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Orbital velocity |
2006-02-15 |
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Lizzie pose la question :
Assume the world is a spherical planet with a diameter of 1600 KM. with a uniform density or 5200 KM.
It the moon is in a circular orbit of 630 KM. above the surface of the world,what is it's orbital velocity in metres per second?Round to the nearest WHOLE number.
Stephen La Rocque lui répond. |
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8 - 5r / 6 = 3 |
2006-02-15 |
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Scott pose la question : I was trying to help my daughter with the following problem:
8 - 5r / 6 = 3
Can you give me a quick refresher.
Stephen La Rocque lui répond. |
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A normal distribution problem |
2006-02-15 |
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Mary pose la question : In a certain normal distribution, find the mean when the standard deviation is 5 and 5.48% of the area lies to the left of 78. Penny Nom lui répond. |
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Percent gain |
2006-02-14 |
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Bill pose la question : If a stock is bought at $3.50 and sold at $5.80, what percent was the gain? Penny Nom lui répond. |
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How many flat surfaces does a cylinder have? |
2006-02-14 |
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Kimia pose la question : How many flat surfaces does a cylinder have? Stephen La Rocque lui répond. |
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Zhi Wei was born on christmas day in 1983. |
2006-02-14 |
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Clement pose la question : Zhi Wei was born on christmas day in 1983. His father shares the same birthday, but he was born in 1951. In which year will Zhi Wei's age be exactly 1/3 of his father's age? Stephen La Rocque lui répond. |
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Victor's profit |
2006-02-13 |
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Millie pose la question : victor is trying to make money buying and selling cars. he saved up and buys a car for $2500 and then sells it for $4327.he then buys another car using 2/3 of his profit and sells it for twice what he paid for it. how much money did victor make during these transactions? Steve La Rocque lui répond. |
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Golfing with 8 or 12 |
2006-02-13 |
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Carolyn pose la question : I have a couple of questions that my dad asked me and I do not think it can be done in the manner he wants it to come out to.
He is going on a golf trip in June. There are going to be either 8 or 12 players playing 4 rounds of golf.
The questions that he says will not work and I do not know how to figure it out either is
4 Rounds of golf is for sure. 18 hole Rounds each
4 Players to a group
Either 8 or 12 players can every player play with every player in a group at least once during those 4 rounds.
If this can be done can you give me the combinations for both 8 and 12 , so I can help out my dad. Along with how you you figure this out. Penny Nom lui répond. |
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A concrete slab |
2006-02-13 |
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Cheryl pose la question : A concrete area that will be used for picnic benches will measure 20 ft on each side. The concrete slab will be 8 inches deep. How many cubic feet of concrete will be needed to construct the patio? Penny Nom lui répond. |
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Related rates and an oil spill |
2006-02-12 |
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Brandon pose la question :
An Oil Tanker Spills 100,000 cubic meters of oil, which forms a slick that spreads on the water surface in a shape best modeled by a circular disc is increasing at a rate of 3m/min (it doesn't state what is increasing at 3m/min, so I'm assuming Radius until I can ask my teacher.) At t=T, the area of the "circular" slick reaches 100pi Sq. meters.
A) how fast is the area of the slick increasing at t=T
B)How fast is the thickness of the slick decreasing at t=T
C)Find the rate of change of the area of the slick with respect to the thickness at t=T.
Penny Nom lui répond. |
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the size of a lot is 300 sqm, what is the square feet conversion? |
2006-02-11 |
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JC pose la question : the size of a lot is 300 sqm, what is the square feet conversion? Penny Nom lui répond. |
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X^2 + 4X + 6 is a factor of X^4 + rX^2 + s |
2006-02-11 |
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Katie pose la question : If X2 + 4X + 6 is a factor of X4 + rX2 + s, then find the value of r+s? Steve La Rocque and Penny Nom lui répond. |
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A lampshade shape |
2006-02-11 |
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Rose pose la question : Is there a solid shaped like a lampshade? Or do you just call it the bottom portion of a cone? Penny Nom lui répond. |
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Is there a solid shape with 5 faces, 8 edges, and 4 vertices? |
2006-02-11 |
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Annie pose la question : Is there a solid shape with 5 faces, 8 edges, and 4 vertices? Penny Nom lui répond. |
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Working with percentages |
2006-02-10 |
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Mark pose la question :
Hi, i have problem...i am trying to average a group of numbers....when i try to average the average...its gives a different results:
A |
b |
c |
d = A/(b-c) |
1169 |
1173 |
1 |
100% |
534 |
540 |
0 |
99% |
358 |
359 |
0 |
100% |
172 |
174 |
0 |
99% |
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. |
2375 |
3422 |
24 |
70% |
1976 |
3677 |
42 |
54% |
1431 |
3660 |
53 |
40% |
187 |
3433 |
57 |
6% |
761 |
3142 |
39 |
25% |
2080 |
2109 |
7 |
99% |
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38280 |
49121 |
266 |
78.35% |
When I try to average column D - it yields to 86.73% and not 78.35?
Please help me
Penny Nom lui répond. |
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