#### Spring 2015 Homework Assignment Page 1 for PH111L (__Fundamentals of Physics I__)

Text: Serway & Jewett *Physics for Scientists and Engineers (8th edition)*

OQ are 'objective questions'. Be prepared to discuss them in class but no need to put answers on paper.

CQ are 'conceptual questions'. Put your responses on paper in coherent elegant prose, using a few full sentences.

P are 'problems'. The answers to the odd-numbered problems are in the back of the book. Put your solutions on paper.

**Assignment 1** (Assgd Tues 20 Jan; Due Tues 27 Jan)
CH 1 OQ #4 (do it in your head for maximum fun, and then write it out to see how the units conspire)
CH 1 P #2 [use units of kg/m^{3} and recall that water's density is 1000 kg/m^{3}], 10, 14
[you can find conversions on the web, or on the inside back cover of the text, or in appendix A], 23 [express your answer in mm]
CH 2 OQ #1, 5 [think carefully about this one], 7 [ditto]
CH 2 P #1, 4, 5, 6

**Assignment 2** (Assgd Tues 27 Jan; Due Tues 3 Feb)
CH 2 OQ # 9, 12, 16
CH 2 P # 10, 16 [work each 'leg' of the motion separately], 25, 32, 51, 61 [this one is pretty involved, and graphs of velocity and
of position (both cars on the same graph) will assist in clarifying what is going on]

Here are the solutions to homeworks 1 and 2

**Assignment 3** (Assgd Thurs 5 Feb; Due Thurs 12 Feb)
CH 3 OQ # 5, 7, 9, 13
CH 3 P # 10 [yes folks, forces are vectors.. and when two act on a body, the effect is the resultant force, which is the vector sum of the two],
16, 39 [hint: work in components]
CH 4 OQ # 2, 14
CH 4 P # 5, [see note below heading for Section 4.3 problems but take g = 10 for simplicity] 12, 17, 18

Here are the solutions to homework 3

**Assignment 4** (Assgd Thurs 12 Feb; Due Tues 17 Feb)
CH 4 OQ # 7, 8
CH 4 P # 27, 29 [note that it is the *period* that you are to calculate.. but you might find the speed too, just for fun],
32, 34

Here are the solutions to homework 4

**Assignment 5** (Assgd Thurs 19 Feb; Due Tues 24 Feb)
CH 5 OQ # 2, 13
CH 5 P # 3 [find the average acceleration as a vector, and it is the same as the constant instantaneous acceleration of course],
4, 10 [you will need to invent some names for the forces and I suggest the 'double subscript' form **F**_{ij}, where *i*
represents the body *exerting* the force and *j* represents the body *feeling* the force], 13 [note that the forces are drawn 'tail-to-tail'
so you might want to redraw as 'tip-to-tail' so as to use the triangle method to add them in a sketch], 16 [to answer the question 'what is the direction of
the acceleration, you may phrase **a** using unit vectors and that'll do the job well], 20, 23 [same thing as the orthodonture problem], 31

Here are the solutions to homework 5

**Assignment 6** (Assgd Thurs 26 Feb; Due Thurs 5 Mar)
CH 6 OQ # 4 [pretty complicated acceleration patterns!], 7,
CH 6 P # 2, 8, 9, 16, 17, 26, 29, 35 [for the theorists! you might need to become more familiar with the wonderful properties of the negative
exponential function..]

Here are the solutions to homework 6