# Posts by Rob

Total # Posts: 391

**math**

kara needs 35 for an aquarium for 6 fish. how can she pay with the least ten and one dollar bills?

*October 11, 2012*

**physics**

A 16-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 35 N. Starting from rest, the sled attains a speed of 2.1 m/s in 9.5 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.

*October 4, 2012*

**physics**

A person pulls a toboggan for a distance of 34.6 m along the snow with a rope directed 29.3 ° above the snow. The tension in the rope is 110 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed ...

*October 4, 2012*

**Statistics**

hyu

*September 16, 2012*

**physics**

A lighthouse that rises 46.0 ft above the surface of the water sits on a rocky cliff that extends 19 ft out into the ocean from the base of the lighthouse. A sailor on the forward deck of a ship sights the top of the lighthouse at an angle of 25.0 degrees above the horizontal...

*September 9, 2012*

**math**

If JK=9x+11 and NO=28, what is the value of x

*September 4, 2012*

**Physics**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

*July 18, 2012*

**Science**

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at ...

*July 18, 2012*

**Physics**

A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work done by friction on the textbook.

*July 18, 2012*

**Physics**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

*July 18, 2012*

**Algebra**

I can not get he correct answer -10. -3/3{a+c(b+5)-(-6+a)} a=1, b=-6, c=-4

*June 26, 2012*

**Physics**

In this problem, your task is to analyze a lead balloon. The balloon in question is a hollow sphere of diameter of 20.0 m, constructed from a lead foil 0.25 mm thick and filled with helium gas. Below the balloon, a passenger basket is suspended. The mass of the passenger ...

*June 15, 2012*

**math**

in one elementary school class the following information on sports preferences was obtained: 7 liked tennis; 11 liked baseball; 9 liked soccer; 5 liked tennis and baseball; 3 liked baseball and soccer; 2 liked tennis and soccer; and 2 liked all three sports. How many students ...

*June 13, 2012*

**econimics**

Suppose that two people, Michelle and James each live alone in an isolated region. They each have the same resources available, and they grow potatoes and raise chickens. If Michelle devotes all her resources to growing potatoes, she can raise 200 pounds of potatoes per year. ...

*June 9, 2012*

**math**

whats th eanswer to the math page. why do elephants have ivory tusks? and the answer to what can you use to tie up a spaceship?

*June 6, 2012*

**algebrA math**

factor 2 t^2+5t+2

*May 15, 2012*

**algebra math**

Factor the expression 6x – 54.

*May 15, 2012*

**geometry**

william wishes to carpet his rectangular5 patio, whose dimensions are 21 feet by 18 feet. How much will it cost William to cover his patio if the carpet costs $4.95 per square yard?

*May 3, 2012*

**math**

I don't know it doesnt say why

*April 18, 2012*

**math**

Lois wants to send a box of oranges to a friend by mail. The box of oranges cannot exceed a mass of 10 kg. If each orange has a mass of 200g, what is the maximum number she can send?

*April 18, 2012*

**math**

last week bre ran 28 miles more than heather. bre ran 35 miles. how many miles did heather run?

*March 25, 2012*

**math**

last week Ann ran 27 miles less than Jen. Ann ran 19 miles. How many miles did Jen run?

*March 25, 2012*

**geometry**

The perimeterof a square is 32 inches. Find the lenght of its diagonal. the answers should be in simplest form. make a sketch and show work.

*March 21, 2012*

**geometry**

a ladder is 15 ft long and is leaning against the wall. the top of the ladder is 12 feet above the ground. find the distance from the bottom of the ladder to the wall. draw and label a picture and show work....

*March 20, 2012*

**math**

Whats the volume

*March 14, 2012*

**math**

1/3bh of a pyramid...1/3(16)(6)

*March 14, 2012*

**math**

what is the lateral area of a regular pyramid with a base 6 and slant height 8?????????????

*March 14, 2012*

**math quick question**

I got a problem that states which graph represents the sequence of 1,2.5,4,5.5,7.. Should the graph start at 1,1 or 0,1?

*March 10, 2012*

**math please**

Which Represent the first two terms of the sequence a1=2 and an=-2(an-1)^2 2, -8 -8,-128 16,1024 -2,16

*March 10, 2012*

**geometry**

what is the ratio of 3ft 9in?

*March 9, 2012*

**math**

What is the value of the output for the function, g(c) = 19 c2, if the input is 4?

*March 1, 2012*

**Physics**

A mass of 2.2kg is placed on a stiff vertical spring which has a spring constant of 950n/m. The object is then pressed against the spring until it has been compressed a distance of 77cm. The mass is then released and is allowed to be thrown up into the air. How high in the ...

*February 25, 2012*

**Physics**

A spring is mounted horizontally. A crate which has a mass of 8.5kg is pressed against the spring with a force of 350N. As a result the spring is compressed a distance of 82.0cm. The mass is then released and is allowed to slide along the horizontal, frictionless surface. What...

