Saturday
August 2, 2014

Posts by Ethan


Total # Posts: 160

trigonometry
A tent pole is 85 feet high. A cable is attached to the ground 200 feet from the tower base. How long is the cable? What is the measure of the angle the cable makes to the ground?

physics
Two stars are 4.40 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.03 m and just detects these stars as separate objects. Assume that light of wavelength 550 nm is being observed. Also assume that diffraction effects,...

Biology: Genetics
In guinea pig, short hair (L) is dominant to long hair (l) and the heterozygous condition for yellow coat (Y) and white coat (y) gives cream coat. A short haired guinea pig is bred to long haired white guinea pig and one of the offspring is a long haired baby guinea pig. a. Wh...

Calculus
A spherical oil tank with a radius of 10 feet is half full of oil that weighs 60 pounds per cubic foot. Its top is 6 feet underground. How much work is needed to pump the oil out of the tank through a hole in its top? How do I solve this? Does the fact that it its top is 6 fee...

Calc
I did the problem. I found the fluid force to be 54 times the integral from -3 to 0 of (-y)(2)(root(9-y^2)dy my final answer was 972 pounds. Is that correct? note from my work: h(y)=-y L(y)=2x=2root(9-y^2)

Calc
A cylindrical slime tank is placed so that the axis of the cylinder is horizontal. Find the fluid force on a circular end of the tank if the tank is half full, assuming that the diameter is 6 feet and the slime weighs 54 pounds per cubic feet?

pre-algebra
Can you help

math
How to tell 4/7 on a ruler

math
What is 4/7 in inches

math
K Thanks

math
What is 4/7 in inches

math
How to tell 4/7 on a ruler

math
Thank you

math
What does 1/10 equal in percent?

math
Thank u :-)

math
Dave sent five emails every 6 minutes for 30 minutes. Lee sent 4 emails every 5 minutes for 30 minutes. Who sent more emails?

math
1)I AM greater than 15 and less than 40 if you double me I become a number that ends in 0 1/5 of me is equal to 5 2) if you multiply me by 2 ,I become a number greater than 20 and less than 40 if you multiply me by 6,I end in 8 if you multiply me by 4 I end in 2 Help me figure...

Physics
An object is dropped from rest. What is its instantaneous speed when it has been in motion for 7 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/s

Chemistry
In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species from most to least: HClO, OCl, OH^-, H30^+, H20

math
how do I find the volume of a rectangular prism height 2 ft, width 5 1/2 ft length 9 3/8 ft?

Physics
This is a projectile motion question. A ball with a mass of .4 kg, initially at rest is kicked directly toward a 3 meter fence from a point 20 meters away. The initial velocity is 17 m/s at an angle of 35 degrees. The ball is hit by nothing and there is no wind resistance, but...

math
Two investments earn a total annual income of $2825. One investment is in a 6.75% annual simple interest certificate of deposit. The other is in a 7.25% tax free annual simple interest account. The total amount invested is 40,000. Find the amount in invested in the certificate...

math
When i am rounded to the nearest tens I am 1,000. I am the same when read forward or backward, I can be two different numbers. Who am I?

Geometry
graph each set of lines to form a triangle. find the area and perimeter. y=2, x=5 , and y=x Answer is Area = 4.5 units Perimeter = 6 + square root of 2. I don't know how to graph this. What does y=x mean?

Physics
At a county fair, a boy takes his teddy bear on the giant Ferris wheel. Unfortunately, at the top of the ride, he accidentally drops his stuffed buddy. The wheel has a diameter of 14.6 m, the bottom of the wheel is 2.4 m above the ground and its rim is moving at a speed of 1.0...

Integral Calculus
Sorry, I misread that as 2x instead of x^2.

Integral Calculus
To solve that last integral, you have to use the substitution rule. u= x^2 + 1 du= 2x Therefore the integral becomes: -1/2∫(2/u) du Factor out the 2 -∫1/u du Integrate -ln(u) Which is equal to -ln(x^2 +1) Since u= x^2 + 1

Physics
I understand how the first and third equations are used to find the answers, but how is the second equation (mg = Tcosa) used?

