Solve Collision Questions: Cannonball Speed & Dog Mass

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Homework Help Overview

The discussion revolves around two collision problems involving a cannon and a cannonball, as well as a cart and a dog. The first problem concerns the speed of a cannonball after being fired, while the second problem involves determining the mass of a dog that jumps onto a moving cart.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the equations related to momentum conservation and express uncertainty about which principles apply to the problems. There are inquiries about the underlying principles of the equations presented.

Discussion Status

The conversation is ongoing, with participants seeking clarification on the principles behind the equations. Some guidance has been offered regarding the conservation laws, but explicit consensus on the approach has not been reached.

Contextual Notes

Participants are navigating through the application of conservation principles in collision scenarios, with some uncertainty about the specific equations to use and the assumptions involved.

rainy365days
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1. Jamie and Adam fire a cannon with a mass of 1150 kg. As the 14.5 kg cannonball leaves the cannon, the cannon recoils with a velocity of 1.75 m/s. How fast does the cannonball fly?

2. A 45 kg cart rolls along a railroad track at 4.0 m/s. A dog running at 7.6 m/s to catch up with the cart jumps on the cart. After the dog jumps on the cart, the cart is moving at 6.0 m/s. What is the mass of the dog?
2. m1v1 + m2v2 = (m1+m2)Vf

m1v1 + m2v2 = m1v1 + m2v2

(m1 + m2)*Vi = m1v1 + m2v2

3. I'm not sure what equation to use...
 
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rainy365days said:
1. Jamie and Adam fire a cannon with a mass of 1150 kg. As the 14.5 kg cannonball leaves the cannon, the cannon recoils with a velocity of 1.75 m/s. How fast does the cannonball fly?

2. A 45 kg cart rolls along a railroad track at 4.0 m/s. A dog running at 7.6 m/s to catch up with the cart jumps on the cart. After the dog jumps on the cart, the cart is moving at 6.0 m/s. What is the mass of the dog?

2. m1v1 + m2v2 = (m1+m2)Vf

m1v1 + m2v2 = m1v1 + m2v2

(m1 + m2)*Vi = m1v1 + m2v2


3. I'm not sure what equation to use...
Do you know what principle those equations are based on ?
 
SammyS said:
Do you know what principle those equations are based on ?

Collision? I'm sorry, I'm not exactly sure what you're asking.
 
rainy365days said:
Collision? I'm sorry, I'm not exactly sure what you're asking.

They're based on conservation of something .

Do you know what that something is?
 
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