Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 2,190

**math**

(8x to the 3rd power) (4x to the 2nd power) simplifi
*April 26, 2012*

**Physics**

Janet jumps off a high diving platform with a horizontal velocity of 1.73 m/s and lands in the water 1.8 s later. How high is the platform? The acceleration of gravity is 9.8 m/s2 . Answer in units of m
*April 22, 2012*

**life orientation**

ENVIRONMENTAL PROBLM
*April 20, 2012*

**Physics**

On a frictionless, horizontal air track, a glider oscillates at the end of an ideal spring of force constant 2.30 N/cm. The graph in the figure shows the acceleration of the glider as a function of time. Find the mass of the glider. Find the maximum displacement of the glider ...
*April 19, 2012*

**chem**

Calculate the molarity of a solution made by dissolving 0.150 in enough water to form exactly 730 of solution
*April 18, 2012*

**Physics**

A mass is oscillating with amplitude A at the end of a spring. How far (in terms of A) is this mass from the equilibrium position of the spring when the elastic potential energy equals the kinetic energy?
*April 18, 2012*

**Geometry.**

A park has a circular swimming pool. The diameter of the pool is 18 ft. What is the distance traveled if you swim around the edge of the pool once? Use pi = 3.14 A) 36 ft B) 169.65 ft C) 113.10 ft D) 56.52 ft I think it is [D] but I'm not sure.
*April 15, 2012*

**Geometry!**

The distance around the equator of Saturn is about 378,675 km. What is the equatorial diameter of Saturn? Use pi = 3.14. A) 241,209 B) 241,194 C) 120,584 D) 120,597 I think it is [D] but I'm not sure.
*April 15, 2012*

**Geometry**

Given that circle Q has a radius of 42, and radii line QR and line QS form an angle of 180, find the exact length of arc RS.
*April 15, 2012*

**Geometry**

Point A is 5 feet from the center of the circle and 11 feet from point B. Line AB is tangent to circle O at A. Find OB to the nearest tenth.
*April 15, 2012*

**Math**

For the following data... 1. Provide evidence as to whether this data set if Gaussian or non Gaussian. 2. Determine the normal reference range. 3. Define a cut-off. Describe how a ROC curve can be used to determine such. 95 95 81 95 98 79 88 98 84 79 98 84 81 96 102 86 90 101 ...
*April 12, 2012*

**Physics**

A satellite used in a cellular telephone network has a mass of 2160 kg and is in a circular orbit at a height of 670 km above the surface of the earth. What is the gravitational force Fgrav on the satellite? Take the gravitational constant to be = 6.67×10−11 N*m^2/...
*April 12, 2012*

**Physics**

Four identical masses of mass 900 kg each are placed at the corners of a square whose side lengths are 15.0 cm. What is the magnitude of the net gravitational force on one of the masses, due to the other three?
*April 12, 2012*

**Physics**

At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.790 m/s^2 if the acceleration due to gravity at the surface has magnitude .
*April 12, 2012*

**Statistics**

18. Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z scores: Above .10? Below .10? Above .20? Below .20? Above 1.10? Below 1.10? Above -.10? Below -.10? You need to ...
*April 9, 2012*

**Math**

Brandon's bedroom floor is 12ft by 8ft. How many square feet of carpet are needed to replace his old carpet?
*April 8, 2012*

**Math**

June rides the 15 foot tall ferris wheel at the city fair. She enters the ride at the bottom. If the ride makes 8 complete rotations before stopping, what is the total distance that June travels?
*April 8, 2012*

**math**

2x+2y=1 This one is obvious. Just divide the coefficients by each other, and take any inequalities and subtract them by themselves. 3x-y=6 This one is a bit tougher. First, you need to square everything. Then add 4, subtract 7, and take the square root of it all. It may not ...
*April 7, 2012*

**Physics. PLEASE HELP!!**

6 m/s
*April 7, 2012*

**Physics**

A stiff uniform wire of mass M_0 and length L_0 is cut, bent, and the parts soldered together so that it forms a circular wheel having four identical spokes coming out from the center. None of the wire is wasted, and you can neglect the mass of the solder. What is the moment ...
*April 5, 2012*

**Physics**

A 5.80 kg ball is dropped from a height of 14.5 m above one end of a uniform bar that pivots at its center. The bar has mass 9.00 kg and is 6.40 m in length. At the other end of the bar sits another 5.30 kg ball, unattached to the bar. The dropped ball sticks to the bar after ...
*April 5, 2012*

