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Finding radius given chord length and distance to center |
2007-10-04 |
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From Venus:
a chord of 48mm long is 7mm from the center of the circle. What is the radius of the circle?
Answered by Stephen La Rocque. |
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Arc lengths, central angles and radii |
2007-10-04 |
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From Ashutosh:
Jose can remember that the length of an arc is 440cm, but he cannot remember the radius of the arc or the angle at the center. He does know that the angle was a whole number of degrees and the radius was less than 100cm. Find three possible angles and write down the size of each of the possible radii.
Answered by Stephen La Rocque. |
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Sum and difference of two mystery numbers |
2007-10-04 |
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From Donna:
The sum of two numbers is 39. The difference is 11. What are the numbers?
Answered by Stephen La Rocque. |
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Yards to feet |
2007-10-04 |
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From Celina:
A football field is 100 yards how many ft is it?
Answered by Stephen La Rocque. |
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Finding the last non-zero digits of large factorials |
2007-10-04 |
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From Mukesh:
i have to find last five non zero digits of integer which can be very large (
upto 10^12) . i can find last non zero digit of of any factorial. Now my problem is that
i have to find last five non zero digit of factorial and also i want to general method for
last K non zero digits of factorial n. For example 10!=3628800 so last non zero digit is 8 ,last two
non zero digit is 88 .....and last five non zero digit is 36288.
Answered by Victoria West. |
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Rolling a die repeatedly (you can't just add percentages) |
2007-10-04 |
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From Howard:
If my son has a 16.66% chance of rolling a particular number on a dice,
and he rolls for it 6 times, he knows (from experience) that his
odds of getting at least 1 right are not 100% (16.66% +16.66%+16.66% etc).
He asked me if there was an equation that would give him the correct
percentage chance of success when trying X times for a Y% chance
of something.
Answered by Victoria West. |
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How many sq yards did i use? |
2007-10-03 |
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From Rose:
i used 12 x 19 of carpet. how many sq yards did i use? What is the formula for this?
Answered by Victoria West. |
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les données sont inconsistantes |
2007-10-03 |
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From Mikee:
Bonjour,
Je me casse la tete depuis ce matin et la je donne ma langue au chat.
Je n'arrive pas a resoudre ce probleme.
J'ai 30 agents qui appellent dans la journee et realisent 322 questionnaires (long+court) telephonique avec une duree moyenne de conversation 294 secondes.
dans ces 322 qestionnaires :
-ils realisent 313 questionnaires Long avec une duree moyenne de 317 secondes.
-ils realisent 9 questionnaires Court avec une duree moyenne X.
je cherche X.
((Interviews réalisées*Durée moyenne de conversation)-(Interviews réalisées avec la question Q2*Durée moyenne de conversation avec la question Q2))/(Interviews réalisées-Interviews réalisées avec question Q2)=Durée moyenne de conversation sans la question Q2
Q2=questionnaire Long
Answered by Claude Tardif. |
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Hitting golf balls |
2007-10-03 |
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From Jessi:
Ben is out at the practice range hitting golf balls. How much further will a golf ball with an initial speed of 75.0 m/s go when projected at 45.0 degree than when projected at 30.0 degree?
Answered by Stephen La Rocque. |
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Will the stone catch up the parachute? |
2007-10-03 |
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From anoi90:
a small parachute dropped from a 30.0 m high cliff falls with a constant velocity of 1.20 m/s. 20.0 s after the parachute is dropped, a stone is dropped from a cliff. Will the stone catch up the parachute before it reaches the ground? (Include numerical proof!)
Answered by Stephen La Rocque. |
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Gas and oil at a 50:1 ratio |
2007-10-03 |
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From Cindy:
How much gas and oil do you put in a 1.7 litre jug at a 50:1 ratio?
Answered by Stephen La Rocque. |
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What is the total surface area of a cylinder? |
2007-10-03 |
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From MATT:
what is the total surface area of a cylinder with outside diameter 40 cm. thickness 10cm. and length 2m. Work in cm^2
Answered by Stephen La Rocque. |
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Square feet in 1/2 an acre |
2007-10-03 |
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From Audrey:
How many feet would be in a 1/2 acre of land.
Answered by Stephen La Rocque. |
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A sheet of corrugated iron |
2007-10-03 |
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From Ashutosh:
A sheet of corrugated iron has corrugations based on the arc of a circle of radius of 3 cm and a central angle of 180 degrees. How many corrugations are formed when a flat sheet of steel 1 metre wide is bent to form a sheet of corrugated iron?
Answered by Stephen La Rocque. |
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Equivalent fractions |
2007-10-03 |
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From kiki:
I want to know how to this equivalent decimal for 6.0250.
Answered by Stephen la Rocque and Penny Nom. |
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