{"id":11756,"date":"2021-10-27T16:55:32","date_gmt":"2021-10-27T16:55:32","guid":{"rendered":"https:\/\/assignmenttutors.net\/blog\/phys-216-assignment-3-latest-july2015\/"},"modified":"2021-10-27T16:55:32","modified_gmt":"2021-10-27T16:55:32","slug":"phys-216-assignment-3-latest-july2015","status":"publish","type":"post","link":"https:\/\/assignmenttutors.net\/blog\/phys-216-assignment-3-latest-july2015\/","title":{"rendered":"Phys 216 assignment 3 latest july2015"},"content":{"rendered":"
\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 1\/12<\/p>\n

Assignment 3<\/p>\n

Due: 11:59pm on Sunday, July 26, 2015<\/p>\n

You will receive no credit for items you complete after the assignment is due. Grading Policy<\/p>\n

Tactics Box 4.1 Drawing Force Vectors<\/p>\n

Learning Goal:<\/p>\n

To practice Tactics Box 4.1 Drawing force vectors.<\/p>\n

To visualize how forces are exerted on objects we can use simple diagrams, such as vectors. This Tactics Box<\/p>\n

illustrates the process of drawing a force vector by using the particle model, in which objects are treated as points.<\/p>\n

TACTICS BOX 4.1 Drawing force vectors<\/p>\n

1. Represent the object as a particle.<\/p>\n

2. Place the tail of the force vector on the particle.<\/p>\n

3. Draw the force vector as an arrow pointing in the direction that the force acts, and with a length<\/p>\n

proportional to the size of the force.<\/p>\n

4. Give the vector an appropriate label.<\/p>\n

The resulting diagram for a force exerted on an object is shown in the drawing. Note that the object is represented as<\/p>\n

a point.<\/p>\n

Part A<\/p>\n

A book lies on a table. A pushing force parallel to the table top and directed to the right is exerted on the book.<\/p>\n

Use the diagram below to draw the force vector . Use the black dot as the particle representing the book and be<\/p>\n

certain to draw the force vector so that it has the correct orientation.<\/p>\n

Draw the vector starting from the black dot. The location and orientation of the vector will be graded. The<\/p>\n

length of the vector will not be graded.<\/p>\n

ANSWER:<\/p>\n

F \u20d7<\/p>\n

F \u20d7<\/p>\n

p<\/p>\n

F \u20d7<\/p>\n

p<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 2\/12<\/p>\n

Part B<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

Part C<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

Problem 4.7<\/p>\n

A mountain climber is hanging from a rope in the middle of a crevasse. The rope is vertical.<\/p>\n

Part A<\/p>\n

Identify the forces on the mountain climber.<\/p>\n

Check all that apply.<\/p>\n

ANSWER:<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 3\/12<\/p>\n

Problem 4.16<\/p>\n

A constant force is applied to an object, causing the object to accelerate at 10 .<\/p>\n

Part A<\/p>\n

What will the acceleration be if the force is halved?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Part B<\/p>\n

What will the acceleration be if the object’s mass is halved?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Part C<\/p>\n

What will the acceleration be if the force and the object’s mass are both halved?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Part D<\/p>\n

What will the acceleration be if the force is halved and the object’s mass is doubled?<\/p>\n

Express your answer using two significant figures.<\/p>\n

Kinetic friction<\/p>\n

Weight<\/p>\n

Static friction<\/p>\n

Normal force<\/p>\n

Tension<\/p>\n

f<\/p>\n

\u20d7<\/p>\n

k<\/p>\n

w\u20d7<\/p>\n

f<\/p>\n

\u20d7<\/p>\n

s<\/p>\n

n\u20d7<\/p>\n

T<\/p>\n

\u20d7<\/p>\n

m\/s<\/p>\n

2<\/p>\n

a = m\/s<\/p>\n

2<\/p>\n

a = m\/s<\/p>\n

2<\/p>\n

a = m\/s<\/p>\n

2<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 4\/12<\/p>\n

ANSWER:<\/p>\n

Problem 4.22<\/p>\n

Two children fight over a 200 stuffed bear. The 25 boy pulls to the right with a 15 force and the 20 girl pulls<\/p>\n

to the left with a 17 force. Ignore all other forces on the bear (such as its weight).<\/p>\n

