Help w/ projecetile motion w/ angled launch problem

In summary, the conversation discusses a problem involving a bowling ball rolling off an angled roof. The question at hand is how long it takes the ball to hit the ground. The homework equation used is Δx=viΔt+1/2a(Δt)^2, and the person is having trouble isolating for t and obtaining the correct answer. There is some discussion about the angle of the roof and the height of the eaves, but ultimately it is determined that the problem is incalculable due to insufficient information provided. The exact question is given and it is clarified that there is only one part to the question.
  • #1
physicsgeek54
9
0

Homework Statement


A bowling ball rolls off an angled roof. The roof is sloped downward at 18.4 degrees and it is 12m above the ground. The question is how long does it take the ball to hit the ground?

Homework Equations


Δx=viΔt+1/2a(Δt)^2
I know this is the equation I have to use but I'm having trouble isolating t.

The Attempt at a Solution


I used quad formula and ended up getting Δt=1.56s but I don't think that's right. The working equation I got was Δt=(-2ghi)^(1/2)/g .I assumed Vi was 0. I don't know how to do this, help please!
 
Last edited:
Physics news on Phys.org
  • #2
physicsgeek54 said:

Homework Statement


A bowling ball rolls off an angled roof. The roof is sloped downward at 18.4 degrees and it is 12m above the ground. The question is how long does it take the ball to hit the ground?

Homework Equations


Δx=viΔt+1/2a(Δt)^2
I know this is the equation I have to use but I'm having trouble isolating t.

The Attempt at a Solution


I used quad formula and ended up getting Δt=1.56s but I don't think that's right. The working equation I got was Δt=(-2ghi)^(1/2)/g .I assumed Vi was. I don't know how to do this, help please!

How far down the roof did the ball roll before launching of the edge? In other words; at what speed did the ball leave the roof?

EDIT: and is the time you are after, the time taken after it leaves the roof, or the time taken after it was released at the ridge of the roof and began rolling?
 
Last edited:
  • #3
I think it might be missing some information.

the angle is there for some reason.
 
  • #4
That's all the info to this problem and I would assume it's asking for how the ball takes to hit the ground after it's left the roof.
 
  • #5
physicsgeek54 said:
That's all the info to this problem and I would assume it's asking for how the ball takes to hit the ground after it's left the roof.


If that is all the information that is provided then the answer is: "this problem is incalculable due to insufficient information"

Have you entered the question in the exact words in which the original question was stated?

It looks more like your interpretation of the question.
 
  • #6
Well, here's the exact question. A bowling ball rolls off an angled roof. The roof is sloped downward at 18.4°, and the eaves are 12.0 meters above the ground. a.)How long does it take the ball it hit the ground?
 
  • #7
physicsgeek54 said:
Well, here's the exact question. A bowling ball rolls off an angled roof. The roof is sloped downward at 18.4°, and the eaves are 12.0 meters above the ground. a.)How long does it take the ball it hit the ground?

What is part b, c, etc
 

FAQ: Help w/ projecetile motion w/ angled launch problem

What is projectile motion?

Projectile motion is the motion of an object through the air that is affected by gravity. It follows a curved path known as a parabola.

How does an angled launch affect projectile motion?

An angled launch affects projectile motion by adding a horizontal component of velocity to the object's vertical motion. This results in a curved path instead of a straight line.

What are the key equations used to solve projectile motion problems?

The key equations used to solve projectile motion problems are the equations for horizontal and vertical displacement, velocity, and acceleration. These are:

Horizontal displacement = initial horizontal velocity x time

Vertical displacement = initial vertical velocity x time + (1/2) x acceleration due to gravity x time^2

Horizontal velocity = initial horizontal velocity

Vertical velocity = initial vertical velocity + acceleration due to gravity x time

Acceleration = acceleration due to gravity

What are some factors that can affect projectile motion?

Some factors that can affect projectile motion include air resistance, the shape and mass of the object, and external forces such as wind or air currents.

How can I use the kinematic equations to solve an angled launch projectile motion problem?

To solve an angled launch projectile motion problem, you can use the kinematic equations to find the initial velocity, time of flight, and maximum height of the object. You can then use these values to determine the object's position at any given time during its motion.

Similar threads

Help w/ projecetile motion w/ angled launch problem
Replies
4
Views
2K
Maximum height of a spring toy launched at an angle
Replies
15
Views
3K
Relationship between Launch Angle & Horizontal Distance
Replies
15
Views
8K
Projectile Motion: Determining Launch Angle
Replies
5
Views
1K
What is the maximum height of a spring toy launched at an angle?
Replies
4
Views
3K
Find the Initial Velocity and Launch Angle for a Particular Trajectory
Replies
10
Views
3K
Average force and angle, collision problem
Replies
23
Views
2K
Relationship between Launch height and range of a projectile
Replies
15
Views
23K
Finding an angle of trajectory from a tangential launch.
Replies
1
Views
1K
Projectile Motion Launched at an Angle
Replies
4
Views
4K

Hot Threads

Recent Insights

Back
Top