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A bouncing ball |
2002-12-14 |
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From Eman:
Q : When a childís ball is dropped from a height h metres on to a hard, flat floor, it rebounds to a height of 3/5h metres. The ball is dropped initially from a height of 1.2m. - Find the maximum height to which the ball rises after two bounces.
- Find the total distance that the ball has traveled when it hits the floor for the tenth time.
- Assuming that the ball continues to bounce in the same way indefinitely, find the total distance that the ball travels.
Answered by Penny Nom. |
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Two modes |
2002-12-12 |
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From ali:
I have a math assignment to pick the mode in a set of data. 12 and 21 both appear twice in the data set. What is the mode?
Answered by Penny Nom. |
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Units |
2002-12-12 |
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From Debbie:
The general equation for a parabola is y = ax 2 + bx + c, where a, b, c are constants. What are the units of each constant if y and x are in meters?
Answered by Penny Nom. |
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Construct a pentagon |
2002-12-12 |
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From Mary:
We were wondering what the instructions/formula, step-by-step, is to make a pentagon.
Answered by Chris Fisher and Penny Nom. |
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Volume d'une calotte ellipsoidale |
2002-12-11 |
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From Fabien:
Quel est le volume d'une calotte d'ellipsoide de hauteur h (ellipse de longueurs d'axes a, b, et c)? Je souhaite une formule exacte, un développement limité, voire une intégrale à estimer numériquement. Quelle méthode pour le calculer ?
Answered by Claude Tardif. |
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A sphere with a hole - cylindrical shells |
2002-12-11 |
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From Kathy:
Suppose you make napkin rings by drilling holes with different diameters through two wooden balls (which also have different diameters.) You discover that both napkin rings have the same height, h. - Guess which ring has more wood in it and why.
- Check you guess: Use cylindrical shells to compute the volume of a napkin ring created by drilling a hole with radius r through the center of a sphere of radius R and express the answer in terms of h.
Answered by Penny Nom. |
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Factoring |
2002-12-11 |
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From Larry:
Question:
how do u factor trinonmials
EX: X 3 + Y 3
X 3 - 8Y 3
8X 2 - 72
64A 3 - 125B 6
Answered by Penny Nom. |
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Find a, b and c |
2002-12-10 |
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From Sameer:
Question:
a+b+c=180
b=a+(120/2-5)
c=b-(130-10)/6
a=?
b=?
c=?
Answered by Penny Nom. |
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Fractions |
2002-12-10 |
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From Jean:
What are some activities to use with advanced students in grade 7 to apply their knowledge of fractions and decimals. I'm looking for a project type of activity.
Answered by Diane Hanson. |
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Quadratic equations |
2002-12-10 |
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From Katie:
just bugging the hell outta me and I cannot figure it out for the life of me.
1)x-2x-1 =0
Find both roots. You must simplify both of your roots. This equation requires the use of the Quadratic Formula. I have tried everything for this and I am still either getting the wrong answers, and end up getting really frustrated. If you could find the answers and tell me how you did it I would greatly appreciate it! Then the second problem is
2) The square of a certain negative number is equal to 70 decreased by 3 times the number. Find the answer! On this one I set it up but still came out with the wrong answer. So if you could help me on this one I would greatly appreciate it!
Answered by Penny Nom. |
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y = 1 - sin(x + 60) |
2002-12-10 |
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From Eman:
Sketch the graph of y = 1 - sin(x+60). for 0 <= x<= 360, giving the coordinates of the maximum and minimum points and the pints where the curves crosses the y axis.
Answered by Penny Nom. |
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Une plantation d'arbres |
2002-12-10 |
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From Eric:
créer une plantation d'arbres de 6 rangées de 5 arbres, pour un total de 15 arbres . Je n'arrive pas à trouver la forme géométrique.Merci de me répondre que j'ai l'air moins bête envers mon gamin.
Answered by Claude Tardif. |
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ALL of the possible 3 digit combinations of 0 - 9 |
2002-12-09 |
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From Melissa:
I need to find out ALL of the possible 3 digit combinations of 0 - 9. Eg: 000,001,002,003. This is going to take me VERY LONG time. Any suggestions.
Answered by Penny Nom. |
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How many billions equal one trillion? |
2002-12-07 |
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From Ryan and Aylah:
How many billions equal one trillion?
We believe that the answer is one thousand times one billion equals one trillion. Please help us with the answer to this question.
Answered by Penny Nom. |
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A function that is onto but not one-to-one where f:N-->N |
2002-12-06 |
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From Lisa:
A function that is onto but not one-to-one where f:N-->N
Answered by Penny Nom. |
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