- #1
princessotes
- 2
- 0
Homework Statement
Humpty Dumpty had a great fall from a roof. It took him 2.25s to fall. How high was the roof?
Kinematics Problem: How High Was Humpty Dumpty's Fall?
- Thread starter princessotes
- Start date
AI Thread Summary
Humpty Dumpty fell from a roof in 2.25 seconds, prompting a discussion on calculating the height of the fall. The problem suggests that he experienced free fall, with initial velocity (u) at 0 and acceleration (a) equal to gravity (g). The relevant equation for height (H) is H = ut + 1/2at². Participants noted the importance of correctly inputting values into the calculator for accurate results. The conversation emphasizes the need for clarity in understanding the motion involved in the problem.
Humpty Dumpty had a great fall from a roof. It took him 2.25s to fall. How high was the roof?
- #2
ehild
Science Advisor
Homework Helper
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princessotes said:
The policy here is that you have to show your attempt at a solution. How does Humpty-Dumpty move? with constant velocity? Or does he accelerate?
- #3
harsh_sinha
- 11
- 2
It seems like a case of free-fall.
u=0,a=g and t is given
Use the equation H=ut+1/2at2
But this is what I presume.There isn't any clear information about the motion of Humpty Dumpty.
u=0,a=g and t is given
Use the equation H=ut+1/2at2
But this is what I presume.There isn't any clear information about the motion of Humpty Dumpty.
- #4
princessotes
- 2
- 0
Thanks, I got it.
I used H=ut+1/2at2
but it seemed I was inputting the wrong digit to the calculator
I used H=ut+1/2at2
but it seemed I was inputting the wrong digit to the calculator
Neglect gravity other than that of water; neglect friction.
F1=ρgsh=1000*10*1*(1+4)=50000 N;
F1=ρgsh=1000*10*0.1*4=4000 N;
F3=50000-4000=46000 N?
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...
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 .
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