Part A<\/p>\n

At this instant, can you say what the velocity of the bear is?<\/p>\n

Enter yes or no.<\/p>\n

ANSWER:<\/p>\n

Part B<\/p>\n

At this instant, can you say what the acceleration of the bear is?<\/p>\n

Enter yes or no.<\/p>\n

ANSWER:<\/p>\n

Part C<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

Part D<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

A Book on a Table<\/p>\n

A book weighing 5 N rests on top of a table.<\/p>\n

a = m\/s<\/p>\n

2<\/p>\n

g kg N kg<\/p>\n

N<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 5\/12<\/p>\n

Part A<\/p>\n

A downward force of magnitude 5 N is exerted on the book by the force of<\/p>\n

ANSWER:<\/p>\n

Part B<\/p>\n

An upward force of magnitude _____ is exerted on the _____ by the table.<\/p>\n

ANSWER:<\/p>\n

Part C<\/p>\n

Do the downward force in Part A and the upward force in Part B constitute a 3rd law pair?<\/p>\n

You did not open hints for this part.<\/p>\n

ANSWER:<\/p>\n

the table<\/p>\n

gravity<\/p>\n

inertia<\/p>\n

.<\/p>\n

6 N \/ table<\/p>\n

5 N \/ table<\/p>\n

5 N \/ book<\/p>\n

6 N \/ book<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 6\/12<\/p>\n

Part D<\/p>\n

The reaction to the force in Part A is a force of magnitude _____, exerted on the _____ by the _____. Its direction<\/p>\n

is _____ .<\/p>\n

You did not open hints for this part.<\/p>\n

ANSWER:<\/p>\n

Part E<\/p>\n

The reaction to the force in Part B is a force of magnitude _____, exerted on the _____ by the _____. Its direction<\/p>\n

is _____.<\/p>\n

ANSWER:<\/p>\n

Part F<\/p>\n

Which of Newton’s laws could we have used to predict that the forces in Parts A and B are equal and opposite?<\/p>\n

Check all that apply.<\/p>\n

ANSWER:<\/p>\n

yes<\/p>\n

no<\/p>\n

5 N \/ earth \/ book \/ upward<\/p>\n

5 N \/ book \/ table \/ upward<\/p>\n

5 N \/ book \/ earth \/ upward<\/p>\n

5 N \/ earth \/ book \/ downward<\/p>\n

5 N \/ table \/ book \/ upward<\/p>\n

5 N \/ table \/ earth \/ upward<\/p>\n

5 N \/ book \/ table \/ upward<\/p>\n

5 N \/ table \/ book \/ downward<\/p>\n

5 N \/ earth \/ book \/ downward<\/p>\n

Newton’s 1st law<\/p>\n

Newton’s 2nd law<\/p>\n

Newton’s 3rd law<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 7\/12<\/p>\n

Part G<\/p>\n

Which of Newton’s laws could we have used to predict that the forces in Parts B and E are equal and opposite?<\/p>\n

Check all that apply.<\/p>\n

ANSWER:<\/p>\n

PSS 5.1: Equilibrium problems<\/p>\n

Learning Goal:<\/p>\n

To practice Problem\u00adSolving Strategy 5.1 Equilibrium problems<\/p>\n

A 20\u00ad loudspeaker is suspended 2.0 below the ceiling by two ropes that are each 30 from vertical. What is the<\/p>\n

tension in the ropes?<\/p>\n

PROBLEM\u00adSOLVING STRATEGY 5.1 Equilibrium problems<\/p>\n

PREPARE First check that the object is in equilibrium: Does ?<\/p>\n

An object at rest is in static equilibrium.<\/p>\n

An object moving at a constant velocity is in dynamic equilibrium.<\/p>\n

Then identify all forces acting on the object and show them on a free\u00adbody diagram. Determine which forces are known<\/p>\n

and which you need to solve for.<\/p>\n

SOLVE An object in equilibrium must satisfy Newton\u2019s second law for the case where . In component form, the<\/p>\n

requirement is<\/p>\n

and .<\/p>\n

You can find the force components that go into these sums directly from your free\u00adbody diagram. From these two<\/p>\n

