P150_Exam2_F06 - Physics 151 November 6, 2006 Exam #2 Name_...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 151 Name______________________________ November 6, 2006 Exam #2 Lab Section Number________________ Instructions: There are 20 multiple choice questions (worth 2 points each), and 3 work problems (worth a total of 60 points). You must answer all questions to receive full credit. You must show all equations and substitutions made to obtain your answers for the work problems. Write the final answers to the problems with their respective units in the spaces provided. Part I (40) Part II (60) Total (100)
Background image of page 1

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

View Full DocumentRight Arrow Icon
Part I: Short Answers Multiple Choice: Please write in the letter of the item that best answers the question. 1.______ A car of mass m travels a distance d up a hill, ending a vertical distance h above the starting point. The work done by the gravitational force of the Earth on the car during the trip is (A) mgd. (B) -mgd (C) mgh . (D) -mgh . (E) mg(d+h). 2.______ For which of the following situations is negative work done on a block? (A) the block is whirled by means of a string around a circle at constant speed. (B) the block slides a distance d up an incline with decreasing speed. (C) the block slides a distance d down an incline with increasing speed. (D) the block slides a distance d down an incline at constant speed. (E) the block is carried from rest to the top of a hill, where it is again at rest. 3.______ A block of mass m starts from rest and slides a distance d down a frictionless incline that makes an angle θ with the horizontal. At the end of the slide the kinetic energy of the block is (A) mgd sin θ . (B) mgd cos θ . (C) mgd tan θ . (D) mgd/sin θ . (E) mgd/cos θ . 4.______ A crate slides across a level floor. The frictional force of the floor on the crate (A) increases both the kinetic and thermal energies of the crate. (B) increases the kinetic energy of the crate and decreases its thermal energy. (C) decreases the kinetic energy of the crate and increases its thermal energy. (D) decreases both the kinetic and thermal energies of the crate. (E) does not change the thermal energy of the crate. 5.______ The center of mass of any object is (A) inside the object. (B)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

P150_Exam2_F06 - Physics 151 November 6, 2006 Exam #2 Name_...

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