Thursday
July 31, 2014

Posts by emily


Total # Posts: 2,300

Physics
The air speed indicator of a plane that took off from Detroit reads 373 km/h and the compass indicates that it is heading due east to Boston. A steady wind is blowing due north at 42.3 km/h. Calculate the speed of the plane with reference to the ground. If the pilot wishes to ...

Physics
For a science fair competition, a group of High School students built a kicker-machine that can launch a golf ball from the origin with a velocity of 12.3 m/s and initial angle of 29.9° with respect to the horizontal. *Where will the golf ball fall back to the ground? *How...

Physics
A golf ball is hit with an initial angle of 54.7o with respect to the horizontal and an initial velocity of 85.1 mph. It lands a distance of 104.3 m away from where it was hit. By how much did the effects of wind resistance, spin, and so forth reduce the range of the golf ball...

math
hey, this is my first time using this site so I'm not sure what I'm doing exactly! So i need a REALLY simple way how to convert fractions into a percent! i be confused!! :(

Photography
Suppose you have three negatives: an over-exposed one, an under exposed one, and a correctly exposed one. Which would require the longest exposure during contact printing?

Math
Lois invests $650 every 6 months at 4.6%/a compounded semi-annually for 25 years. How much interest will she earn after the 25th year?

Math
I did it, im just making sure my answer is right

Math
On July 1, 1996, Anna invested $2000 in an account that earned 6%/a compounded monthly. On July 1, 2001, she moved the total amount to a new account that paid 8%/a compounded quarterly. Determine the balance in her new account on January 1, 2008.

math
On July 1, 1996, Anna invested $2000 in an account that earned 6%/a compounded monthly. On July 1, 2001, she moved the total amount to a new account that paid 8%/a compounded quarterly. Determine the balance in her new account on January 1, 2008.

Math
Cliff has some money he wants to invest for his retirement. He is offered two options: 10%/a simple interest or 5%/a compounded annually. Under what conditions should he choose the first option

Math
Q: Determine the sum of the first seven terms of a geometric series in which the first term is 11 and the seventh term is 704. ^Are there two answers, since the common ratio could be positive or negative?

math
in 5 years art will be twice as old as ben. 5 years ago art was 3 times as old as ben. How old are they?

Math
The revenue for a business is modeled by the function R(x)=-2.8(x-10)^2+15, where x is the number of items sold, in thousands, and R(x) is the revenue in thousands of dollars. Express the number sold in terms of the revenue.

Math
Determine the domain and range of f(x)=-sqrt(x+3) and the equation of the inverse.

Math
Simplfy 7sqrt(3/6)

Pre Calc
A swimming pool can be filled by a vent in 10 hours. When the pool is filled, it can be emptied bya drain pipe in 20 hours. The pool manager mistakenly leaves the drain pipe open while trying tofill the pool. How long will it take to fill the pool?

physics
Find the coefficient of kinetic friction between a 4.3-kg block and the horizontal surface on which it rests if an 80 Newton/meter spring must be stretched by 2.7 cm to pull the block with constant speed. Assume the spring pulls in a direction 13 degree above the horizontal.

Math
40 + 24 = 64

physics
thank you! may God bless you Bob :)

physics
My bad. Find the coefficient of kinetic friction between a 4.3-kg block and the horizontal surface on which it rests if an 80 N/m spring must be stretched by 2.7 cm to pull the block with constant speed. Assume the spring pulls in a direction 13 degree above the horizontal.

physics
Find the coefficient of kinetic friction between a 4.3- block and the horizontal surface on which it rests if an 80 spring must be stretched by 2.7 to pull the block with constant speed. Assume the spring pulls in a direction 13 above the horizontal.

Algebra 2
Complete the square to solve -x^2-7x+6=-2x^2

MATH
Solve for y in the following system of equations: x - y = -1 3x + 5y = 21

Math
if log(x+1) 27=3 find the value of x *(x+1) is the base i know that the answer is 2 but i have no clue how to get that

Statistics
"Buy a Match 6 lottery ticket every day until you win the lottery. (In a Match 6 lottery, a player chooses 6 different numbers from the set {1, 2, 3, ..., 44}. A lottery representative draws 6 different numbers from this set. To win, the player must match all 6 numbers, i...

science
when do plates have the most potential energy

Math
The height of the tide in a given location on a given day is modelled using the sinusoidal function h(t)=5 sin (30(t-5))+7. a) What time is high tide? What time is low tide?

Life Span Development
Someone tells you that she has analyzed your genetic background and environmental experiences and concluded that environment definitely has had little influence on your intelligence. What would you say about this analysis?

math
A grocer get food from three suppliers. They deliver every 5 days, 6 days, and 7 days, respectively. All three came today. When will they all deliver on the same day again?

social studies
why does the 21st century include 2011

marketing
Imagine that you are a mentor to a new employee at a marketing firm. The new employee is having trouble understanding what the term market communication really means.

english
Verbs that form their past and past participle by adding ed , d , or t to the present are called a) regular. b) irregular

English
Read the following sentence. Decide if the verb is used as transitive or intransitive. The sun rose over the mountain. 1)transitive 2)intransitive

Statistics
Ohhh I get it now! Thanks so much!

Statistics
A coin is tossed five times. Find the probability of getting four tails. I realize that getting four tails is the exact same thing as getting only one heads, but how would you figure out this problem using probability rules? Thanks for your time, I appreciate it :]

math
hi i made a typo in my last question can u please show me step by step how to simplify [(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1]

math
[(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1] is right yes please help

math
how do i simplify [(x^3/y^3) -1]/[(x^2+y^2)+(x/y)+1]

Math
The point (-8,3) lies on the terminal arm of angle theta in standard position. Determine the primary trigonometric ratios for angle theta and calculate the value of theta to the nearest degree. Only the sine ratio was positive, and when I used that to calculate the angle, it w...

Math
State the restrictions on the variables for these trigonometric identities. a)(1 + 2 sin x cos x)/ (sin x + cos x) = sin x + cos x b) sin x /(1+ cos x) = csc x - cot x

math
im helping my brother with his homework but i completely forgot how to do this? Solve the system by substitution: y=3x-4 x+5y=-4

General Chemistry
According to the following reaction, how many moles of Fe(OH)2 CAN FORM FROM 175.0 mL of 0.227 M LiOH soultion? Assume that there is an excess of FeCl2 FeCl2(aq)+ 2 LiOH(aq)-(Oh)2(s)+2LiCl(aq) I have no clue how to approach this problem? Could anyone help me? I do not know wer...

Math
Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually Under what conditions should he choose the first option?

Math
Under what conditions should he choose the first option? Explain.

Math
Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually

Physics
How does the index of refraction relate to the speed of light in a substance?

Physics
When an object is immersed in a fluid describe the buoyant force?

Physics
A 1.5kg frog on a string is being dragged along a table with a force of 12N. If string makes a 60 degree angle with the table, and the co efficent for friction is 0.15, what is the accleration of the frog.

chemistry
The boiling point of an aqueous solution is elevated by 0.15 degrees celcius. the change in freezing point of the solution, delta T, is? a.) -6.32 b.) 0.15 c.) -0.15 d.) 0.54 e.) -0.54 I know the answer is d, i just don't understand how to get it! thanks!

calculus
D. Plugging 2 into original fxn gives you y-coordinate. (2,6) Taking the derivative of y=(x^3)-x gives you f'(x)=3x^2-1. Plug in x=2 to find slope. use point slope form to get equation! :)

Math
sin^2 theta + 2 cos theta -1/ (sin^2 theta +3 cos theta-3= cos^2 theta+cos theta/ (-sin^2 theta) Prove the identity.

Biology-Respiratory System
What's the difference between capillaries, pulmonary artery and pulmonary vein?

Math
Prove this identity. State any restrictions on the variables. sin x/(tan x)= cos x

Physics
A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation P...

Physics
A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation P...

Math
Determine whether each general term defines a geometric sequence. Explain. a) f(n)= 2/(3n+1) b) f(n)= 11/(13^n)

2nd grade math
measure the perimeter to the nearest 1/2cm.

statistics
An Urn contains 7 red and 3 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white?

8th grade
what i think the legal age 4 drinking should be

Algebra 2
Need help on the #13-20. 13. What is the quotient of d − 2 ) d 4 − 6d 3 + d + 17 __________________ ? A. d 3 − 4d 2 − 8d − 15 R −13 B. d 3 − 8d 2 + 16d − 31 R 79 C. d 3 − 4d 2 + 9d + 35 D. d 3 − 8d 2 + 17d − 17 ...

chemistry
if you combust 30kg of octane (about the amount in one tank for a small car), how many kilograms of CO2 will you emit?

chem 2
What concentration of NaF is required in order to convert a 0.15M HF solution to a buffer with a pH of 5.50?

Math
Given angle theta is bigger than 0 and smaller than 360, determine two possible values of theta where each ration would be true. a) cos theta= 0.6951 b)sin theta= -0.7571

Math
Use the related acute angle to state an equivalent expression: a) tan 110 degrees b)sin 350 degrees

Biology
Explain your liver's role in changing your blood sugar level

chemistry
How much energy (in kilojoules) is needed to heat 5.45g of ice from -12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water

Biology
What is the lumen of the human digestive system?

Physics
how many sig figs do you use for estimated absolute uncertainties?

Math
Is RESP a form of annuity?

physics
A record player is spinning at 32 rpm when the motor is switched off. After 6.8 seconds the angular speed has decreased to 20 rpm. Calculate the frictional torque if the record player can be treated as a solid wheel of mass 2.4 kg and radius 15 cm. A) 476.47059 Nm B) 0.00499 N...

need physics help
2.1=0(.6)+.5(a)(.6^2) you can get drop the vit since vi=0. that will leave you with 2.1=.5a.6^2 multiply (.5)6^2 then you can divide 2.1 with the answer you got.

physics help please
The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 6.0 rev/s in 12.0 s. At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 11.0 s. Through how many revo...

Math
Thanks!

Math
The hypotenuse of,c of right triangle ABC is 7.0 m long. A trigonometric ratio for angle A is given for four different triangles. Which one of these triangles has the greatest area? Justify your decision. a)sec A=1.7105 b)cos A=0.7512 c) csc A=2.2703 d)sin A= 0.1515

Math
In simple annuities, why is the amount of payment for the first deposit R(1+i)^n-1? Shouldn't it be n?

8th grade
how much water vapor is in 15 C

math
in addition to x=0, x=7 2[2x-7]+11=25 2[2x-7]=14 [2x-7]=7 2x=14 x=7 Check 2[2(7)-7]+11=25 2[7]+11=25 14+11=25 25=25 :D

math
You want to get the absolute value portion of the equation alone first. They you can find what x would equal if it were (2x-7) = blah and if -(2x-7) = blah.

Math
Nevermind, I was able to do it with synthetic division.

Math
How would I find the zeros of the function x^3 -7x +6 ? I know how to do with a x^2 term but, I'm confused as to how to do it when there isn't an x^2.

Math
In a geometric series, t1=12 and S3=372. What is the greatest possible value for t5? Justify your answer.

Math
cent, cent, scent equals 35128; how do you solve it?

Math
The 10th term of an arithmetic series is 34, and the sum of the first 20 terms is 710. Determine the 25th term.

Science
A gas filled balloon having a volume of 3.0 L at 1.1 atmosphere of pressure and a temperature of 22 C is allowed to rise into the stratosphere where the temperature and pressure are: - 28 C (note the negative sign) and 0.002 atmospheres , respectively. What is the approximate ...

Calculus
The volume of a cone of a radius r and height h is given by V=(3.14/3)(r^2)(h). If the radius and the height both increase at a constant rate of .5 cm per second, at what rate, in cubic cm per second, is the volume increasing when the height is 9cm and the radius is 6cm.

Science
Is sugar a covalent or ionic compound?

Math
why do you let n=1, 2 and 3?

Math
How do you get the general term for a sequence that has increasing common differences? For example: 1,2,4,7,11

Math
Thanks!

Math
Determine the 10th term of the sequence 3, 10, 28, 72, 176... State the general term.

social studies
guarentee

social studies
you should always read the ______ before you a buy a product... answer is 9 letters long third letter is an a...

social studies
if you own a factory the factory and any equipment in it are part of your... answer is 7 letters fourth letter is an i... i have been through everything in my study guide and cannot find the answer for this one...

1
omg i absolutely love you bobpursley! thankss for the help as well. =]

Accounting
I have a problem with management accounting However, I have trouble posting the question here Is it possible that i can send it to someone for their assistance

Math(geometric sequences)
sorry i meant 4

Math(geometric sequences)
sorry i subbed 10 into it, and it was wrong.

Math(geometric sequences)
A certain antibiotic reduces the number of bacteria in your body by 10% each does. a)If four does of the antibiotic are taken, what percent of the original bacterial population is left? I think the formula is supposed to be tn=100(9/10)^-1, but when i substituted 1 into it, th...

5th grade science/ colloids
what are some examples of colloids? like a mixture,compound or sometin.... im looking for something like a colloid is water and oil mixed together and so on. thx :)

chemistry
Light with a wavelength of 405 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.49 105 m/s, what energy was expended in removing the electron from the metal? Express the answer in joules (per electron) and in kilojoules per m...

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