Newton’s 1st law<\/p>\n

Newton’s 2nd law<\/p>\n

Newton’s 3rd law<\/p>\n

kg m \u2218<\/p>\n

a\u20d7= 0<\/p>\n

\u20d7<\/p>\n

a\u20d7= 0<\/p>\n

\u20d7<\/p>\n

\u2211Fx = max = 0 \u2211Fy = may = 0<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 8\/12<\/p>\n

equations, solve for the unknown forces in the problem.<\/p>\n

ASSESS Check that your result has the correct units, is reasonable, and answers the question.<\/p>\n

PREPARE<\/p>\n

Determine what sort of equilibrium your system is in. Then, draw a free\u00adbody diagram and determine useful<\/p>\n

relationships between the forces.<\/p>\n

Part A<\/p>\n

Which of the following statements are correct about the situation described in the introduction?<\/p>\n

Check all that apply.<\/p>\n

ANSWER:<\/p>\n

Part B<\/p>\n

Identify the forces acting on the loudspeaker and then draw them on the free\u00adbody diagram.<\/p>\n

Draw the vectors starting from the black dot. The location and orientation of the vectors will be graded. The<\/p>\n

length of the vectors will not be graded.<\/p>\n

ANSWER:<\/p>\n

The loudspeaker is in static equilibrium.<\/p>\n

The loudspeaker is in dynamic equilibrium.<\/p>\n

The loudspeaker is not in static equilibrium, because it is not on the ground.<\/p>\n

The loudspeaker is not in dynamic equilibrium, because it is accelerating.<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 9\/12<\/p>\n

Part C<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

SOLVE<\/p>\n

Use the conditions for equilibrium to determine the tensions in the two ropes.<\/p>\n

Part D<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

ASSESS<\/p>\n

Determine whether your answer makes sense.<\/p>\n

Part E<\/p>\n

This question will be shown after you complete previous question(s).<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 10\/12<\/p>\n

Problem 5.13<\/p>\n

A horizontal rope is tied to a 40 box on frictionless ice.<\/p>\n

Part A<\/p>\n

What is the tension in the rope if the box is at rest?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Part B<\/p>\n

What is the tension in the rope if the box moves at a steady 9.0 ?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Part C<\/p>\n

What is the tension in the rope if the box has = 9.0 and = 5.0<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Problem 5.17<\/p>\n

A woman has a mass of 50.0 .<\/p>\n

Part A<\/p>\n

What is her weight on earth?<\/p>\n

ANSWER:<\/p>\n

kg<\/p>\n

T = N<\/p>\n

m\/s<\/p>\n

T = N<\/p>\n

vx m\/s ax m\/s<\/p>\n

2<\/p>\n

T = N<\/p>\n

kg<\/p>\n

wearth = N<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 11\/12<\/p>\n

Part B<\/p>\n

What is her mass on the moon, where ?<\/p>\n

ANSWER:<\/p>\n

Part C<\/p>\n

What is her weight on the moon, where ?<\/p>\n

ANSWER:<\/p>\n

Problem 5.23<\/p>\n

Part A<\/p>\n

A 0.57 bullfrog is sitting at rest on a level log. How large is the normal force of the log on the bullfrog?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Part B<\/p>\n

