Help with Science Project, please

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The discussion focuses on seeking assistance for a science project involving the construction of a catapult capable of launching a ping-pong ball up to 10 meters. Suggestions include researching trebuchet designs, which utilize counterweights for effective launching. Participants recommend searching online for detailed plans and instructions, particularly on educational and DIY websites. Video tutorials on platforms like YouTube are also suggested for visual guidance. Overall, the conversation emphasizes utilizing various online resources and seeking advice from knowledgeable peers for project success.
RaYip
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Help with Science Project, please!

I was wondering whether anyone here could help me with a science project I have. The assignment requires me to build a catapult/launcher that can launch a ping-pong ball up to a distance of 10 metres. I was wondering whether anyone here knows of any good websites that has instructions and plans on how to make one, or if any of you have any plans or anything, it would be very helpful.
 
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hmm, you could try a sort of trebuchet, an old catapult that used a counter-weight to throw the object pretty dam far.

just look for 'trebuchet' or something along those lines in google or any search engine.
 
Thank you in advance!

Sure, I would be happy to help you with your science project! Building a catapult or launcher can be a fun and challenging project. There are many resources available online that can provide instructions and plans for building one. I recommend checking out educational websites or science experiment websites for step-by-step instructions and materials lists. You can also try searching for "ping-pong ball catapult DIY" on YouTube for video tutorials. Additionally, asking for advice from teachers or classmates who have experience with similar projects can also be helpful. Good luck with your project!
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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