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Zinke-Allmang - Physics for the Life Sciences 3/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 11 / 15

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
5/5 4/4 1/2 –/2 0/1 1/1
Total
11/15 (73.3%)

  • Instructions

    Physics for the Life Sciences, 3rd edition, by Martin Zinke-Allmang, Ken Sills, Reza Nejat, and Eduardo Galiano-Riveros, published by Nelson Education, brings the beauty of physics to life. Taking an algebra-based approach with the selective use of calculus, this text provides a concise approach to basic physics concepts using a fresh layout and many conceptual examples. The WebAssign component for this text includes instant feedback to randomized questions and links to an eBook.

    This sample assignment highlights several key WebAssign question features.
    • Question 1 includes conditional answer blanks, which require previous blanks to be filled in first.
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Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 5/5 points  |  Previous Answers ZinPhysLS3 1.P.018. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
1/1 1/1 1/1 1/1 1/1
4/100 2/100 2/100 2/100 2/100
Total
5/5
 
In this problem, use the exact values you enter in previous answer(s) to make later calculation(s).
We develop an empirical formula connecting the wingspan and the mass of some species able to fly. Then we evaluate a few interesting consequences. (The first to make these considerations was Leonardo da Vinci.)
(a)
Use the data in the table below to draw a double-logarithmic plot ln W versus ln M where W is the wingspan and M is the mass.
Bird Wingspan (cm) Mass (g)
Hummingbird 7 10
Sparrow 15 50
Dove 50 400
Andean condor 320 11,500
California condor 290 12,000

Correct: Your answer is correct.
Determine the constants a and b in a power law relation
W = a M b.
a= Correct: Your answer is correct. seenKey

1.94

 cm/g b= Correct: Your answer is correct. seenKey

0.539
(b)
The largest animal believed ever to fly was a late Cretaceous pterosaur species found in Texas and named Quetzalcoatlus northropi. It had an 11 m wingspan. What is the maximum mass (in kg) of this pterosaur? Note: The largest wingspan of a living species is 3.6 m, for the wandering albatross.
Correct: Your answer is correct. seenKey

128

 kg
(c)
Assume that a human wishes to fly like a bird. What minimum wingspan (in cm) would be needed for a person of 84 kg to take off?
Correct: Your answer is correct. seenKey

875

 cm
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2. 4/4 points  |  Previous Answers ZinPhysLS3 1.P.028. My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 1/1 1/1 1/1
2/100 2/100 1/100 2/100
Total
4/4
 
If the density of all mammals is approximately the same as the density of water, what is the ratio of the volume of a sheep to the volume of a red squirrel? (Use data from this table as necessary.)
Vsheep
Vred squirrel
 = Correct: Your answer is correct. seenKey

285
What is the ratio of the volume of a Holstein cow to the volume of a three-toed sloth?
VHolstein cow
Vthree-toed sloth
 = Correct: Your answer is correct. seenKey

184
Could two of every modern land mammal on this table be housed in an ark that is 300 cubits long, 50 cubits wide, and 30 cubits in height? (Assume 1 cubit is approximately 45 cm.)
     Correct: Your answer is correct.
Could two of every modern land mammal on this table be housed in the volume equivalent to that of a blue whale?
     Correct: Your answer is correct.
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3. 1/2 points  |  Previous Answers ZinPhysLS3 2.P.007. My Notes
Question Part
Points
Submissions Used
1 2
1/1 0/1
3/100 1/100
Total
1/2
 
The figure below shows a back view of an adult male and an adult female human (accompanied by two children). (Assume that to the right and up are the positive x- and y-directions.)
(a)
For a typical male, the vertical distance from the bottom of the feet to the neck is
d1 = 147 cm
 and the distance from the neck to the hand is
d2 = 76 cm.
 Find the vector (in cm) describing the position of the hand relative to the bottom of the feet if the angle at which the arm is held is
θ = 32°
 to the vertical.
(x,y) =
(40.3, 82.5)
Correct: Your answer is correct. webMathematica generated answer key cm
(b)
Repeat the calculation (in cm) for a typical female with
d1 = 131 cm, d2 = 61 cm,
 and the same angle θ.
(x,y) =
0
Incorrect: Your answer is incorrect. webMathematica generated answer key cm
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4. –/2 points ZinPhysLS3 4.P.033. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
In the figure below, assume
m1 = 10 kg
 and
m2 = 5.4 kg.
 The coefficient of static friction between the object on the table and the table surface is 0.8, and the coefficient of kinetic friction is 0.2. The system is set in motion with the object of mass m2 moving downward. What is the acceleration of the object of mass m1?
magnitude m/s2 direction
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5. 0/1 points  |  Previous Answers ZinPhysLS3 5.P.014. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
Two objects, each moving with the same speed but in opposite directions, collide head-on. After the collision, the smaller object of mass
m = 115 g
 is embedded in the larger object of mass
M = 920 g.
 Find an expression for the final speed in terms of the initial speed. (Use the following as necessary: vi for the initial speed)
vf =
cos−1(44)
Incorrect: Your answer is incorrect. $ans1d v_{\text{i}}
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6. 1/1 points  |  Previous Answers ZinPhysLS3 7.P.002. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
A standard man uses a bicycle of mass 31 kg to travel at constant speed along a 3 km long road up a hill. The hilltop is 225 m above the point of departure and the standard man needs ½ hour for the trip.

A second standard man chooses to climb the hill along the shortest route, a trail of 2 km length. If this standard man uses the same power, will he reach the hilltop before, after, or together with the standard man taking the longer route? (Assume this second standard man is also using a bicycle of mass 31 kg and both standard men depart at the same time.)
     Correct: Your answer is correct.
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