Physics
An external force F is holding a bob of mass 725 g in a stationary position. The angle that the massless rope makes with the vertical is θ = 33°. (a) What is the magnitude, F, of the force needed to maintain equilibrium in N? (b) What is the tension in the rope in N?

Advanced Algebra
Jim begins a job with a starting salary of 27000 dollars. she is guaranteed a raise of 4.75% each year. Sarah also starts a job with a salary of 27000 dollars, she is guaranteed a raise of 1500 dollars each year. What will be Jim's salary after five years

Chemistry
Calculate the cell potential for this voltaic cell at 298K if it is constructed using solutions of .25M Ni(NO3)2 and .01M Cu(NO3)2 Any explanation would be spectacular

Chemistry
A voltaic cell utilizes the following reaction and operates at 298K 3Ce{4+}(aq)+Cr(s)--->3Ce{3+}(aq)+Cr{3+}(aq) {}=Charge What is the EMF of this cell under standard conditions? What is emf of cell when [Ce{4+}]=2.1M, [Ce{3+}]=.13M, and [Cr{3+}]=2.0*10^-2

Chemistry
A voltaic cell utilizes the following reaction and operates at 298K 3Ce{4+}(aq)+Cr(s)--->3Ce{3+}(aq)+Cr{3+}(aq) {}=Charge What is the EMF of this cell under standard conditions? What is emf of cell when [Ce{4+}]=2.1M, [Ce{3+}]=.13M, and [Cr{3+}]=2.0*10^-2

Chemistry
Consider the voltaic cell Zn(s) + Cu{2+}(aq)--> Zn{2+}(aq)+Cu(s) {}=charge Under standard conditions, what is the maximum electrical work, in Joules that can accomplish if 60 g of copper is plated out?

Chemistry
Cytochrome, a complicated molecule that we will represent as CyFe2+, reacts with the air we breathe to supply energy required to synthesize adenosine triphosphate (ATP). At pH 7.0 the following reduction potentials pertain to this oxidation of CyFe2+: O2(g) + 4 H+(aq) + 4 e- ...

Chemistry
Complete and balance the following equation: Cr2O7{2-}(aq)+CH3OH(aq)-->HCO2H(aq)+Cr{3+}(aq) Any feedback would be great, thank you so much.

Physics
A diver performing a double somersault spins at an angular speed of 4.5 π rad/s precisely 0.70s after leaving the platform. Assuming the diver begins with zero initial angular speed and accelerates at a constant rate, what is the diver’s angular acceleration during t...

Physics
A girl sitting on a merry-go-round moves counterclockwise through an arc length of 3.36m. If the girl’s angular displacement is 2.96 rad, how far is she from the center of the merry-go-round? Answer in units of m.

Physics
A figure skater begins spinning counterclockwise at an angular speed of 4.6π rad/s. During a 4.6s interval, she slowly pulls her arms inward and finally spins at 7.6π rad/s. What is her average angular acceleration during this time interval? Answer in uni...

Physics
The tension in a string from which a 5.4kg object is suspended in an elevator is equal to 53.02N. What is magnitude of the acceleration a of the elevator? The acceleration of gravity is 9.8 m/s^2

Physics
A 40.7kg wagon is towed up a hill inclined at 18.1 degrees with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 139N in it. Assume that the wagon starts from rest at the bottom of the hill, and neglect friction. The acceleration of gravi...

Physics
Karen has a mass of 62.60 kg and she rides the up escalator at Woodley Park Station of the Washington D.C. Metro. Karen rode a distance of 62 m, the longest escalator in the free world. How much work did the escalator do on Karen if it has an inclination of 35°?

Physics
An 845-N sled is pulled a distance of 190 m. The task requires 1.70 104 J of work and is done by pulling on a rope with a force of 124 N. At what angle is the rope held?