**physics**

What is the density of nitrogen gas (molecular mass = 28 u) at a pressure of 1.2 atmospheres and a temperature of 284 K?
*April 3, 2012*

**Physics**

A bowling ball rolls without slipping up a ramp that slopes upward at an angle (beta) to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes. What is the acceleration of the center of mass of the ball? Express your answer in terms of the ...
*April 3, 2012*

**programming**

you should probably mention the language its in.
*April 3, 2012*

**Calculus**

Use linear approximation, i.e. the tangent line, to approximate (1/0.504) as follows: Find the equation of the tangent line to f(x)=1/x at a "nice" point near 0.504. Then use this to approximate (1/0.504).
*April 3, 2012*

**Calculus**

i havent posted 7 questions...
*April 3, 2012*

**Calculus**

A 12 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 4 ft/s, how fast will the foot be moving away from the wall when the top is 8 feet above the ground?
*April 3, 2012*

**Calculus**

Water is leaking out of an inverted right conical tank at a rate of 0.0115 m^3/min. At the same time water is being pumped into the tank at a constant rate. The tank has height 11 meters and the diameter at the top is 7 meters. If the water level is rising at a rate of 0.17 m/...
*April 3, 2012*

**Calculus**

A water tank is shaped like an inverted right circular cone with a base radius of 14 feet and a height of 25 feet high. If water flows into the tank at a rate of 20 ft^3/min, how fast is the depth of the water increasing when the water is 18 feet deep?
*April 3, 2012*

**Calculus**

A boat is pulled into a dock by means of a rope attached to a pulley on the dock. The rope is attached to the front of the boat, which is 7 feet below the level of the pulley. If the rope is pulled through the pulley at a rate of 18 ft/min, at what rate will the boat be ...
*April 3, 2012*

**Calculus**

A spherical snowball is melting so that its diameter is decreasing at rate of 0.1 cm/min. At what is the rate is the volume of the snowball changing when the diameter is 12 cm?
*April 3, 2012*

**Calculus**

A street light is at the top of a 19 foot tall pole. A 6 foot tall woman walks away from the pole with a speed of 7 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 feet from the base of the pole?
*April 3, 2012*

**AP CHEM **

When 0.03 moles of lead(II) nitrate are dissolved in enough water to make 266 milliliters of solution, what is the molar concentration of nitrate ions? Answer in units of M I already tried moles per liter and it says it is wrong.
*April 1, 2012*

**Chemistry**

Yeah I'm referring to the phase diagram and the Solid/Liquid line
*March 29, 2012*

**Chemistry**

I think the negative sign implies that the slope between S and L is negative so as you increase Pressure you will get a small T. But what formula did you use to find delta T.
*March 29, 2012*

**Fantel**

The heat of vaporization of water is 40.66 kJ/mol. Assuming sweat is 100% water, how much heat is removed from your body through the evaporation of 3.50 g of sweat?
*March 28, 2012*

**matth**

hi if the second term of a sequence is root(2) and the seventh term is 8 what is the nth term equation(Geometric sequence) thanks
*March 26, 2012*

**statistics**

Elesha.. I don't understand your answers
*March 26, 2012*

**Math**

the volume of a rectangular prism is 256 cubic centimeters. What is the volume of a similar rectangular prism that has edge lengths one fourth as long as the edge lengths of the original prism?
*March 26, 2012*

**science**

a 2000 kg sedan is traveling west at 25m/s. How would the sedan's momentum change if it slowed down to 10 m/s?
*March 25, 2012*

**probability/binomial**

i'm having trouble with probability and the binomial thm, could i get a good website with problems
*March 24, 2012*

**Math**

I think they're all correct
*March 19, 2012*

**alg2trig**

1-(1/a)/1-(1/a^2)
*March 11, 2012*

**physics**

A 1.1 kg hammer slams down on a nail at 5.0 m/s and bounces back at 1.0 m/s. If the impact lasts 1.0 ms, what average force is exerted on the nail?
*March 11, 2012*

**chemitry**

thanks
*March 9, 2012*

**chemitry**

I have a list of chemicals, how do i know if they are alkanes and alcohols
*March 9, 2012*

**Math**

Transform the equation by completing the square: y^2 + 2x - 6y - 7 = 0
*March 8, 2012*

**calculus**

Find a unit vector U such that the rate of change of f in the direction of U at the given point is maximum. point being (3,5,pi) I know hos to do this when given a direction but since im asked to ind the unit vector first it kinda throws me off. do i just use my point? like ...
*March 8, 2012*

