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Giancoli - Physics for S&E 4/e (Homework)

James Finch

Physics - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score : 1 / 20

Due : Tuesday, September 14, 2010 20:00 EDT

About this Assignment

Question
Points
1 2 3 4 5 6
1 0/6 0/3 0/6 0/2 0/2
Total
1/20 (5.0%)

Description

Here are some textbook questions from Physics for Scientists and Engineers 4/e by Giancoli published by Addison-Wesley. 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. 1/1 points All Submissions Notes Question: GianPSE4 1.P.040.
Question part
Points
Submissions
1
1
1/50
Total
1/1
 
Computer chips (see figure) are etched on circular silicon wafers of thickness 0.600 mm that are sliced from a solid cylindrical silicon crystal of length 20 cm. If each wafer can hold 100 chips, what is the maximum number of chips that can be produced from one entire cylinder?
Enter a number.
Your answer is correct. chips


2. –/6 points Notes Question: GianPSE4 2.P.016.
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
 
The position of a ball rolling in a straight line is given by x = 2.3 - 4.6t + 1.2 t2, where x is in meters and t in seconds.
(a) Determine the position of the ball at t = 1.0, 2.0, and 3.0 s.
t = 1.0
Enter a number.
 m
t = 2.0
Enter a number.
 m
t = 3.0
Enter a number.
 m

(b) What is the average velocity over the interval t = 1.0 s to t = 3.0 s?
Enter a number.
 m/s

(c) What is its instantaneous velocity at t = 2.0 s and at t = 3.0 s?
t = 2.0
Enter a number.
 m/s
t = 3.0
Enter a number.
 m/s


3. –/3 points Notes Question: GianPSE4 2.P.072.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
A person jumps from a fourth-story window h = 13.5 m above a firefighter's safety net. The survivor stretches the net d = 1.1 m before coming to rest, the figure.
(a) What was the average deceleration experienced by the survivor when slowed to rest by the net?
Enter a number.
 m/s2

(b) What would you do to make it "safer" (that is, generate a smaller deceleration): would you stiffen or loosen the net?
    


Explain.


4. –/6 points Notes Question: GianPSE4 3.P.017.
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
 
The position of a particular particle as a function of time is given by vector r = (8.50 t ihatbold + 8.70 jhatbold -2.25 t2 khatbold) m. Determine the particle's velocity and acceleration as a function of time.
velocity
Enter a number.
·ihatbold m/s +
Enter an exact number.
·jhatboldm/s +
Enter a number.
 t ·khatbold m/s
acceleration
Enter an exact number.
·ihatbold m/s +
Enter an exact number.
·jhatbold m/s +
Enter a number.
·khatbold m/s


5. –/2 points Notes Question: GianPSE4 4.P.032.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
A window washer pulls herself upward using the bucket-pulley apparatus shown in the figure. The mass of the person plus the bucket is 69 kg.
(a) How hard must she pull downward to raise herself slowly at constant speed?
Enter a number.
 N

(b) If she increases this force by 10 percent, what will her acceleration be?
Enter a number.
 m/s2 (upward)


6. –/2 points Notes Question: GianPSE4 7.P.057.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
A mass m is attached to a spring which is held stretched a distance xmax by a force Fmax (see figure), and then released. The spring contracts, pulling the mass. For the following answers, assume that there is no friction. Use m for the mass, x for the distance xmax and F for the force Fmax.
(a) Determine the speed of the mass when the spring returns to its normal length (x = 0).
Enter a mathematical expression.
Click here to preview your answer.

(b) Determine the speed of the mass when the spring returns to half its original extension (x = xmax/2).

Enter a mathematical expression.
Click here to preview your answer.

Click here for help with symbolic formatting.
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