# ETEC 420- applications of engineering technology

ETEC 420- applications of engineering technology

## Module 3

Assignment 3:

A 60N collar “A” can slide on a frictionless vertical rod and is connected as shown to a 65N experimental rocket.

1. Draw the free-body diagram from point A needed to determine the value of h for which the system is in equilibrium. Use your understanding of vector geometry and algebra to find h. Let the angle at B = 45ᴼ.
2. The premise of this experimental rocket is that once it engines start it is released from height h and takes off.
If the rocket accelerates an initial speed of 21 m/s2, what is its mass?
3. What is the potential moment force of the rocket about point A?
4. Divide the 10-meter tall rocket into two parts. A cone at the top and a cylinder for the rockets body. The top has a mass 1/3 that of the rockets total mass with a height of 2m and a radius of 0.5m. Be careful to keep your units consistent.
What is the mass moment of inertia for the rocket?

Discussion 3:

• Create a free body diagram and associated word problem for a system that you see in everyday life.
• Use the equations of equilibrium to evaluate all of the forces acting on the systems.
• Include a detailed description of the system and where you see with respect to your everyday life.

You are welcome to upload an actual picture of the system, use a picture that you have found on the internet that is similar to your system, a drawing of the system or create a generic depiction of the system using basic shapes. You may not replicate a system that has already been analyzed, such as those found in your book or are found online.