PhysicsA_Mod3_Homework
pdf
keyboard_arrow_up
School
Educational Outreach Academy *
*We aren’t endorsed by this school
Course
2
Subject
Aerospace Engineering
Date
Nov 24, 2024
Type
Pages
5
Uploaded by CoachAntelopeMaster1374
Name:
Short Answer
1.
Describe the process you would use to find the magnitude (length) of the resultant of
two perpendicular vectors, one in the x‐direction, and another in the y‐direction.
2.
Lisa is solving a vector problem, and the answer she arrives at is “17.4 m/s at 11°.” Why
is this answer, as it is currently written, not complete?
3.
When solving projectile problems, you may hear that “motion in the x‐ and y‐directions
are independent of each other.” What does this mean, in terms of your problem
solving?
4.
When solving projectile motion problems where the projectile is launched at an angle,
the first step is to find the x‐ and y‐component of the initial velocity. Why is this helpful
in solving these types of problems?
—Go on to next page—
Module 3 Homework
Directions: Complete the following problems showing all of your work. Turn in
your completed worksheet to your teacher.
5.
A curious physics student asked her teacher “how quickly is Earth moving through
space?” Using the concept of relative velocity, explain why this question does not have
an answer.
6.
Two students are having a debate about the forces acting on a stationary object.
Lawrence says that, because the object is not moving, there are no forces acting on it.
Paula says that there can still be forces acting on an object, even if it is stationary. Which
student is correct, and why?
Practice
7.
Candace throws a ball so that it has a horizontal velocity of 6.2 m/s, and vertical velocity
of 2.1 m/s. What is the velocity vector of this ball right as she releases it?
8.
A pigeon is walking around a courtyard, looking for food. The pigeon walks 4.0 m west,
2.5 m north, 1.1 m west, and 7.3 m south. What is the pigeon’s final displacement
vector?
9.
Jeremy is walking through the woods, marking diseased trees for removal. He walks for
2.44 km, at a heading of 13.9° west of north. Based on this, how far north and how far
west has he walked from his starting position?
—Go on to next page—
10.
Louisa and Tam are driving in a car. They travel 450 m at a heading of 15° south of west,
then 230 m at a heading of 36° south of west. What is their final displacement vector
after the second leg?
11.
A round stone rolls towards the edge of 21 meter cliff. As it reaches the edge of the cliff,
it is moving forward with a speed of 6.7 m/s. How far, horizontally, from the cliff face
will the rock land?
12.
Stacy uses a giant sling shot to launch a water balloon at an angle of 27° above
horizontal. If the speed of the balloon is 19.7 m/s, what are the horizontal (x) and
vertical (y) components of the
initial
velocity?
13.
A tee‐shirt cannon is used to launch tee‐shirts into a crowd. If one shirt is launched with
an initial velocity of 24.4 m/s, at an angle of 19.5° above horizontal, what will be the x‐
and y‐components of the
final
velocity vector?
14.
If a projectile is launched upward with a speed of 7.44 m/s, and at an angle of 40.1°
above horizontal, what is the hang time of this projectile?
—Go on to next page—
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
15.
If a projectile is launched upward with a speed of 39.1 m/s, and at an angle of 10.4°
above horizontal, what is the range of this projectile?
16.
Carrie is going for a morning run on the deck of a cruise ship. Using the ship as her frame
of reference, she is running east at a speed of 2.76 m/s. If the ship is traveling north at a
speed of 9.38 m/s, what is Carrie’s velocity with respect to a stationary point on the
water?
Application
For a group project, a team of physics students is trying to develop a device that can launch
marbles so that they land in a predictable location every time.
17.
The current version of the device applies a 1.81 Newton force to the marble at an angle
of 51° above horizontal. What are the horizontal and vertical components of this force
vector?
18.
The students are not getting the marbles to travel as far as they would like. What are
some changes they could make to the device so that they get a greater range?
—Go on to next page—
19.
The current setup of the device launches the marbles at a speed of 9.05 m/s. If the
students adjust the launch angle from 51° to 35°, what effect will this change have on
the marbles’ hang times?
20.
During one launch, when the 4.0‐gram marble is at the peak of its trajectory, moving to
the right, the only forces acting on it are the force of gravity, and a 0.01 N force of drag
to the left. Draw the free body diagram for this situation.