Posts by z

Total # Posts: 131

Physics 2017
I have a coil of copper wire. I want to know the length of the wire in the coil. I do not wish to unwind the coil and measure the length directly. I find from a table of densities that the density of copper is 8.89x10^3kg/m^3. Explain how I could find the length of wire.

It depends on the object, but generally the bottom

Physics
A hydraulic hoist has a ram of 30 cm diameter and a plunger of 1 cm diameter. If 70 N effort is applied to the plunger and the efficiency is 80%, find the maximum load it can raise.

Maths B
The running costs of a particular factory consist of two components – a constant charge per week for rent of premises and a variable cost for labour which depends on the number of staff working in the factory in that particular week. The total weekly running costs are \$20...

math
thanks!

math
Write the inequality that represents the solution set for ?15/9 y <11/13 .

math
thank you!

math
So far this year Nick has scored a 75, 81, 88 and 92 on four of his math tests. Each test is worth a maximum of 100 points. To earn a B this year, Nick needs a test average of 80 or better. Write the inequality that represents this scenario. Let t equal Nick's grade on the...

math
ok i think i wrote it wrong the y is a seperate variable its not suppose to be with the 9

math
i put that in and it said it was wrong

math

Math
30x

Math
expand brackets or simplify for both sides then combine values for x (or y) and the integers. if you end up with 0=0 answer is C if you end up with 0=N answer is B otherwise answer is A. eg qu 2 gives 3y-9=3y-9 which gives 0=0 and is obviously true for any y so answer here ...

Physics
Two point sources emit sound waves of 1 m wavelength. The sources are pointed at each other. The sources, 2 m apart, emit waves which are in phase with each other at the instant of emission. a) Where, along the line between the sources are the waves out of phase with each ...

Math
6/5 = 51/2 =122.4 sec

Math

Math
8 8*2 = 16, square root of 16 is 4. 1/2 of 8 is also 4, therefore the answer is 8.

math
Let number of children's tickets be ----X Let number of adults tickets be 450-X 2x+5(450-x)=1800 X= 183( round it up to nearest whole number) 450-183=267 James sold 267 adults ticket.

They are Correct.

Math
Yes

Math
When you divide by a fraction don't forget to flip it

Math
3*7.8 + 5*9.2 =?

Math hard
What are you trying to solve for?

Algebra 2
Lol

Algebra 2
Write it out helps. Let the 3 numbers be A,B,C B = A + C + 2 2C = A + C 42 = A + B + C

Set each one equal to zero and solve for X -2x = 0 x^-16 = 0 x-3 = 0

math
It helps if you draw it out.Anyways Let H be the height of the pole. Tan35=H/21.3 Solve for H

math
Is the number of worker the only variables they give you?

math
Yes. And it's because square root of X can be a negative number which would make it an imaginary number.

Pre Algebra
Arnold multiplied instead of dividing by 3

Math: Help MEEE!!!!!!
n ≥ –16 when you divide by a negative you have to flip the sign

Algebra2
(c) obviously the vertex form (d) standard form, so you have the needed a,b,c coefficients.

math
P = Po(1+r)^n. Po = \$600. r = 4%/100% = 0.04 = APR expressed as a decimal. n = 1Comp./yr * 6yrs = 6 Compounding periods. Plug the above values in the given Eq and get: P = \$759.19

Math
15/25=0.6 Each ticket cost \$0.6 if you buy a roll of tickets.

math
Find the values of the trigonometric functions of t from the given information. tan(t) =1/9 terminal point of t is in Quadrant III sin(t)= cos(t)= csc(t)= sec(t)= cot(t)=

Physics
ÔÚ

Math
This task is about choosing a new washing machine. Your washing machine is broken. You need a new one. The new washing machine must hold at least as much as the old one and spin at least as fast as the old one. You used your old washing machine three times a week. Details of ...

Math
Thanks for the response Steve, but this doesn't quite clarify things for me. The step I keep getting lost on is this one: "x^2+y^2-2x-y = 0 2y+x-2 = 0" How did you get to this point? What happened to the 2yi + xi?

Math
Hey! So, I've been working on this problem for awhile but I'm currently a bit dumbfounded on how to solve it. I think this question has been answered before but I still don't quite understand how it works or how to explain it. The problem is as follows: |z|^2 -2(...

algebra
One adult ticket and seven children's tickets cost \$62. Two adult tickets and eight children's tickets cost \$79. How much does one adult ticket cost? How much does one children's ticket cost?

Statistics
0.6692

Comm Tech
1 B 2 D 3 B 4 C 5 A I GOT A 100

Algebra
the independent variable is the one you change and is usually on the right side. the dependent is the one that changes because of the function and is usually by itself on the left side. but not always! if you have x and y, x is most likely the independent and y is the ...

Math (Trig)
A triangle ABC has a trisected angle A. The angle trisectors divide side a (opposite angle A) into three segments which are BD, DE, and DC. The lengths are 2, 3, and 6, respectively. What are the lengths of the other sides?

Math
sometimes its easier if you just look at the decimal part as a number. example: 480, 4_1, 463. the missing digit cant be 8 or more because 481 isnt less than 480, and and cant be 6 or less because 460 isnt greater 463. so the digit is seven

Chemistry
Suppose water contained some harmful volatile substance. How could you easily remove the volatile substance in a laboratory?

Chem
What is the concentration of a solution made by diluting 85 mL of 6.0 mg/L free chlorine to a final volume of 750 mL?

