Swimmers starting from rest slide down from the top of a slide and leave the end of the slide traveling horizontally. A person hits the water 5.00 m from the end of the slide in a time of .500 seconds after leaving the slide. Ignoring air resistance and friction, find the height.
A block has a mass of 2.0 kg sliding on a frictionless surface toward a relaxed spring of lenght .30 m. When striking the spring the block continues to slide to the right until the spring is squeezed down to a length of .10 m, at which the block momentarily comes to rest. if the block's initial speed is 10.0 m/s, what is the average force exerted by the spring in brining the block back to rest? Use the impulse-momentum theorem to estimate the time it took to stop the block, from the moment it first came into contact with the spring until it came to rest.
2007-12-07 05:46:09 · 4 answers · asked by jdowgg88 1 in Science & Mathematics ➔ Physics
ahhhhhhh why won't you kids stop cheating and learn stuff for yourself!!!!!!!!! ask your teacher to explain if you don't get it.
i swear the internet may just be the death of intelligence and education yet
2007-12-07 05:54:28 · answer #1 · answered by A P 3 · 2⤊ 1⤋
You need to treat horizontal and vertical components seperately. So if the person is sliding horizontally, there is no downward initial velocity regardless of how fast the person is going horizontally. Meaning the only downward force on the person is gravity. Acceleration due to gravity is (-9.8m/s^2).
So use the formula:
Df=Di+ViT+.5AT^2
Where Df is the final displacement from the surface of the water (0 m), Di is initial displacement from surface of the water (Height of the slide), Vi is initial veritcal acceleration (0m/s), T is time of flight (.5 seconds), and A is acceleration due to gravity.
0=Di+0+.5(-9.8)(.5^2), Di = 1.225 m
2.) I'm not too positive how to do the second part. Is the spring massless? Does it give ou an acceleration?
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A P: The internet is a resource to learn. If he's not understanding it from his teacher, what's wrong with asking people online? Would you complain if he asked his parents how to do it? Why can't you teach the person yourself if you know it? Don't be a cynical dick.
2007-12-07 07:01:29 · answer #2 · answered by Dubya 3 · 0⤊ 0⤋
I made it 9.05. And the second question: 1.07 s.
2007-12-07 05:56:27 · answer #3 · answered by za 7 · 0⤊ 0⤋
11.18?
2007-12-07 05:50:42 · answer #4 · answered by Bilbo baggins 2 · 0⤊ 0⤋