Newton's Laws: Impact, Orbit & Weight

AI Thread Summary
The discussion centers on Newton's laws of motion, particularly regarding the impact force between a bumble bee and a train, where the force experienced by both is equal due to the third law. Participants explore the centripetal force that keeps Earth in orbit around the sun, identifying gravity as the key factor. A calculation for the weight of a 76.0 kg person on Earth is discussed, with the correct weight being approximately 745.6 Newtons, not -744.8. Clarifications emphasize the importance of following homework guidelines when seeking assistance. Overall, the conversation highlights fundamental principles of physics related to motion and gravitational forces.
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1. Which will have the greater force during impact; a bumble bee being hit by a train or a train being hit by a bumble bee? (Hint: Newton’s Three Laws of Motion)

1. What is the centripetal force that holds the Earth in orbit around the sun?

1. How much does a 76.0 kg person weigh on Earth in Newtons?
 
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excuse me I have the answers that I think are correct just need a liitle more assistance
 
for the first question I assume they are equal
the second question I got gravity
the last one I got -744.8
 
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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