For a problem i have on homework, im trying to figure out how far away lighting is by the distance of the lighting and the thunder.
There is a 10 second delay between lightning and thunder. The speed of sound is 761 mph. So too figure out the distance you have too divide speed of sound with the time. so too figure out the time you next have too figure out how much of an hour is 10 seconds. so 10 / 60 = 0.166666667
Then divide that with the speed of sound and you get 126.833334.
So the question is....
Did I figure out the answer or did I do something wrong?
761 mph/60 minutes/60 seconds = .211388889 MPS = 761/3600 MPS
We can also use scientific conversion to show this:
761 MPH x ( [1/60 minutes]/1 hour) x ( [1/60 seconds]/1 minute) = 761 MPH x 1/60 MPM x 1/60 MPS = .211388889 MPS = 761/3600 MPS
That is now in seconds. So multiply by 10 and move the decimal over.
The lightning is 761/360 miles away.
2.11388889 miles = 25.36667 blocks = 3401.981164 m = 11161.33333 ft
Just take 761 ft and multiply it by 10 sec. If it took ten seconds for the thunder to reach you and sound travels at 761 feet per second. 10 X 761 = Number of feet away. 7610 ft.
Thursday, July 22, 2010
Force of seat upon the rider of a Ferris wheel?
A 75 kg person rides a Ferris wheel which is rotating uniformly. The centripetal force acting on the person is 45 N. What force does the seat exert on the rider at the top and bottom of the ride?
I know the answers (690 N at the top, 780 N at the bottom) but I
I know the answers (690 N at the top, 780 N at the bottom) but I
Bright bright moon and a shooting star ? a.s.a.p?
The moon was really bright as almost as bright as the sun and a little big i think to where when i looked at it and it almost blinded me. Then when i looked down i saw a shooting star a tiny one i did make a wish not sure if it will come true or not i hope so. I am not sure if there was a star next to it or not don
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