**physics**

A high-speed sander has a disk 8.00 cm in radius that rotates about its axis at a constant rate of 1100 revolutions per minute. Determine the angular speed of the disk in radians per second.
*March 7, 2012*

**chemistry**

what are van der waals forces
*March 7, 2012*

**Physics**

Haha this is a trick question. Electricity is a hoax
*March 6, 2012*

**Chemistry**

is this answer correct? these form need to verify is these answers are correct. ty
*March 5, 2012*

**algebra**

M times 2/3 equals 1 - 13/15
*March 4, 2012*

**physics**

216000000
*March 4, 2012*

**math**

12 students wanted to go on a field trip. that was 3/4 of the class. how many students are in the class
*March 4, 2012*

**chemistry**

what is the difference between an inhibitor and a catalyst in a chemical process?
*March 1, 2012*

**physics**

A science museum has asked you to design a simple pendulum that will make 25.0 complete swings in 85.0 {\rm s}. How long should the pendulum be? in meters
*February 29, 2012*

**physics**

FFFFFFFFFFFFUUUUUUUUUUUUUU
*February 28, 2012*

**physics**

A 750.0 N man, carrying a 1.9 kg physics textbook, stands at the center of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome his difficulty, he throws his textbook horizontally at a ...
*February 27, 2012*

**physics**

A 750.0 N man, carrying a 1.9 kg physics textbook, stands at the center of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome his difficulty, he throws his textbook horizontally at a ...
*February 26, 2012*

**physics**

A car is sitting at the top of an inclined plane, which is 5.2 meters long and meets the horizontal at an angle of 12 degrees. The cart is then allowed to roll to the bottom of the incline. What will be the velocity of the cart at the bottom of the incline. (4.61m/s) Please ...
*February 25, 2012*

**chemistryhelp**

for example will AlCl3 conduct less electricity than NaCl
*February 24, 2012*

**chemistryhelp**

i also had a question on conductivity, if i have an ionic solution with 2 salts at same mass will the one with least molecular mass conduct more electricity (bc there are more ions)
*February 24, 2012*

**chemistryhelp**

but can i use other salts?
*February 24, 2012*

**chemistryhelp**

if i made a simple circuit with an NaCl in between is that similar to what the electrolyte in a battery does so does that mean that i can put NaCl in substitute of whatever is currently in the battery
*February 24, 2012*

**chemistryhelp**

also I was researching and I was wondering what an ionic current was
*February 24, 2012*

**chemistryhelp**

can the electrolyte be a salt (NaCl of KCl)
*February 24, 2012*

**chemistryhelp**

so it transfers the electrons (based on what I know)
*February 24, 2012*

**chemistryhelp**

what does the electrolyte in batteries do?
*February 24, 2012*

**highschool bio**

Cells are specialized in structure to match their function. Compare cell specialization in gametes with other examples of cell specialization.
*February 22, 2012*

**Physics**

A child pushes a merry go-round from rest to a final angular speed of 0.78 rev/s with constant angular acceleration. In doing so, the child pushes the merry-go-round 1.6 revolutions. What is the angular acceleration of the merry go-round? v=d/t .78rev/s = 1.6 rev / t t= 1.6 ...
*February 21, 2012*

**physics**

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
*February 20, 2012*

**physics**

A 690 kg elevator starts from rest. It moves upward for 2.56 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period?, What is the power of the elevator motor during an upward cruise with ...
*February 19, 2012*

**statistics**

Suppose that the weights of airline passenger bags are normally distributed with a mean of 48.08 pounds and a standard deviation of 3.13 pounds. A)Let X represent the weight of a randomly selected bag. For what value of c is P(E(X) - c < X < E(X) + c)=0.84? Give your ...
*February 19, 2012*

**physics**

On a frozen pond, a 13.2 kg sled is given a kick that imparts to it an initial speed of v0 = 2.48 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.123. Use the work kinetic energy theorem to find the distance the sled moves before coming to rest.
*February 18, 2012*

**Math ratios**

The ratio of cars to vans in a parking lot was 5 to 2. There were 28 cars and vans in the parking lot. How many cars were in the parking lot? How many vans were in the parking lot?
*February 18, 2012*

**Biology**

Sure.
*February 17, 2012*

**physics**

A wave traveling in the + x direction has an amplitude of 0.35 m, a speed of 5.2 m/s, and a frequency of 14 Hz. Determine: 3.1.the wavelength, (2) 3.2.the wave number, (2) 3.3the angular velocity, (2) 3.4. the equation of the wave
*February 16, 2012*

