Tutors Answer Your Questions about Proportions (FREE)
Question 1022390: http://prntscr.com/a8z5eq
So, I figured out 24 meters for a using the altitude is the mean of the segments of a triangle theorem. However, I can't figure out what to do for b. My teacher does NOT want us to use the Pythagorean theorem for this. In fact, we haven't even learned it yet (it comes later in the course). The only things we've learned helping us up to answer this problem is geometric mean, the theorem I just mentioned, angle-bisector-theorem, and the theorem that say the altitude of the hypotenuse of a right triangle separates the hypotenuse so that the length of each leg of the triangle is the geometric mean of the length of the hypotenuse and and the length of the segment of the hypotenuse adjacent to the leg. She wants us to work off of all or a few of those theorems, but I just can't just to figure it out.
Click here to see answer by rothauserc(4718)   |
Question 1017351: Hi, I am having trouble working out this question, help would be much appreciated.
An electrically charged particle generates an electric field around it. The strength, E, of the electric field (in NC^-1) is directly proportional to the size of the charge of the particle, Q (in Coulombs, C), and inversely proportional to the square of the distance from it, d in metres.
(i). Set up the proportionality relationship
This is what I think the formula is but not sure if it is correct?
E (NC^-1)= k * (Q/D^2)
And then theirs question (ii)
(ii). Find the constant of proportionality if the electric field strength 3.00 cm from a 3.5 uC charge is 3.5 x 10^7 NC^-1
This is what I've worked out so far not sure if it is correct though?
3.5 * 10^7 = K * Q/(0.03)^2
3.5 * 10^7 = K * Q/(0.09)
Click here to see answer by rothauserc(4718) |
Question 1023112: The power P obtained a windmill is directly proportional to the cube of the wind speed s.
a) Write an equation that expresses this variation.
b) Find the constant of proportionality for a windmill that produces 96 watts of power when the wind is blowing at 20 mi/hr.
c) How much power will this windmill produce if the wind speed increases to 30 mi/hr.
Click here to see answer by josgarithmetic(39616) |
Question 1023112: The power P obtained a windmill is directly proportional to the cube of the wind speed s.
a) Write an equation that expresses this variation.
b) Find the constant of proportionality for a windmill that produces 96 watts of power when the wind is blowing at 20 mi/hr.
c) How much power will this windmill produce if the wind speed increases to 30 mi/hr.
Click here to see answer by god2012(113)  |
Question 1023419: When Kelsey is not on the moving sidewalk, she can walk the length of the sidewalk in 3 minutes. If she stands on the sidewalk as it moves, she can travel the length in 2 minutes. If Kelsey walks on the sidewalk as it moves, how many minutes will it take her to travel the same distance? Assume she always walks at the same speed.
Click here to see answer by josgarithmetic(39616) |
Question 1023797: A normal population has a mean of 19 and a standard deviation of 5.
Compute the z value associated with 25
What proportion of the population is between 19 and 25?
What proportion of the population is less than 17?
Click here to see answer by Fombitz(32388)  |
Question 1024020: Population: The map shows the most populated cities in the United States. If the population of Phoenix is about 24% of the state's population, what is the approximate population of the state? (Round to the nearest tenth of a million.)
Phoenix is 1.37 million
Click here to see answer by Cromlix(4381)  |
Question 1024722: A flower bed is in the shape of a triangle with one side twice the length of the shortest side, and the third side is 19 feet more than the length of the shortest side. Find the dimensions if the perimeter is 159 feet.
A equals= ____ft (shortest sides
B equals= -ft (second side)
C equals= _____ ft (third side)
Click here to see answer by addingup(3677)  |
Question 1024627: Y varies directly to x^2. If x is decreased
by 200%, find the percentage decrease in y.
My solution-- y=kx^2
1. X itself is 100% so if decrease by 200%,
the new x will be x-x-x= -x
2. The new y = k (-x)^2------= kx^2
3. Percent decrease =. Kx^2- kx^2)/ kx^2
Step 3 made me confused if y= 0%
Click here to see answer by Alan3354(69443)  |
Question 1025918: The amount Byron earns is directly proportional to the number of hours he works. If Byron earns $60.80 for 4 hours of work, find the constant of proportionality and write s direct proportion equation.
w/t=60.80/4=15.20/1
w/t=15.20/1
w= 15.20t
Click here to see answer by josgarithmetic(39616) |
Question 1025917: The admissions fee is $8.50 per person. Given the admission fee, C dollars is directly proportional to the number of people,n identify the constant of proportionality and write a direct proportion equation.
c/n=8.50
c=8.50n
Click here to see answer by FrankM(1040)  |
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