Projectile motion of a fired cannon ball

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Homework Help Overview

The discussion revolves around the projectile motion of a cannonball fired at an angle and from a height, specifically focusing on the time it takes to hit a vertical building 400 m away. The problem involves two scenarios: one where the cannonball is fired at an angle of 36.9° and another where it is fired horizontally from a 150-m-high cliff.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the time it takes for the cannonball to hit the building in both scenarios, with one participant indicating they calculated the time for the angled shot but are uncertain about the horizontal launch. Questions arise regarding the horizontal component of velocity and the initial velocity value.

Discussion Status

The discussion is ongoing, with participants clarifying their understanding of the problem setup and exploring the implications of the initial velocity on the projectile's motion. There is no explicit consensus, but some guidance is being offered regarding the interpretation of the horizontal launch scenario.

Contextual Notes

Participants are working under the constraints of the problem as posed, including the specific distances and angles provided. There is an emphasis on understanding the components of motion without resolving the calculations fully.

KEVIN Phlem
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1. A cannonball is fired toward a vertical building 400 m away
with an initial velocity of at 36.9° above the horizontal.
The ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 s.

2. If the cannonball in the previous question is fired horizontally
from a 150-m-high cliff, but still 400 m from the building, then
the ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 sI used x =(Vo * Cos 36.9)t and got 5.0 s, which is correct, but i don't know how to solve for #2
 
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KEVIN Phlem said:
1. A cannonball is fired toward a vertical building 400 m away
with an initial velocity of at 36.9° above the horizontal.
The ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 s.

2. If the cannonball in the previous question is fired horizontally
from a 150-m-high cliff, but still 400 m from the building, then
the ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 sI used x =(Vo * Cos 36.9)t and got 5.0 s, which is correct, but i don't know how to solve for #2
What is the horizontal component of velocity in this case?

By the way: What is the value of V0 ?
 
100 m/s, sorry
 
KEVIN Phlem said:
100 m/s, sorry
That answers which question?
 
SammyS said:
That answers which question?
The first one.
 
KEVIN Phlem said:
The first one.
KEVIN Phlem said:
The first one.
In that case it must have answered both.

V0 is the horizontal component if it fired horizontally.
 

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