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Giancoli-Physics: Principles with Applications 6/e (Homework)

James Finch

Physics - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 9/15

Due: Sunday, September 19, 2010 20:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
3 4 2/3 0/3 0/2
Total
9/15

Description

Here are some textbook questions from Physics: Principles with Applications 6/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. 3/3 points All Submissions Notes Question: Giancoli6 2.P.032.
Question part
Points
Submissions
1 2 3
1 1 1
10/50 5/50 1/50
Total
3/3
 
A person driving her car at 48 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection (Fig. 2-29). The intersection is 15 m wide. Her car's maximum deceleration is -5.6 m/s2, whereas it can accelerate from 48 km/h to 70 km/h in 6.6 s. Ignore the length of her car and her reaction time.

Figure 2-29
If she hits the brakes, how far will she travel before stopping?
Enter a number.
Your answer is correct. m
If she hits the gas instead, how far will she travel before the light turns red?
Enter a number.
Your answer is correct. m
Should she try to stop, or should she speed up to cross the intersection before the light turns red?
    

Your answer is correct.



2. 4/4 points All Submissions Notes Question: Giancoli6 5.P.082.
Question part
Points
Submissions
1 2 3 4 5
0 1 1 1 1
2/50 2/50 2/50 2/50 2/50
Total
4/4
 
A car maintains a constant speed as it traverses the hill and valley shown in Figure 5-45. Both the hill and valley have a radius of curvature R.

Figure 5-45
(a) How do the normal forces acting on the car at A, B, and C compare? (Which is largest? Smallest? Compare using only the symbols > or = and denote the forces as Fa, Fb, and Fc. For example, Fa>Fb=Fc.)
Answer is not case sensitive.
Your answer is correct.
Explain.

(b) Where would the driver feel heaviest? Lightest? (Rank these locations using only the symbols > or = and denote the locations as A, B, and C. For example, A>B=C.)
Answer is not case sensitive.
Your answer is correct.
Explain.

(c) How fast can the car go without losing contact with the road at A? (Use only g for gravity and R.)
vmax =
Enter a mathematical expression.
Click here to preview your answer.Your answer is correct.
Click here for help with symbolic formatting.


3. 2/3 points All Submissions Notes Question: Giancoli6 6.P.030.
Question part
Points
Submissions
1 2 3
1 0/1 1
1/50 7/50 3/50
Total
2/3
 
In starting an exercise, a 1.6 m tall person lifts a 1.10 kg book on the ground so it is 1.70 m above the ground.
(a) What is the potential energy of the book relative to the ground?
Enter a number.
Your answer is correct. J
(b) What is the potential energy of the book relative to the top of the person's head?
Enter a number.
Your answer is incorrect. J
(c) How is the work done by the person related to the answers in parts (a) and (b)? (Select all that apply.)

Your answer is correct.




4. –/3 points Notes Question: Giancoli6 16.P.070.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
Two small, identical conducting spheres A and B are a distance R apart; each carries the same charge Q.
(a) What is the force sphere B exerts on sphere A? (Use k, Q, and R as appropriate.)
Enter a mathematical expression.
Click here to preview your answer.

(b) An identical sphere with zero charge, sphere C, makes contact with sphere B and is then moved very far away. What is the net force now acting on sphere A?
Enter a mathematical expression.
Click here to preview your answer.

(c) Sphere C next makes contact with sphere A and is then moved far away. What is the force on sphere A in this third case?
Enter a mathematical expression.
Click here to preview your answer.

Click here for help with symbolic formatting.

5. –/2 points Notes Question: Giancoli6 17.P.004.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
An electron acquires 4.00 multiplied by 10-16 J of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates, and which plate is at the higher potential?
Enter a number.
 V
    


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