Building a car without a mousetrap i'm desperate

AI Thread Summary
To build a car without a mousetrap, consider using a lightweight material like styrofoam and attaching a fan for propulsion. The idea of using a fan is seen as innovative, though some participants express concern that it may not align with the project's goal of creating a physics-based contraption. Suggestions include focusing on mechanisms that utilize basic physics principles, such as rubber bands or gravity. The challenge lies in balancing creativity with the project's requirements for complexity. Ultimately, participants emphasize the importance of experimenting with different propulsion methods to achieve the desired outcome.
kailey
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I am supposed to make a car similar to that of a mousetrap car, except without using a mousetrap. I have basic materials and I am completley dumfounded when it comes to making the car "go."

please help me! i am so desperate!

i originally thought that using a car to make the car go would be a good idea but i have no idea how to rig that up.
 
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a fan?
 
that's actually a really good idea. i hadn't thought of that. i just can't figure out how to rig that up.
 
use styrofoam (or something equally light), stick a fan on the back. Add wheels. Voila.
 
idk i think that would be considered "cheating." it's supposed to be some complicated physics contraption.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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