# Posts by Tony

Total # Posts: 1,001

Aerodynamics
Please if you could help with this... and explain very carefully I'll be very thankful. The dragonfly has a wing chord of 0.01 m, and can fly at 10 m/s. Assume roughly sea level viscosity ν=1.45×10−5m2/s. Determine the momentum thickness θ...

Physics
Two identical pucks are set on a collision course on an air table. After the collision, puck A has a final velocity of 5.00cm/s at an angle of 28 degrees from the vertical and puck B has a final velocity of 4.00cm/s at an angle of 32 degrees from the vertical. Determine the ...

Math
43.9600

cal
Using the Second Partials Test Find the relative extrema of f(x,y)=-x^(3)+4xy-2y^(2)+1

cal
Using a Lagrange Multiplier with One Constraint. Find the maximum value of f(x,y)=4xy, where x>0 and y>0, subject to the constraint (x^(2)/3^(2)+(y^(2)/4^(2)=1.

phys
A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is

phys
A 12-kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30 degree below the horizontal. If the coefficient of static friction is 0.40, the minimum magnitude force he needs to start the crate moving is:

phys
A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If a 3.0 x 10^(–2)-N force is applied horizontally to the free end, the force of the string on the toy, at the other end, is: A) 0.15 N B) 6.0 x 10^(–3) N C) 2.5 x 10^(–2) N...

english
need help with writing a five-sentence paragraph using chronological order on signing on to my homepage is simple

economics
1. Think of any real-world business and assume that this business intends to increase its price. Explain what this business could do to make the demand for its product more inelastic.

lube oil systems
With many lube oil systems, it is common to cool the oil before it is pumped to the end user (engine, compressor, etc). However, for large centrifugal compressors, it is common to pump the lube oil hot, and cool the oil immediately before it enter the compressor. Since we know...

compressor operations
We are operating a centrifugal compressor. The gas composition does not change during this excursion. While holding suction pressure and flowrate constant, the inlet temperature rises. What would you expect to happen to the discharge pressure, and why

Centrifulag pump curve
Q4 The system on site is a pressure sand filter, with a service curve. The filter is backwashed using the feed pump, at a higher flow rate, shown as backwash curve. Service duty point : 3 m3/h Backwash duty point : 9 m3/h Part (a) (4 marks) What is the speed of the pump to ...

compressors
We have a compressor that has two problems ¡K the engine is constantly loaded to maximum, and the life of compressor valves is short. It is suggested to reduce the lift on the compressor valves. What problem would this help? Why would this help? What problem would this ...

MATH
A CERTAIN RECIPE ASKS FOR 2/9 CUP OF GRANOLA. HOW MUCH IS NEEDED TO MAKE 7/3 OF A RECIPE?

MATH
A CERTAIN RECIPE ASKS FOR 2/9 CUP OF GRANOLA. HOW MUCH IS NEEDED TO MAKE 7/3 OF A RECIPE?

cosmology
150 photons

cosmology
z=0.5

cal
In my book I have diff answer. Can you double check your work?

cal
The end plates (isosceles triangles) of the trough show below were designed to withstand a fluid force of 5800 lb. How many cubic feet can the tank hold without exceeding this limitation? Assuming the density is 62.4 lb/ft^3, the maximum volume is ____ ft^3. View the graph at...

cal
Solve the problem. Find the area between y=(x-2)e^(x) and the x-axis from x=2 to x=5.

cal
Find the area of the region enclosed by the curve y=xsinx and the x-axis for 7π ≤x ≤8π .

cal
Evaluate the integral. ∫5sec^(4)x dx I got 5(secx+tanx)^(5)+C. is it right.

cal
I have these ans. chocies: pi(e-1) 2pi(e^(2)-1) pi(e^(2)-1) pi e Is it pi(e^(2)-1)

cal
Solve the problem. Find the volume of the solid generated by revolving the region bounded by the curve y=lnx, the x-axis, and the vertical line x=e^(2) about the x-axis.

calc
Determine if the following functions grow faster, slower, or at the same rate as the function 2e^(2x) as x → ∞. a. 3.2^(2x) b. e^(x/6) c. 1/8 e^(2x)

Astronomy
Tut tut - this is meant to be all your own work!