*February 25, 2012*

**Physics**

A box which has a mass of 14kg is sliding along a horizontal surface with a velocity of 18m/s when it encounters a frictionless inclined plane which meets the horizontal at an angle of 28 degrees. The box slides up the incline until it comes to a halt. How far up the incline ...

*February 25, 2012*

**Physics**

A 25kg crate is sitting at the bottom of an inclined plane. The inclined plane 12m long meets the horizontal at an angle of 15 degrees and has a coefficient of friction of 0.55. A force is applied to the crate so as to slide the crate up the incline at a constant speed. What ...

*February 25, 2012*

**College Geology**

assume that a particular radioactive-isotope has a half-life of 100 million years. Also assume that the parent isotope is incorporated into the minerals found in igneous rocks and that the only daughter atoms in the rock formed from the decay of the parent isotope. ...

*February 22, 2012*

**algebra**

2,968

*February 2, 2012*

**math**

6/14 Or 3/7 <--- Simplified

*February 2, 2012*

**Chemistry**

If you are using 5.25% (mass/mass) bleach solution and you determine that the density of the bleach solution is 1.08 g/mL, how many moles of sodium hypochlorite are present in a 4.00 mL sample?

*January 31, 2012*

**Chemistry**

If you are using 5.25% (mass/mass) bleach solution and you determine that the density of the bleach solution is 1.08 g/mL, how many moles of sodium hypochlorite are present in a 4.00 mL sample?

*January 31, 2012*

**college algebra**

11. Students in an accounting class took a final exam and then took equivalent forms of the exam at monthly intervals thereafter. The average score as a percent, after t months was given by

*January 31, 2012*

**APUSH**

The above answer in incorrect. Eventhough there was monopolies which were created by the govt. through loans, as all monopolies are created, thiis time period was an excellent one for the u.s.a Trists developed through innovation using the bessemer proccess and vertical and ...

*January 24, 2012*

**algebra**

find the LCM of 11(z-3)and 33(z-3)

*January 20, 2012*

**Algebra**

find the LCM of y^2+6y+9 and y^2+y-6

*January 20, 2012*

**Essay**

never mind!

*January 3, 2012*

**Essay**

I need to do an essay but need to know if it is usually blank percent rainy or blank persent sunny usually in Port Saint Lucie? Can you help or give me a website that gives me percentages on how it usually is.

*January 3, 2012*

**calculus**

prove that 5x - 7 - sin3x = 0 has at least one zero and prove that it has exactly one real zero. How am I supposed to show my work for this? I don't really understand how to show my work for the IVT. Without that I can't do any work for the MVT.

*December 16, 2011*

**Math**

It's D!

*November 29, 2011*

**math**

just the basic formulas for area, length, and width

*November 28, 2011*

**chemistry**

What is R and T stand for?

*November 26, 2011*

**physics**

One gram of water changes from liquid to solid at a constant pressure of one atmosphere and a constant temperature of 0°C. In the process, the volume changes from 0.90 cm3 to 1.10 cm3. The work done by the water is .02J, but I'm not sure how to find the internal energy...

*November 17, 2011*

**Math**

Random variables X and Y are both normally distributed with mean 100 and standard deviation 4. It is known that random variable X+Y is also a normal distribution. a. What is the mean of X+Y? b. What is the standard deviation of X+Y? I see that the mean is 200 but I don't ...

*November 15, 2011*

**6th drade math**

There are 7oz of suger in a suger 16oz box of honey.What percent of honey is suger? Round to the nearest percent.

*November 2, 2011*

**physics**

because they are opssite forces acting on eachother

*October 31, 2011*

**Chemistry**

How much energy is associated with a photon in the gamma ray region of the spectrum with a frequency of 6.6*10^5s^-1

*October 31, 2011*

**Chemistry**

Calculate the frequency of a photon of orange light whose wavelength is 6.2*10^5m. (meters)

*October 31, 2011*

**Discrete Math**

A factory makes automobile parts, 5C7, 1O6 or 3Z0, which are of 5,000 parts, what is the minimum number of parts with the same serial number?

*October 27, 2011*

**chem**

energy of a proton divided by its frequency equals?

*October 23, 2011*

**math**

10 to the 9-9 power = ? How do you come to the answer =1?

*October 19, 2011*

**Science**

If earths mass were reduced by 1/2 , but its radious satyed the same , how much would your weight change ? Would it also be reduced by half ?

*October 17, 2011*

**general chem**

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution. (b) How many moles of KBr are present in 150 mL of a 0.275 M solution? (c) How many milliters of 6.1 M HCl solution are needed to obtain 0.100 mol ...