A second 0.57 bullfrog is on a log tilted 23 above horizontal. How large is the normal force of the log on this<\/p>\n

bullfrog?<\/p>\n

Express your answer using two significant figures.<\/p>\n

ANSWER:<\/p>\n

Problem 5.25<\/p>\n

Bonnie and Clyde are sliding 430 bank safe across the floor to their getaway car. The safe slides with a constant<\/p>\n

speed if Clyde pushes from behind with 420 of force while Bonnie pulls forward on a rope with 260 of force.<\/p>\n

g = 1.62 m\/s<\/p>\n

2<\/p>\n

mmoon = kg<\/p>\n

g = 1.62 m\/s<\/p>\n

2<\/p>\n

wmoon = N<\/p>\n

kg<\/p>\n

n = N<\/p>\n

kg<\/p>\n

\u2218<\/p>\n

n = N<\/p>\n

kg<\/p>\n

N N<\/p>\n

7\/20\/2015 Assignment 3<\/p>\n

https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 12\/12<\/p>\n

Part A<\/p>\n

What is the safe’s coefficient of kinetic friction on the bank floor?<\/p>\n

ANSWER:<\/p>\n

Score Summary:<\/p>\n

Your score on this assignment is 0.0%.<\/p>\n

You received 0 out of a possible total of 30 points.<\/p>\n

\u03bc = k<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

Mass (kg) Weight (N)<\/p>\n

\u00a0<\/p>\n

Acceleration (m\/s2)<\/p>\n

\u00a0<\/p>\n

Scale Reading (N)<\/p>\n

\u00a0<\/p>\n

Newton’s Second Law<\/p>\n

Part A, Section B<\/p>\n

An object with mass m = 100 kg is sitting on a scale in an elevator. Use Excel to determine the<\/p>\n

reading on the scale (in Newtons) for the following four situations.<\/p>\n

i) Elevator accelerating upward at 3 m\/s2<\/p>\n

ii) Elevator moving at constant speed<\/p>\n

iii) Elevator accelerating downward at -3 m\/s2<\/p>\n

iv) Elevator accelerating downward at -9.8 m\/s2<\/p>\n

Input: Acceleration of the elevator<\/p>\n

Output: Reading on the scale<\/p>\n

\u00a0<\/p>\n

Mass (kg)<\/p>\n

20<\/p>\n

40<\/p>\n

20<\/p>\n

20<\/p>\n

\u00a0<\/p>\n

Velocity (m\/s) Force (N)<\/p>\n

20<\/p>\n

20<\/p>\n

40<\/p>\n

20<\/p>\n

\u00a0<\/p>\n

-20<\/p>\n

-20<\/p>\n

-40<\/p>\n

-40<\/p>\n

\u00a0<\/p>\n

Acceleration (m\/s2)<\/p>\n

\u00a0<\/p>\n

Time to come to rest (s) Stopping distance (m)<\/p>\n

\u00a0<\/p>\n

Newton’s Second Law<\/p>\n

Part B, Section A<\/p>\n

An object with a mass m is moving with an initial speed vand is acted on by a single force F in<\/p>\n

the opposite direction of its motion. Use Excel to determine how long it will take the object to<\/p>\n

come to rest and how far the object travels until it stops.<\/p>\n

i) If the mass is doubled, what is the effect on the time? On the stopping distance?<\/p>\n

ii) If the initial velocity is doubled, what is the effect on the time? On the stopping distance?<\/p>\n

iii) If the force is doubled, what is the effect on the time? On the stopping distance?<\/p>\n

\u00a0<\/p>\n

Input: Mass, initial velocity, force<\/p>\n

Output: Acceleration, time to come to rest, stopping distance<\/p>\n

\u00a0<\/p>\n

Mass (kg)<\/p>\n

\u00a0<\/p>\n

Fx (N)<\/p>\n

\u00a0<\/p>\n

20,000<\/p>\n

\u00a0<\/p>\n

50,000<\/p>\n

\u00a0<\/p>\n

vx (m\/s)<\/p>\n

\u00a0<\/p>\n

vy (m\/s)<\/p>\n

\u00a0<\/p>\n

ay (m\/s2)<\/p>\n

\u00a0<\/p>\n

100,000<\/p>\n

\u00a0<\/p>\n

time (s)<\/p>\n

\u00a0<\/p>\n

ax (m\/s2)<\/p>\n

\u00a0<\/p>\n

Fy (N)<\/p>\n

\u00a0<\/p>\n

Newton’s Second Law<\/p>\n

Part B, Section B<\/p>\n

\u00a0<\/p>\n

v (m\/s)<\/p>\n

\u00a0<\/p>\n

x (m)<\/p>\n

\u00a0<\/p>\n

y (m)<\/p>\n

\u00a0<\/p>\n

A rocket ship, with mass m = 20,000kg and engines mounted perpendicularly in the x- and y-directions,<\/p>\n