Science

Probability & Statistics
To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed. The FDA tests on this cigarette yielded mean nicotine content ...

4!/9!

Maths
.124

Physics
A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions...

Where can I find detailed info on all the lawsuits that Microsoft have encountered?

Chemistry
For a particular isomer of C8H18, the following reaction produces 5099.5 kJ of heat per mole of C8H18(g) consumed, under standard conditions. What is the standard enthalpy of formation of this isomer of C8H18(g)?

English
To indicate a thought (For example: I'm hungry), do you put quotation marks around the thought as you would do if the thought were spoken out loud, or do you put the thought in italics?

statistics
yes

1.B 2.B 3.A 4.D These are the right answers.

math
34

Science
what is the definition of nutrient?

Chemistry
do you have to convert the 9grams to liters in order to answer the first question for the protein amount? i

ecology
I have a Data Analysis Lab that has a graph attached to it. It talks about how temperature affects the growth rates of the two species'. It says that researchers studied the effect and they hypothesized that increasing temperature would increase the growth rate. However, ...

parellel
Lots of my friends think that Prince's music is old, but I think it's not only excellent or but also an innovation.

physics
A ball is thrown downwards from a roof at 24.0m/s. What is the velocity of the ball after 4s?

physics
two cars weighing 1500 kg are made to collide with a wall.the initial and final velocities are 15 m/s and 2.6 m/s.if the collision last for 0.15 seconds,then find impulsive force exerted on the car

math
. Which ordered pair could you remove from the relation {(–2, –1), (–1, 1), (–1, 0), (0, 1), (1, 0)} so that it becomes a function?

computer science
What does it mean when there is a high prior probability in terms of Baynesian statistics?

Science
Paper is abiotic!

chemistry
Calculate the pH of a 195 mL solution containing 7.50g of ethylamine (CH3CH2NH2) and 7.50g of ethylammonium bromide (CH3CH2NH3+ Br-). The Kb of ethylamine is 4.7 x 10-4

chemistry
how many grams of magnesium are required to react with 2.0 moles of hydrochloric acid?

calculus 2
yes

math
Minding their manors

Chemistry
titration is when you eat the water, hydration is when you drink the water. U are the welcome.

Chemistry
jislkm

Chemistry
By the way, The answer is D. :0)

Chemistry
It's that simple? Thank you. I made it harder than it was.

Chemistry
When solutions of KCl and Pb(NO3)2 are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs? a. KCl(aq) + Pb(NO3)2 (aq) ¨ KNO3 (aq) + PbCl2 (s) b. KNO3 (aq) + PbCl2 (s) ¨ KCl(aq) + Pb(...

Math
when testing for a fever, what is the true positive rate for a thermometer that always reads 105 F? What is the false positive rate? **Note: the definition of fever is that the patients temperature exceeds 100 F**

Computer Science
when testing for a fever, what is the true positive rate for a thermometer that always reads 105 F? What is the false positive rate? **Note: the definition of fever is that the patients temperature exceeds 100 F**

The sum of two consecutive numbers is 37. What are they?

math
right answers 4.? 5. A 6. B

PHYICAL
What is equivalent between points a and b when R=3 R R ----\/\/\/----\/\/\/---- a /\/\/\-----b \/\/\/\/-----

PHYICAL
What is equivalent between points a and b when R=3 R R ----\/\/\//---\/\/\/\/----| | | | | | | a | | R | b ----| --/\/\/\/\--------- | | | R | |----------\/\/\/\/-------|

english
Hi, I Proofread for wording errors and grammar, but I need help to see if my grammar is proper now. I personally respect every religion, and I love reading holy books. Holy books inspire many people. Holy books taught me many morals and stories on our everyday life, which ...

chemistry
An unknown sample with a molecular mass of 180.0g is analyzed to yield 40% C, 6.7% H, and 53.3% O. What is the empirical formula and the molecular formula of this compound?

Related rates
hii... am in the solution with the V = (1/3)π (h^2/4)(h) still have h in 2/4?? isn't the derivative of r = h/2 is just 2/4??

Physics
zz

statistics
Find a z value to the right of the mean so that 74.5% of the distribution lies to the left of it.

English
I need the answerrr uhg I'm stuck

math
chicken butt

math
you are standing 15 feet from a statue the angle of the elevation from eye level to the top of the statue is 27 degrees, and the angle of depression to the base of the statue is 18 degrees. How tall is the statue? show work

How do you factorise?

algebra
8^(x+5)=32^(x-9)

algebra
5|2x-5|=15

Calculus (pleas help!!!)
Consider the parameterization of the unit circle given by x = cos(ln(2t)), y = sin(ln(2t)) for t in (0,∞). De- scribe in words and sketch how the circle is traced out, and use this to answer the following questions. SOLUTION Let h(t) = ln(2t). Then h′(t) = 1 . The ...

Algebra II
((x-1)/3x+15))-((x+3)/(5x+25)) HOW TO SIMPLIFY THAT???

Algebra II
((x-1)/3x+15))-((x+3)/(5x+25)) HOW TO SIMPLIFY THAT???

Algebra II
((x-1)/3x+15))-((x+3)/(5x+25)) HOW TO SIMPLIFY THAT???

math
laura has a roll of ribbon there are 29 yards of ribbon on the roll what equation can laura use to find the number of inches of ribbon on the roll

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