Pre-Algrebra
I(220-a-r)+r I=.5 a=45 r=85

math
Can you please give me a example of a - and + multi step equation

math-probability
There is a 10/49 chance that BOTH of them are running.

math-probability
Disregard my previous answer. You should add the probabilities. 7/7 chance.

math-probability
Multiply the two probabilities together. 2 5 10 - x - = -- 7 7 49 There is a 10/49 chance that AT LEAST one of them is running on a given day. I think.

Algebra
You actually need parentheses around '2200 + 1.50x' when you are dividing to find the average. So (2200 + 1.5x)/x would be my answer. (I removed the 0 after 1.5 also, as 1.5 is the same number as 1.50.)

English/Commas
I'm not sure, but I think that the first sentence needs another comma to separate the state from the city (if Winston is a city in Colorado). Also, in the first sentence, I think that John Pearson is the person living in Colorado, and not being addressed. Therefore, I don&...

geometry
"I get another chance" is the hypothesis. "I will do better" is the conclusion.

Calculus
When a particle is located a distance x meters from the origin, a force of cos(x/4) newtons acts on it. How much work W is done in moving the particle from x = 1 to x = 3?

Chemistry
Thanks for the help!

Chemistry
Need a lot of help! Specific gravity of a drug is 0.9815. How many cc of this drug should be administered for a dose of 215mg?

math
In 69 games, a player blocks 234 shots, what is his blocks per ratio?

Calculus
The widths (in meters) of a kidney-shaped swimming pool were measured at 3-meter intervals as indicated in the figure. Use the Midpoint Rule with n = 4 to estimate the area S of the pool if a1 = 15.5, a2 = 18, a3 = 17, a4 = 14, a5 = 12.5, a6 = 12, and a7 = 12.

Math
Janice said that if you cut a cube into two parts you form 2 smaller cubes. Ling said that 2 rectangular prisms are formed. Who is correct? Explain.

Math
Expand [1+x^2(1+x)]^7 in ascending powers of x as the term in x^8.

Please Help!!!
given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi

calculus
given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi

calculus
given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi the area under the graph from 0 to pi/2 is 1 the area under the graph from pi/2 to pi is...

Geometry
the measure of an angle is 7 less than 10 times its supplement

chemistry
350.ml of .25M KOH is reacted with 250.ml of .30M H3PO4. Determine which is the limiting reagent, the molarity of the salt formed, and the final molarity of the reactant that was in excess.

Math
insert grouping symbols into 2x3^3+4 to get it to equal 4374 and 279,936.

math
Ok idk haah post if u like this coment

algebra
(4a^3b^2-14a^2b-18ab^2)/(2ab)

algebra
(4a^3b^2-14a^2b-18ab^2)/(2ab)

algebra
(4a^3b^2-14a^2b-18ab^2)/(2ab)

us history
abrham lincoln as a young adult

Calculus
lim sin2x x->0 ----- x How do I get rid of the x on the bottom in order to solve this problem? Thanks!

algebra
A CAN'S DIAMETER IS 3 INCHES, AND IT HEIGHT IS 8 INCHES. WHAT IS THE VOLUME OF THE CAN.

Math
Use the product rule to find the derivative of (2x^2 + 3)(3x + 5).

math/alg
Use the product rule to find the derivative of (2x^2 + 3)(3x + 5).

Math
what is the rule of a table with x numbers of 1, 4, 8, and 9 and y numbers of 5, 14, 26, and 29

physics
How fast must a cetrifuge rotate in order for a particle 9cm from the axis of rotation to experience an acceleration of 115000g's

Physics
A chain is held on a frictionless table with 1/3 of its length hanging over the edge. If the chain has length L = 33 cm and mass m = 21 g, how much work is required to pull the hanging part back onto the table?

math
I am a number between 20 and 30.When you put me into 6 equal groups,there is an even number in each group and 1 left over. i cant figure out how to solve this

MAth(Someone please help)
What would the function H(x)=0.002x^2+0.005x-0.029 look like?

