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Serway and Jewett - Principles of Physics 3/e (Homework)

James Finch

Physics - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/18

Due: Monday, December 13, 2010 21:00 EST

About this Assignment

Question
Points
1 2 3 4 5
0/4 0/6 0/3 0/2 0/3
Total
0/18

Description

Here are some textbook questions from Principles of Physics 3/e by Serway and Jewett published by Harcourt College Publishers. Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/4 points Notes Question: SJ3 1.P.043.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
Three vectors of a croquet ball are oriented as shown in Figure P1.43, where |A| = 22.0, |B| = 38.0 and |C| = 25.0 units.


Figure P1.43

(a) Find the x and y components of the resultant vector.
x =
Enter a number.
y =
Enter a number.
(b) Find the magnitude and direction of the resultant vector.
Enter a number.
 units
Enter a number.
° (counterclockwise from the +x axis)


2. –/6 points Notes Question: SJ3 2.P.013.
Question part
Points
Submissions
1 2 3 4 5 6
0/1 0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50 0/50
Total
0/6
 
Figure P2.13 shows a graph of v versus t for the motion of a motorcyclist as he starts from rest and moves along the road in a straight line.


Figure P2.13

(a) Find the average acceleration for the time interval t0 = 0 to t1 = 2.0 s.
Enter a number.
 m/s2
(b) Estimate the time at which the acceleration has its greatest positive value.
Enter a number.
 s
What is the value of the acceleration at that instant?
Enter a number.
 m/s2
(c) When is the acceleration zero?
Enter a number.
 s
(d) Estimate the maximum negative value of the acceleration.
Enter a number.
 m/s2
At what time does it occur?
Enter a number.
 s


3. –/3 points Notes Question: SJ3 3.P.031.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
Figure P3.31 represents the total acceleration of a particle moving clockwise in a circle of radius 4.50 m at a certain time.(a = 10.0 m/s2)


Figure P3.31

(a) At this instant, find the radial acceleration.
Enter a number.
 m/s2 (toward the center)

(b) At this instant, find the speed of the particle.

Enter a number.
m/s

(c) At this instant, find its tangential acceleration.

Enter a number.
m/s2 (in the direction of the motion)


4. –/2 points Notes Question: SJ3 4.P.026.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
A mass m1 = 8.00 kg, placed on a frictionless, horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging mass m2 = 14.0 kg, as in Figure P4.26. Draw free-body diagrams of both masses. (Do this on paper. Your instructor may ask you to turn in these diagrams.)
Find the acceleration of the two objects toward the pulley and downward, respectively.
Enter a number.
 m/s2
What is the tension in the string?
Enter a number.
 N


Figure P4.26



5. –/3 points Notes Question: SJ3 5.P.016.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
Consider a conical pendulum with an 82.5 kg bob on a 10.3 m wire making an angle of 4.60° with the vertical (Fig. P5.16).


Figure P5.16.


(a) Determine the horizontal and vertical components of the force exerted by the wire on the pendulum.
Enter a number.
 N i +
Enter a number.
 N j
(b) Determine the centripetal acceleration of the bob.
Enter a number.
 m/s2

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