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Halliday, Resnick & Walker - Fund. of Physics 10/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 8 / 18

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7
2/4 1/1 0/2 3/4 0/3 –/2 2/2
Total
8/18 (44.4%)

  • Instructions

    Fundamentals of Physics 10/e by David Halliday, Robert Resnick and Jearl Walker published by John Wiley & Sons, Inc. is now a WebAssign Plus selection. WebAssignPLUS includes a complete on-line version of the text, the Student Study Guide, the Student Solution Manual, and a variety of interactive study aids. All of these rich resources are linked together in a dynamic and interactive environment for students. Additional links to the eBook within each problem are structured to support the way students work and provide them with superior just-in-time learning resources. Also the eBook availability provides students with a significantly less expensive option than the printed version.

    Questions 1, 3, 4 are traditional end of chapter problems.

    Question 5 and 6 are simulation problems that use an interactive simulation in which students can manipulate initial conditions and observe their calculations in action.

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    Question 7 is a question requiring answers using algebraic expressions.

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1. 2/4 points  |  Previous Answers HRW10 4.P.006. My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 0/1 1/1 0/1
1/50 7/50 1/50 3/50
Total
2/4
 
An electron's position is given by r = 1.00t i - 3.00t2 j + 2.00 k, with t in seconds and r in meters.
(a) In unit-vector notation, what is the electron's velocity v(t)? (Use the following as necessary: t.)
v(t) =
1.00i−6tj+0k
Correct: Your answer is correct. m/s

(b) What is v in unit-vector notation at t = 9.00 s?
v(9.00) =
1.00j−54d+0t
Incorrect: Your answer is incorrect. m/s


(c) What is the magnitude of v at t = 9.00 s?
Correct: Your answer is correct. m/s

(d) What angle does v make with the positive direction of the x axis at t = 9.00 s?
Incorrect: Your answer is incorrect. ° (from the +x axis)
The given vector r is a function of time t. Velocity is the time derivative of vector r. The derivative is taken component by component, and the unit-vector symbols must be retained. The magnitude of a vector is calculated with the Pythagorean Theorem, and the angle is calculated with an inverse tangent.

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2. 1/1 points  |  Previous Answers HRW10 4.P.050.GO. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
At time t = 0, a projectile is launched from ground level. At t = 2.5 s, it is displaced d = 27.8 m horizontally and h = 49.4 m vertically above the launch point. At the instant it reaches its maximum height above ground level, what is its horizontal displacement D from the launch point?
Correct: Your answer is correct. m

GO Tutorial

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3. 0/2 points  |  Previous Answers HRW10 4.P.027. My Notes
Question Part
Points
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1 2
0/1 0/1
6/50 3/50
Total
0/2
 
A certain airplane has a speed of 295.0 km/h and is diving at an angle of 30.0° below the horizontal when the pilot releases a radar decoy (see figure below). The horizontal distance between the release point and the point where the decoy strikes the ground is 700 m. (Neglect air resistance.)
(a) How high was the plane when the decoy was released?
Incorrect: Your answer is incorrect. m

(b) How long was the decoy in the air?
Incorrect: Your answer is incorrect. s

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4. 3/4 points  |  Previous Answers HRW10 4.P.036. My Notes
Question Part
Points
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1 2 3 4
1/1 1/1 1/1 0/1
1/50 1/50 2/50 1/50
Total
3/4
 
During a tennis match, a player serves the ball at 24.8 m/s, with the center of the ball leaving the racquet horizontally 2.43 m above the court surface. The net is 12 m away and 0.90 m high.
(a) When the ball reaches the net, does the ball clear it?
     Correct: Your answer is correct.

(b) What is the distance between the center of the ball and the top of the net?
Correct: Your answer is correct. m
Suppose that, instead, the ball is served as before but now it leaves the racquet at 4.50° below the horizontal.
(c) When the ball reaches the net, does the ball clear it?
     Correct: Your answer is correct.

(d) What now is the distance between the center of the ball and the top of the net?
Incorrect: Your answer is incorrect. m
First decide: What are the magnitude and angle of the launch? To calculate the height for a given horizontal distance, you can use the function y(x) given in the chapter. Or you can solve two equations simultaneously by eliminating time t : y(t) (that is, y as a function of t) and x(t).

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5. 0/3 points  |  Previous Answers HRW10 4.SIM.002. My Notes
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1 2 3
0/1 0/1 –/1
1/50 1/50 0/50
Total
0/3
 
Note: Use principles of physics to solve the problem and then verify your answer using the simulation.

If the range of the projectile is 4.24 m, the time-of-flight is T = 0.833 s, and air resistance is negligible, determine the following. (Assume that the acceleration due to gravity has a magnitude of g = 9.80 m/s2.)
(a) What is the launch angle of the projectile?
Incorrect: Your answer is incorrect. °

(b) What is the initial speed of the projectile?
Incorrect: Your answer is incorrect. m/s

(c) Express the maximum height reached by a projectile like the one in this problem but with any range and time of flight in terms of g and T (the time-of-flight).
ymax =

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6. –/2 points HRW10 4.SIM.003. My Notes
Question Part
Points
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1 2
–/1 –/1
0/50 0/50
Total
–/2
 
Note: Use principles of physics to solve the problem and then verify your answer using the simulation. Consider these four situations:
Case A: The boat speed is 4 m/s; the boat direction is 0 degrees; the river speed is 2 m/s.
Case B: The boat speed is 4 m/s; the boat direction is +30 degrees; the river speed is 2 m/s.
Case C: The boat speed is 4 m/s; the boat direction is -30 degrees; the river speed is 2 m/s.
Case D: The boat speed is 4 m/s; the boat direction is +15 degrees; the river speed is 2 m/s.
(a) Rank these cases by the time it takes to cross the river, from largest to smallest. Use only > and/or = signs in your ranking (e.g., B>A>C=D).


(b) Rank these cases by the distance traveled in crossing the river, from largest to smallest.

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7. 2/2 points  |  Previous Answers HRW10 4.SQ.022. My Notes
Question Part
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1 2
1/1 1/1
1/50 1/50
Total
2/2
 
A small ball rolls horizontally off the edge of a tabletop of height h. It strikes the floor a distance x horizontally away from the edge of the table. (Use any variable or symbol stated above along with the following as necessary: g.)
(a) How long is the ball in the air?
t =
√2hg​
Correct: Your answer is correct.

(b) What is its speed at the instant it leaves the table?
v =
x√2hg​​
Correct: Your answer is correct.

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