Statistics
Your program plans to acquire a total of 600 end items costing \$535 million over a five-year period. The first production contract is to be awarded in FY04. The number of items to be procured (not delivered) each year and their estimated cost (in then-year dollars) is shown ...

cal
i think i got the answer. thanks anyway..

cal
The function gives the distances (in feet) traveled in time t (in seconds) by a particle. Find the velocity and acceleration at the given time. s= √(t^2-5), t=3

cal
Find the largest open intervals where the function is concave upward. f(x)= x/x^2+1

cal
I was doing final review for my exam and the ans to this question is given 8x^(3/2)-1/4x^(3/2) at the end of the answer key sheet. i might have to check with my prof. But thank you Reiny & Jai.

cal
haha is it then 2x^(3/2)-1/x^(3/2)

cal
Find the largest open intervals where the function is concave upward. f(x)=x^4-8x^2

cal
Decide if the given value of x is a critical number for f, and if so, decide whether the point for x on f is a relative minimum, relative maximum, or neither. f(x)= 2x^3-3x^2-12x+18; x=2 the ans. is "Critical number, minimum at (2,-2) but don't know how?

cal
Find f"(x) for the function. f(x)= 2x^3/2-6x^1/2

cal
Use the differential to approximate the quantity to four decimal places. √(122)

cal
Where did you made error on the first one? did you typed wrong numbers or problem.

cal
Find dy for the given values of x and Δx. y=4/x^4+3√x; x=4, Δx=.5

cal
Perfect!!!

cal
Find the average value of the function on the given interval. f(x)= √x+2; [1,7]

cal
I'm lost here. I think i'm adding wrong numbers or something else here.

cal
Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle. f(x)=3/x from x=2 to x=6; n=4

cal
Evaluate dy/dt for the function at the point. y√x+1 = 12; dx/dt = 8, x=15, y=3

9th Grade Math
How to write 0.023494751 and 0.040381247 as a percent rounded to one decimal? Would it be 2.3% and 4.0%?

9th Grade Math
How to change 84.9% and 88.1% to a decimal? Would it be 0.849 and 0.881?

us history
Leading the underground railroad in to further North to Canada, was due to the Fugitive Slave Act. is it true.

Pipeline design
Sketch a preliminary layout for the following heat exchanger systems. On the layout sketch indicate pipe work manifolds, access platforms, access for construction, operations and maintenance. In your answer we are looking for thought into the relative sizes of these heat ...

cal
A conical tank (with vertex down) is 12 feet across the top and 18 feet deep. If water is flowing into the tank at a rate of 18 cubic feet per minute, find the rate of change of the depth of the water when the water is 10 feet deep. I got 81/200pi ft/min.

US History Mrs. Sue
Select the group that best embraced the beliefs of Abraham Lincoln. Abolitionists or The Free Soil Party. Is it Abolitionists.

math
A box of chalk and 2 staplers cost \$10. Three boxes of chalk and 2 staplers cost \$18. Find the total cost of 1 box of chalk and 1 stapler.

physics
suppose the diver vaults off the springboard, leaving it with an initial speed of 3.50 m/s upward. use energy conservation to find his spped when he strikes the water.

math
I need help on study links 2.9 for 5 grade

science
light has what range of wavelength

Calculus
so answer would be none or nowhere.

Calculus
g(x)= {0 if x<0 {x^3-3x if 0≤x≤3 {3 if x>3 If it was like this one. Then what? Same

Calculus
g(x)= {0 if x<0 {x^2-2x if 0≤x≤2 {2 if x>2 Find all values x=a where the function is discontinuous. Is the answer 0 and 2 or just 2?

Calculus
So not continuous at x=-8 and function is not defined right.

Calculus
f(x)= |x−8| / x+8 Is the function is not continuous at x= -8,8 or just at -8.

Calculus
So the function is defined or not defined.

Calculus
f(x)= ⎨x^2-1 / x+1, for x not = -1 ⎨8, for x=-1 I'm trying to graph and determine the values of x for which the function is continuous. Does the graph looks like a u shape opening up or a line.

Lubrication
A pump fitted with 50mm bore ball bearings uses an oil whose viscosity ranges from 100cSt at cold pump start-up to 7.5Cst when running at maximum speed and load. If these viscosities are the safe limits for the oil, specify the maximum start-up speed and the maximum running ...