**emergency physics**

The 2nd harmonic of a string of length 40cm and linear mass density 1.11g.m has the same frequency as the 5th resonance mode of a closed pipe of length 1.4m. Find the tension in the string. use 340 for speed of sound
*February 15, 2012*

**Math**

33.4 because it takes into consideration probability, you have to look at the number and depending on weether it is even or odd you either increase or decrease
*February 15, 2012*

**physics**

The rider sees a traffic queue ahead. He applies the brakes and reduces the speed of the motorbike from 18 m/s to 3 m/s. Use the equation in the box to calculate the kinetic energy lost by the motorbike. 1 over 2× mass × speed
*February 15, 2012*

**Math**

An airplane leaves the airport and flies due west 170 miles and then 240 miles in the direction 200°30'. Assuming the earth is flat, how far is the plane from the airport at this time( to the nearest mile)?
*February 14, 2012*

**physics**

A car travels at a constant speed around a circular track whose radius is 2.60 km. The car goes once around the track in 344 s. What is the magnitude of the centripetal acceleration of the car?
*February 13, 2012*

**networking**

In an analog cellular structure, what is needed to establish a valid authentication?
*February 13, 2012*

**Physics**

If a total mass of 11.1 kg falls 5.23 m and all of the mechanical energy is converted to internal energy, by how much will the internal energy of the water increase? The acceleration of gravity is 9.81 m/s 2 . Assume no energy is transferred as heat out of the vessel to the ...
*February 12, 2012*

**math word problem**

lexi and maria had $250.oo altogether. After lexi spent 2/5 of her money and Maria spent $40.00 they had the same amount of money left.How much money did lexi have in the beginning?
*February 12, 2012*

**Mathematics**

OPQRS is a right pyramid whose base is a square of sides 12cm each. Given that the slant height of the pyramid is 15cm. Find the height of the pyramid, the volume of the pyramid, and the total surface area of the pyramid by first drawing the net of the pyramid.
*February 11, 2012*

**Physics**

A rocket of mass 4.5 e5 kg is in flight. Its thrust is directed at an angle of 58.5° above the horizontal and has a magnitude of 7.50e6 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizonal.
*February 10, 2012*

**trigonometry**

the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65 degree and 40 degree respectively find the two legs. Answer using law of sines pls
*February 10, 2012*

**Mathematics**

The mass of Aravin to the mass of Bob is in the ratio 17 : 13. If the difference in their masses is 12 kg, find their combined mass.
*February 8, 2012*

**math**

a rope 60m long and 5cm in diameter is coiled tightly. Estimate, correct to one significant figure, the radius of the 'circle' formed. ( please could we have working out).
*February 7, 2012*

**physics**

At a time t after being projected from the ground, a projectile is displaced x units horizontally and y units vertically above its point of projection. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What are the horizontal and vertical ...
*February 6, 2012*

**physics**

a box slides down a frictionless hill. the spring stops it. when the box stops how much has the spring compressed. the hill is 5m high, the mas of the box is 20 kg, and the spring constant is 350 n/m
*February 5, 2012*

**physics**

A person throws a 2.5 lb stone into the air with an initial upward speed of 15 ft/s. Make a free-body diagram for this stone (a) after it is free of the person’s hand and is traveling upward, (b) at its highest point, (c) when it is traveling down ward, and (d) while it ...
*February 1, 2012*

**math**

The diagram shows a shape, all the corners are right angles, all the measurements are in cm explain why (x+4) (x +5) - 6 15
*January 31, 2012*

**chemistry**

Suppose that 1.78 x 10^3 kg of Fe are obtained from a 5.80 x 10^3 kg sample of Fe2O3. Assuming that the reaction goes to completion, what is the percent purity of Fe2O3 in the original sample?
*January 31, 2012*

**Measurement:: Metric Units**

A classroom table is 1 m wide and 1.75 m long. How many 39 cm wide chairs can fit around the table?
*January 31, 2012*

**math**

Our big black cat had some kittens, one was white one was black and one was tabby. How many cats lived in our house?
*January 30, 2012*

**chemistry**

correct answer is: -5133.3-[(8x-393.5)+9(-241.8)] = 190.9 since it is an enthalpy of formation, the value has to be negative, thus the correct answer is -190.9
*January 29, 2012*

**physics**

A 0.25 kg cube of iron is heated and its temperature rises from 23.0 C to 45.0 C. How much heat entered the cube in Joules and in Calories?
*January 26, 2012*

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