{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

PHYS171_f11_exam_3_example

# PHYS171_f11_exam_3_example - PHYS171 Exam 3 practice Name...

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

PHYS171 Exam 3 practice Fall 2011 Name: _____________________ Student ID #: ________ 1 Short Answer Questions 1) You need to launch an object at sufficient velocity so that it entirely escapes the earth’s gravitation field (i.e., at escape velocity). To minimize the energy required it is better to (a) launch from the highest mountain accessible (b) launch from the deepest valley accessible (c) it doesn’t matter, why? (5 points) 2) You have a slingshot that launches an object at a fixed velocity. Standing on the roof of this building, you must use it to launch your iPhone so that it lands on the ground below, at which point you can assume it comes instantly to rest. To minimize the risk of damage, should you (a) launch it straight up (b) launch it straight down (c) launch it horizontally (d) it does not matter. Why? (5 points) 3) A baseball bat is 1 meter long, and weighs 0.75 kg. What is the effective moment of intertia when a baseball player swings the bat (10 points)? 4) One cylinder rolls down an inclined plane without slipping and a second identical cylinder slides down the same inclined plane without friction. Which cylinder’s center of mass is moving faster when it reaches the bottom of the inclined plane. (a) rolling of (b) sliding. (5 points)

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern