# Posts by phil

Total # Posts: 303

Math
The transformation T:R^2--?R^2 is defined by T(1,0)=(2,-5) and T(-3,2)=(1,4). Find the natural matrix of the linear transformation T and find T(x,y).

Mechanical Engineering
The equation for flow in a circular pipe for a special kind of fluid, called a "power-law" fluid is given by v=(delP/2mL)^1/n * (n/n+1)*[R^(n+1/n) - r^(n+1/n)] where m and n are constants of the fluid, and delP/L is the change in pressure per unit length and R is the...

History
How did the geographic location of Philadelphia affect the city's development? Because of its location on rivers, the city built bridges and used ferries to allow workers to access the city. Because of proximity to water, streets had to be properly elevated to avoid ...

Physics
okay for a) I got the answer as 11.67 seconds and did v=d/t and for b) i found that wavelength= 6km. Im confused how the 100 m deep affects the equation for c and d. The 2011 Japan tsunami was triggered by an earthquake 70 km offshore. The earthquake travels through the earth ...

Physics
One more please, I cant figure out the equations. Boats generally have a hard time traveling faster than their hull speed, which is thespeed of a water wave that has the same wavelength as the boat length? (a) What is the hull speed for a 5 meter canoe in deep water? (b) What ...

Physics
You and your friend are talking on a string telephone that is 14 m long. Each of you pulls on the string with about 9 N of force, meaning that the string tension is 9 N. The string has a mass density of 1.2 g/m. How long does it take for your voice to reach your friend through...

Physics
A pipe organ is an aerophone with open ended tubes, with esssentially the same physics as the flute. (a) for normal room temperature, where the speed of sound is about 340 m/s how long is the pipe for the A440 note. (b) Suppose someone wanted to install an outdoor pipe organ ...

Physics
You are sitting on a train that is about to drive into a tunnel that is at the base of a large cliff. Just before entering the tunnel, the train blows its whistle, which has a frequency of 600 Hz. (a) What frequency do you hear from the whistle directly? (b) What frequency ...

At a local baseball game, the concession stand has two different meal choices. you can get 3 hotdogs and 5 drinks for \$25.00 or you can get 6 hotdogs and 4 drinks for \$29.00. If the price of hotdogs and drinks is the same for each meal, find how much it cost for an individual ...

Physics
A modern computer central processing unit chip (CPU) runs with a clock speed of 2.7 GHz. It can execute one operation in each of these clock cycles. (a) how many seconds long is one clock cycle? (b) Electrical signals travel at the speed of light How far can an electrical ...

science
What property must a substance have if you want to use the substance to make aqueous solution

Physics
up

Physics
Its B Duhhhhh easy

Maths
The angles of elevation of the highest point of a building from two points S and T are 60 degree and 30 degree respectively,T is vertically above S and ST=10m.Calculate the height of the building above the level of S

Chemistry
.005

Math
From a point P on the ground which is 100m from the foot of a church tower, the angle if elevation of the top of the tower is 50 degrees calculate the height of the tower...

Physics
How do you calculate tension

Math-Calc
Suppose that f(x)=6x(3−2x)3. f(x)=6x(3−2x)3. Find an equation for the tangent line to the graph of ff at x=1x=1.

physics
Rawr XD

L.A.
thanks!

Physics
A car drove 17m/s [N] for 10 seconds, and then speeds up to 25m/s [S] for 7.4 seconds. What is the average speed of the car?

Geometry
If a pie was cut into four equal pieces, adjacent angles would add up to 180 degrees, meaning they are supplementary angles.

life orientation
physical, social and economic consequences of this crime to the offender. how did this corruption and fraud impact negetively in the country, for example, service delivery, tax, expense of trial

Precalculus
The graph of the parametric equations x=cos(t), y=sin(t) meets the graph of the parametric equations x=2+4cos(s), y=3+4sin(s), at two points. Find the slope of the line between these two points.

Chemistry
How do you prepare one liter of phosphate buffer 0.01 M at pH 12.0 from 85% phosphoric acid (density 1.69g/ml) and NaOH 1.0 M

life orientation
describe a recent corruption and fraud case in the country making headlines in the media: who the role players extent to which lead to the other crimes, role played by the media and that the states to deal with this crime. how they fraud and corruption affected offenders career

life oriantation
Critically discuss six ways in which the human rights ...

life orientation
Critically discuss six ways in which the human rights ...

math
simple interest per month on \$210,000.00 loan at 1/4% is how much?

SQL PROGRAMMING INFORMATION SYSTEMS
In the following SQL query why do they have an independent letter then period then the table name? I seemed to have missed something in the reading and cannot find it for the life of me SELECT D.DNAME, E.ENAME FROM DEPT D LEFT OUTER JOIN EMP E ON D.DEPTNO = E.DEPTNO ORDER BY D...

Physics
An object falls from rest. While falling it changes its speed by 10 meters per second every second. Calculate how far it has fallen, in meters, after falling for 4 seconds. However, do not put the units in the box below.

Physics
A stone is dropped from the top of a cliff and hits the round below with a speed of 50m/s. Assume that the acceleration due to gravity is 10m/s/s. Find it's mean speed, in m/s, during the fall. Do not include units when typing your answer into the box. Using the answer you...

Physics
A car is initially travelling at 30m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on. How far does the car travel while the brakes are ...

physics
The conversion is 1:6 180N/6=30N on the moon

Physics
Two blocks with masses m1 = 24.3 kg and m2 = 66.9 kg, shown in the figure, are free to move. The coefficient of static friction between the blocks is 0.34 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against m2

physics
5.34m/s^2

stats
it will still be 50% because you have 1 favorable option out of 2. Past results wont affect the future outcome of this event.

statics
5N 30degrees and 10N 45 degrees 10N at 3rd quadrant. find the direction of resultant force.(in degrees) a.)2.74 b.)-4.57 c.)-2.74 d.)5.33 e.)4.57

chemistry
Unfortunately, there is often more than one way to answer a textbook example. In class, it's one way (the quickest way), and in the textbook, it's another. The "quick" way is fine for tests and exams... but it is useful to me that I learn alternate methods as...

chemistry
Okay, I just figured out the answer and where my confusion came from. Correct me if I am wrong. x/0.104+0.950x = 4.27/7.98 7.98x = 0.44408+4.0565x 7.98x-4.0565x = 0.44408 3.9235x = 0.44408 x = 0.44408/3.9235 x = 0.1131846566

chemistry
Standard Addition Question: Serum containing Na+ gave a signal of 4.27 mV in an atomic emission analysis. Then 5.00 mL of 2.08 M NaCl were added to 95.0 mL of serum. This spiked serum gave a signal of 7.98 mV. Find the original concentration of Na+ in the serum. I can't ...

Area
How many flowers can you plant in an area 19 square metres if each flower needs 0.04 square metres of space

Algebra problem
A cyclist travels at an average speed of 12km/h. At this rate how far will he travel in 9h What's the equation for this?

English
Can you make me a sonnet. 14 lines . 10 syllables. any topic will do.

Computer
Input Process Output or IPO with Flowchart Question: A reel of electric wire 150 metres long is cut into two pieces.One is 40 metres shorter than twice the length of the other.How long is each piece. Please answer with flowchart.Thanks and god bless.

Math
A reel of electric wire 150 metres long cut into two pieces. One is 40 metres shorter than twice the length of the other. How long is each piece.

Math
At an electronics store, the number of 37-inch HGTVs that is expected to be sold in a month is double that of 58-inch HGTVs and 50-inch HGTVs combined. Sales of 58-inch and 50-inch HGTVs are expected to be equal. 58-inch HD-TVs sell for \$4800 50-inch HD-TVs sell for \$2000 37-...

Algebra
The Jones family bought a new pet rabbit. They want to build an enclosure outside . They have 30ft of lumber. Find the length and width of the enclosure if the length is to be 4ft longer than twice the width.

Algebra
The number of 37-inch HDTV's that is expected to be sold in a month is double that of 58-inch HDTV's and 50-inch HDTV's combined.sales of 58-inch HDTV's are expected to be equal. 58-inch HD-TV's sell for \$4,800, 50-inch HD-TVs sell for \$2000, and 37-inch ...

Algebra
Oil that costs \$22.50/barrel is mixed with oil that costs\$35.00/barrel. How many barrels of each oil should be included in 1250 barrels of mixture that sells for \$27.50/barrel?

Algebra
A student has 70%, 80%,79%,and 69% on the first 5 tests . There is one test left and he wants to get at least an 80% in the course. is it possible ? Explain.

algebra
Deb is slicing up a cake for three people. The cake is 45cm long and the second piece is 10cm longer than the first, and the third piece is 5 cm less than double the first . How big is each slice?

sciences

Chemistry
How much milk at 10.00°C needs to be added to a small 150.0 ml cup of coffee at 95.00 °C to drop the temperature to 90.00°C? Assume coffee and milk have the same specific heat capacity as water: 4.186 J/g °C or 1 cal/ g °C, and they also have the same ...

statistics
For the first one, 13% are Civil Engineers, but where do I go from there?

statistics
In a class of 100 students, 30 are computer science majors, 49 are mechaincal engineering majors, 13 are civil engineers and the rest are general engineering majors. Assume students only have one major. If a student is chosen at random what is the probability they are: a civil...

Art
C B D IS CORRECT

MATH EMERGENCY
The demand function for a certain brand of CD is given by p = −0.01x^2 − 0.2x + 12 where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. The supply function is given by p = 0.01x^2 + 0.7x + 1 where p is the ...

math
Sue has a total of \$4000 to invest in two accounts. one account earns 2% simple interest and the other earns 5% simple interest. How much should be invested in both accounts to earn exactly \$155 at the end of the year?

algebra
A plane takes 3 hours to travel 1500 miles with the wind. it can travel only 1380 miles against the wind in the same amount of time. Find the speed of the wind and the speed of the plane in still air.

math
A 70% acid solution is to be mixed with a 40% solution. How many gallons of each solutions are needed?

Physics
Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal, what is the ...

statistics
you were wrong, its B

Chemistry URGENT
Question number 1 is simply asking what the weight of the second heating needs to be in order for the compound to be "dehydrated." The two weights need to be within .05g in order for the sample to be dehydrated. In this case: 4.8702g(initial mass)- 3.0662(after first...

Piano movers hoist a 200 kg piano 10 m high in 30 s using a rope and simple pulley. What is their power output? (Points : 1) 70 W 700 W 7,000 W 6 × 10^5 W

physics
The top floor of a building is 40m m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

pyhsics
The top floor of a building is 40m m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

physics
Calculate the average force per nail when Sarah (following figure), who weighs 130 pounds, lies on a bed of nails and is supported by 600 nails. (Figure 1) Express your answer using two significant figures.

physics
A dike in Holland springs a leak through a hole of area 0.60cm 2 cm^2 at a depth of 1.4m m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? Express your answer to two significant figures and include the appropriate units.

physics
Find its density. Express your answer to two significant figures and include the appropriate units How does this compare with the density of water? Express your answer using two significant figures.

physics
In the sketch, the small hydraulic piston has a diameter of 2.5cm cm . The large piston has a diameter of 6.4cm cm . For each newton of force applied to the small piston, how many newtons of force are exerted by the large piston? Express your answer using two significant ...

physics
205.8 J/s

Statistics
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.

accounting
Heww Inc., issued a \$50,000, 10 year bond with a stated interest rate of 6%. Assume interest payments are made semi-annually. What is the selling price of the bond if the market rate of interest is 5%? (Round to the nearest dollar.)

I just need help with rounding for making sure I round my answer correctly. Can you round this 1.299678785 to the nearest hundredth Thanks :)

Physics 112
Moving a charge from point A, where the potential is 370V , to point B, where the potential is 190V , takes 4.1×10−4J of work. Part A What is the value of the charge?

Physics
Yep! You got it!

algebra
using formula d(h)=8e^-0.4h to determine the milligrams d of a certain drug in bloodstream h hours after given.how many milligrams will be present after 6 hours?

ALGEBRA
7300 @ 7% COMPOUNDED SEMIANNUALLY FOR 3 YRS

physics
solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle è = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is ì = 0.64. What is ...

Algebra
A rectangle is 5 times longer then it is wide. If perimeter of the rectangle is 222m. What are its dimensions

Physics
IDK THIS IS REALLY HARDD

math
Phil invested \$150 at an annual rate of 4% compounded continuously, what amout to the nearest cent will be in his account after 2 years? Graph the amount in his account over the first 8 years.

math
A cable company charges \$40 plus \$12 for each cable jack. If x is the number of jacks installed, the linear equation is C=12x+40. graph the total

US HISTORY
It was a stock market crash

Physics
A small object of mass 2.60 g and charge -17 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?

Physics
Calculate the net charge on a substance consisting of a combination of 7.5 multiplied by 1013 protons and 3.5 multiplied by 1013 electrons. Answer in units of C

Math
I need help solving this equation using the Factoring Completely method. X⁴-x³

Physics
A guitar string is 90cm long and has a mass of 3.8g . The distance from the bridge to the support post is L=62cm , and the string is under a tension of 540N . What are the frequencies of the fundamental and first two overtones?

Physics
Two spheres of charge q1 and q2 that are equal in magnitude (i.e. |q1| = |q2|) are attached by a spring with a constant k = 1440kg/s2 and a rest length of x0 = 83.0cm. We take negative values of Äx for compression and positive Äx values for expansion. Knowing that q1...

Geometry
find the area of a triangle whose base(b) is 8 inches and whose height (h) is 12 inches

Geometry
If the length(L) of a rectangle is 15 inches and the Width(W) is =2 in. Then what is the area?

Geometry
If the base(b) of a triangle is 9 inches and the height(h)is =12 in. Then what is the area?

Algebra
Which is the correct answer to the following: Simplfy: 2 + 3 . 10 Devided by 5 . 3 - 9 A)"5 B) 21 C)"60 D) 11

American Government
True or False: The U.S. "Superior" Court is the Nation's most powerful court? (is Superior and Supreme one in the same?)

geometry
What is the area of a triangle if the base is 12 inches and the height is 18 inches?

Algebra
Simplify: 2 + 3 . 10 Devided by 5 . 3 - 9 (Thanks and Happy New Year!)

Algebra
What is the evaluation of: a - 13 when a = 33. Thanks & Happy New Year :)

Algebra
What is the value of 3a when a = `4. (Thank you in advance & Happy New Year!)

Algebra
What is the value of 20x when x = 10. (Thank you in advance and Happy New Year! :)

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