fires both rockets simultaneously. The engine oriented in the x-direction fires for 3 s and shuts off. The<\/p>\n

engine oriented in the y-direction fires for 7 s and shuts off. The force from the engine in the x-direction is<\/p>\n

50,000 N, and the force from the engine in the y-direction is 100,000 N. Make a scatter plot of the y-position<\/p>\n

\u00a0<\/p>\n

d (m)<\/p>\n

\u00a0<\/p>\n

0<\/p>\n

0.5<\/p>\n

1<\/p>\n

1.5<\/p>\n

2<\/p>\n

2.5<\/p>\n

3<\/p>\n

3.5<\/p>\n

4<\/p>\n

4.5<\/p>\n

5<\/p>\n

5.5<\/p>\n

6<\/p>\n

6.5<\/p>\n

7<\/p>\n

7.5<\/p>\n

8<\/p>\n

8.5<\/p>\n

9<\/p>\n

9.5<\/p>\n

10<\/p>\n

\u00a0<\/p>\n

of each particle as a function of the x-position, showing the trajectory of the rocket.<\/p>\n

\u00a0<\/p>\n

Use Excel to determine the following.<\/p>\n

i) While the engines are firing, what is the acceleration of the rocket in the x- and y-directions?<\/p>\n

ii) After 7 s, what is the velocity of the rocket in the x- and y-directions?<\/p>\n

iii) After 7 s, what is the speed of the rocket?<\/p>\n

iv) After 7 s, how far has the rocket travelled in the x-direction? How far has it travelled in the y-direction?<\/p>\n

After 10 s?<\/p>\n

v) After 7 s, what is the displacement of the rocket? After 10 s? Is the displacement of the rocket the<\/p>\n

same as the distance travelled? Explain.<\/p>\n

\u00a0<\/p>\n

Rocket Trajectory<\/p>\n

\u00a0<\/p>\n

y<\/p>\n

\u00a0<\/p>\n

vi) If the mass of the rocket is doubled, what happens to the displacement?<\/p>\n

\u00a0<\/p>\n

12<\/p>\n

10<\/p>\n

8<\/p>\n

6<\/p>\n

4<\/p>\n

2<\/p>\n

0<\/p>\n

\u00a0<\/p>\n

Output: ax, ay, vx, vy, x, y, d<\/p>\n

\u00a0<\/p>\n

0<\/p>\n

\u00a0<\/p>\n

2<\/p>\n

\u00a0<\/p>\n

4<\/p>\n

\u00a0<\/p>\n

6<\/p>\n

x<\/p>\n

\u00a0<\/p>\n

8<\/p>\n

\u00a0<\/p>\n

10<\/p>\n

\u00a0<\/p>\n

12<\/p>\n

\u00a0<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

7\/20\/2015 Assignment 3 https:\/\/session.masteringphysics.com\/myct\/assignmentPrintView?assignmentID=3680848 1\/12 Assignment 3 Due: 11:59pm on Sunday, July 26, 2015 You will receive no credit for items you complete after the assignment is due. Grading Policy Tactics Box 4.1 Drawing Force Vectors Learning Goal: To practice Tactics Box 4.1 Drawing force vectors. To visualize how forces are exerted on objects we […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[],"class_list":["post-11756","post","type-post","status-publish","format-standard","hentry","category-homework-help"],"_links":{"self":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts\/11756","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/comments?post=11756"}],"version-history":[{"count":0,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts\/11756\/revisions"}],"wp:attachment":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/media?parent=11756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/categories?post=11756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/tags?post=11756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}