4-in, dia. V; = 200 fps Fixed jet ´cart = Ve Water

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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2.30 A cart is moved by the action of a high-speed jet as shown. If the cart moves on frictionless wheels, determine the initial acceleration of the cart (the mass of the water in the cart is negligible). The mass of the cart is lO slugs and the cart starts from rest. What equation governs the cart velocity Vc if the water collected in the cart is not neglected? A numerical solution using the computer could be developed.

Hint: Use Conservation of Mass to develop a differential equation for mass as a function of time, m(t). Use Conservation of Momentum to develop a differential equation for Vc. You must retain the inertial force term because the coordinate system is attached to the cart, and the cart is moving. You have 2 coupled differential equations that must be solved numerically. (The numerical solution is not a part of this problem, but will be provided!)

**Diagram Explanation for Educational Use**

This diagram illustrates the basic principles of fluid dynamics and jet propulsion.

1. **Fixed Jet:**
   - A fixed jet emits water at a velocity of \( V_j = 200 \, \text{fps} \).

2. **Cart System:**
   - The cart is shown on wheels allowing it to move horizontally over a surface.
   - The cart is filled with water and has a vertical outlet pipe.

3. **Components and Motion:**
   - The outlet pipe has a diameter of 4 inches.
   - Water from the fixed jet is directed into the cart, and then it exits through the vertical pipe, causing the cart to move in the opposite direction.
   - The velocity of the cart, \( V_{\text{cart}} \), is indicated to be equal to the velocity of the exiting water, \( V_e \).

This setup demonstrates the principle of conservation of momentum, as the momentum of the water jet is transferred to the cart, propelling it forward. Understanding these concepts is essential for studying various applications in physics and engineering, such as propulsion systems.
Transcribed Image Text:**Diagram Explanation for Educational Use** This diagram illustrates the basic principles of fluid dynamics and jet propulsion. 1. **Fixed Jet:** - A fixed jet emits water at a velocity of \( V_j = 200 \, \text{fps} \). 2. **Cart System:** - The cart is shown on wheels allowing it to move horizontally over a surface. - The cart is filled with water and has a vertical outlet pipe. 3. **Components and Motion:** - The outlet pipe has a diameter of 4 inches. - Water from the fixed jet is directed into the cart, and then it exits through the vertical pipe, causing the cart to move in the opposite direction. - The velocity of the cart, \( V_{\text{cart}} \), is indicated to be equal to the velocity of the exiting water, \( V_e \). This setup demonstrates the principle of conservation of momentum, as the momentum of the water jet is transferred to the cart, propelling it forward. Understanding these concepts is essential for studying various applications in physics and engineering, such as propulsion systems.
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