04/08/2008 for the course PHYS 121 taught by Professor Kernan during the Spring '08 term at Case Western.

Page1 / 6

examI - Problem 1. (32 points) Answer the following...

This preview shows document pages 1 - 3. Sign up to view the full document.

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