Calculus
Find the limit. lim x→1 x^4-5x^3+7x^2-6x+3 / x-1

Calculus
Also suppose If lim x→6 had been lim x→5 would that had been changed the answer. Or it would be same.

Calculus
My fault. Sorry about that. Thank you

Calculus
4^9 = 262144 Is this the answer!! I got 3.

Calculus
Give an appropriate answer. Let lim x→6 f(x)=81. Find lim x→6 4^√f(x).

Mechanics
In a direct acting pressure relief valve, 64 bar pressure is acting on the conical dart seating area and the dart is kept closed by a spring force of 50 kg opposing the pressure. (5) a) Determine the bore diameter on the seat. b) What will the spring force be if a pressure of ...

Algebra
center is (-4,3)

Algebra
Find center, vertices, foci. (x+4)^2/36 + (y-3)^2/100 =1

Business Statistics
a sample of 16 people reveals the mean consumption to be 60 gallons with the standard of deviation of 20 gallons

trig
Given that P=(-1,8) and Q=(-2,1), find the component form and magnitude of the vector 3 PQ.

business math
If you can earn 5%, how much will you have to save each year if you want to retire in 35 years with \$1 million?

trig
tan(7π/4) + tan(5π/4) Does this = 0

trig
Simplify: csc^2 x sec x / sec^2 x + csc^2 x

Algebra
Determine whether the equation defines y as a function of x. y=-17

trig
tan (pi/2 - x) = sin (pi/2 - x) / cos (pi/2 - x) But sin (pi/2 - x) = cos x and cos (pi/2 - x) = sin x <=> tan (pi/2 - x) = cos x / sin x = cotan x <=> tan (pi/2 - x) * tan x = cotan x * tan x = (cos x / sin x) * (sin x / cos x) = 1

trig
simplify the expression. tan(π/2-x)tanx

trig
simplify the expression. cos^2x+sin^2x/cot^2x-csc^2x

trig
But my teacher gave the answer on the review as -1.

trig
simplify the expression. -sin^2x-cos^2x

trig
use basic identities to simplify the expression. csc θ cot θ / sec θ

Algebra
Determine whether the equation defines y as a function of x. y= -16

statistics
Investment analysts generally believe the interest rate on bonds is inversely related to the prime interest rate for loans; that is bonds perform well when lending rates are down and perform poorly when interest rates are up. Can the bond rate be predicted by the prime ...

statistics
Suppose a researcher gathered survey data from 19 employees and asked the employees to rate their job satisfaction on a scale from 0 to 100 (with 100 being perfectly satisfied). Suppose the following data represent the results of this survey. Assume that relationship with ...

statistics
Y=71745-678.964x =6495.786 So for 2012, y (8) = -972.77

statistics
Shown below are rental and leasing revenue figures for office machinery and equipment in the United States over a sever-year period according to the U.S. Census Bureau. Use these data to run a linear regression and then forecast the rental and leasing revenue for the year 2012...

physics
elena wtf are ypu smoking

Chemistry
-483kJ =-484kJ-[1.0atm[-5.60L]] =-484kJ-[5.60Latm[101j/Latm]] =-484kJ+565.5J =-483kJ

pre cal
x^2(4x^2+1)^7(76x^2+3)

Maths
what is the max value of y=x^22/10x^logx

trig
Write the complex number in trigonometric form, using degree measure for the argument. -12 - 16i

trig
Convert the rectangular coordinates to polar coordinates, using radian measure for the angle. (6, -6) 6√(2),7π/4 OR -6√(2),5π/4

trig
Solve the equation. Express your answer in trigonometric form. x^5 - 11 = 0

trig
Find the indicated roots. Write the answer in trigonometric form. Fourth roots of 256(cos 220° + i sin 220°)

trig
Use De Moivre's theorem to simplify the expression. Write the answer in a + bi form. [2(cos 240° + i sin 240°)]^5

trig
Find the dot product a*b. a= (5,-9), b=(4,-3)

trig
estimate the components of the vector. Round to one decimal place. [v] = 33.9, θ = 65.9° Find the horizontal and vertical components of v, and write in component form.

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