Tutors Answer Your Questions about Proportions (FREE)
Question 1017546: 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 ikleyn(52786)   |
Question 1019858: Hello,
I am having trouble solving this problem:
"If 1487 adults and 912 children attended the concert, what was the approximate ratio of adults to children?"
Also, if you don't mind, could you show me the formula?
Thank you.
Click here to see answer by Alan3354(69443)  |
Question 1019908: Hi! I am a 7th grade pre-algebra student and I was trying to complete a homework packet with this title: Percent Proportion Word Problems. The directions are: Solve each word problem. Show each proportion and label each answer. The question I need help on is as follows:
The movie theater has 250 seats. 225 seats were sold for the current showing. Write a proportion and solve for the percent of seats that are empty.
I tried out this problem and set up my proportion like this: 225 x
--- = ---
250 100
when I solved for x using the cross multiply method, I got: 22,500 = 250x and then I divided by 250 so: 22,500 = 250x
------ ----
250 250
My answer was x = 90%. I thought this was a good answer but when I looked back, my answer didn't seem to make sense. I would GREATLY appreciate it if someone could help me out and explain to me what I did wrong! So for any replies I get: thanks in advance!!!
P.S. I'm sorry my proportions look a little weird on the computer but it's supposed to be 225 over 250 equals x over 100. For the division it was supposed to be 22,500 over/ divide by 250 equals 250x over/divide by 250. Once again, I'm really sorry if this caused any confusion.
Click here to see answer by stanbon(75887) |
Question 1019908: Hi! I am a 7th grade pre-algebra student and I was trying to complete a homework packet with this title: Percent Proportion Word Problems. The directions are: Solve each word problem. Show each proportion and label each answer. The question I need help on is as follows:
The movie theater has 250 seats. 225 seats were sold for the current showing. Write a proportion and solve for the percent of seats that are empty.
I tried out this problem and set up my proportion like this: 225 x
--- = ---
250 100
when I solved for x using the cross multiply method, I got: 22,500 = 250x and then I divided by 250 so: 22,500 = 250x
------ ----
250 250
My answer was x = 90%. I thought this was a good answer but when I looked back, my answer didn't seem to make sense. I would GREATLY appreciate it if someone could help me out and explain to me what I did wrong! So for any replies I get: thanks in advance!!!
P.S. I'm sorry my proportions look a little weird on the computer but it's supposed to be 225 over 250 equals x over 100. For the division it was supposed to be 22,500 over/ divide by 250 equals 250x over/divide by 250. Once again, I'm really sorry if this caused any confusion.
Click here to see answer by LinnW(1048)  |
Question 1021109: Coach shaw is buying baseball equipment for his team. He gets a reduced rate if he buys 8 baseballs for every 3 batting helmets. the reduced rate is $2.25 per baseball and $22.5 per helmet. the sales tax is 6%. Coach Shaw has $400 in his budget to buy baseballs and helmets. what is the greatest number of baseballs and helmets he can buy at the reduced rate if the ratio of baseballs to helmets is 8:3?
Click here to see answer by Theo(13342)  |
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