Math (Truly Need Help)
H(x)= 0.002x^2+0.005x-0.029 where x is the speed of the car in miles per hour. How can I rewrite the function so that x represe the speed in kilometers per hour. [Find H(x/1.6)]

Math
H(x)= 0.002x^2+0.005x-0.029 where x is the speed of the car in miles per hour. How can I rewrite the function so that x represe the speed in kilometers per hour. [Find H(x/1.6)]

Geometry
What is the length of the midsegment of the trapezoid made by the vertices A(0, 5), B(3, 3), C(5, -2) and D(-1, 2). Show equations and all work that leads to your answer.

Physics
Only two horizontal forces act on a 9.1 kg body. One force is 5.3 N, acting due east, and the other is 1.6 N, acting 56° north of west. What is the magnitude of the body's acceleration?

pre algebra
40.7

Physics
If a - b = 2.4c, a + b = 5.8c, and c = 1.3i + 4.9j, then what are (a) the x component of a, (b) the y component of a, (c) the x component of b, and (d) the y component of b? a, b, and c are vectors

Physics
If B is added to C = 6.5i + 4.6j, the result is a vector in the positive direction of the y axis, with a magnitude equal to that of C. What is the magnitude of B?

english
take the first definition then double one letter to spell a word Example Slang word for a police officer - cop A place wher chickens are kept - coop Q. Your male boy - before long - Q. A written sales pitch - To put two and two together Q. longing for something to happen - jum...

English
I have to write an outline on The Sun Also Rises by Ernest Hemingway, and I can't seem to find an appropriate thesis statement for such a paper. I was hoping someone could help me. I was thinking something along the lines of: In The Sun Also Rises, Hemingway uses character...

Calculus
If a ball is thrown in the air with a velocity 44 ft/s, its height in feet t seconds later is given by y = 44t - 16t2. (Round your answers to one decimal place.) (a) Find the average velocity for the time period beginning when t = 2 and lasting 0.5 second. ft/s (b) Find the av...

Calculus
factor 7x+42

math
factor 6x^2-1

Calculus
I'm stuck at part a, I don't know what the function would be

Calculus
The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May it cost her $410 to drive 300 mi and in June it cost her $470 to drive 600 mi. (a) Express the monthly cost C as a function of the distance driven, d, assuming that a linear relatio...

Physics
An electron moving along the x axis has a position given by x = 14 te-t m, where t is in seconds. How far is the electron from the origin when it momentarily stops?

Physics
An electric vehicle starts from rest and accelerates at a rate of 2.3 m/s2 in a straight line until it reaches a speed of 17 m/s. The vehicle then slows at a constant rate of 1.4 m/s2 until it stops. (a) How much time elapses from start to stop? (b) How far does the vehicle mo...

Physics
(a) If the position of a particle is given by x = 16t - 7t3, where t is in seconds and x is in meters, when is the particle's velocity zero? (b) When is its acceleration a zero?

Physics
A car travels up a hill at a constant speed of 33 km/h and returns down the hill at a constant speed of 60 km/h. Calculate the average speed (in km/h) for the round trip.

Physics
A startled armadillo leaps upward, rising 0.515 m in the first 0.203 s. (a) What is its initial speed as it leaves the ground? (b) What is its speed at the height of 0.515 m? (c) How much higher does it go?

Physics
During a hard sneeze, your eyes might shut for 0.58 s. If you are driving a car at 92 km/h during such a sneeze, how far does the car move during that time?

Physics
A hot-air balloon is ascending at the rate of 13 m/s and is 62 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?

Physics
Because Earth's rotation is gradually slowing, the length of each day increases: The day at the end of 1.0 century is 1.0 ms longer than the day at the start of the century. In 72 centuries, what is the total (in hours) of the daily increases in time (that is, the sum of t...

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