*October 9, 2011*

**general chem**

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution. (b) How many moles of KBr are present in 150 mL of a 0.275 M solution? (c) How many milliters of 6.1 M HCl solution are needed to obtain 0.100 mol ...

*October 9, 2011*

**general chem**

Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, simply write NR. (a) Nickel metal is added to a solution of copper (II) nitrate; (b) a solution of zinc nitrate is added to a solution of magnesium ...

*October 9, 2011*

**general chem**

THank YOu Dr.BoB222

*October 9, 2011*

**general chem**

Determine the oxidation number for the indicated element in each of the following compounds: (a) Co in LiCoO2, (b) Al in NaAlH4, (c) C in CH3OH (methanol), (d) N in GaN, (e) Cl in HClO2, (f) Cr in BaCrO4.

*October 9, 2011*

**algebra**

how far can you simplify7(3-6y)

*September 29, 2011*

**physics**

A ball launched from ground level lands 3 s later on a level field 48 m away from the launch point. Find the magnitude of the initial velocity vector and the angle it is above the horizontal. (Ignore any effects due to air resistance.)

*September 28, 2011*

**science**

a car exerts tractive force, calculate the force available for acceleration

*September 25, 2011*

**Genetics**

1) A White eye (w) female Drosophila is crossed with diminutive (dm) males. The F1 wild type females are then crossed to the double mutant, white eye, diminutive males and produce the following: white eye, normal size 487 normal eye, diminutive 475 normal eye, normal size 19 ...

*September 20, 2011*

**Pen Foster**

drama exam

*August 12, 2011*

**math**

find the eqt. of tangent to the curve y=-x^2+2x-10 @ the point where the curve cuts the y-axis.[ans:y=2x-10] how do i do this because they didn't give me the point...?

*July 22, 2011*

**math**

the tangent yo the curve y=x^2 +5x -2 @ the point (1,4)intersect the normal to the same curve @ the point (-3,-8) at the point P.Find the coordinates of point P.[ans: -1/3,-16/3] just give me some hint to calculate this solution.

*July 22, 2011*

**math**

in the question it say: at the point where the curve cuts the y-axis

*July 22, 2011*

**Math**

Express as a single term in simplest form: 5/2- radical 12

*May 30, 2011*

**physics**

if i crate is been dragged with 500 n of force with a 15 degree angle what would the horizontal force be?

*May 29, 2011*

**algebra**

Tina Mixes pretzels that sell for $2 a lb with cereal that sells for $3 a lb. she wants to make an 8 lb mixture to sell for $2.50. write 2 equations to represent this info. How many lbs of pretzels and how many lbs of cereal were used to make the 8 lb mixture?

*May 24, 2011*

**Science**

List advantages of the Bay of Fundy power plant

*May 17, 2011*

**English**

In the Kite Runner, why is the story about the sultans included? What is that story about?

*May 1, 2011*

**Physics**

Tom Brady passes a football – at a velocity of 50 ft/s at an angle of 40 degrees to the horizontal – toward an intended receiver 30 yd straight downfield. The pass is released 5 ft above the ground. Assume that the receiver is stationary, is isolated and that he can ...

*April 25, 2011*

**Physics**

put paper on block

*April 25, 2011*

**Physics**

You have a tiny slip of paper and a large rectangular wooden block. If you put both of them side-by-side and drop the two to the floor from the same height, the block gets to the floor first. Can you think of (and describe) three “simple” ways (using nothing, ...

*April 25, 2011*

**Physics**

You are driving your race car around a circular test track. Which would have a greater effect on the magnitude of your acceleration, doubling your speed or moving to a track with half the radius? Why?

*April 25, 2011*

**Physics**

An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?

*April 25, 2011*

**Physics**

f a water bed is 1.81 m on each vertical side and 30 cm high. Find its weight. The acceleration of gravity is 9.8 m/s2 and the density of water is 1000 kg/m3. Answer in units of N

*April 15, 2011*

**physics**

An acorn and tree leaf fall from the same height and time. Which reaches the ground first and why?

*April 9, 2011*

**pharmacy tech**

Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.

*April 4, 2011*

**pharmacy tech**

Determine the milliliters of water needed to prepare 2 oz of a 10% solution from a 12.5% solution and distilled water.

*April 4, 2011*

**Physics- 2D Collisions**

nitially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are actually...

*March 29, 2011*

**Physics**

A tennis ball of mass 0.0609 kg is served. It strikes the ground with a velocity of 52.5 m/s (117 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 50.5 m/s at an angle of 17.7° above the horizontal. If the interaction with the ...

*March 28, 2011*

**Stats.**

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies ...

*March 28, 2011*

**Physics**

A tennis ball of mass 0.0609 kg is served. It strikes the ground with a velocity of 52.5 m/s (117 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 50.5 m/s at an angle of 17.7° above the horizontal. If the interaction with the ...

*March 27, 2011*

**Math**

a plane flies due north at 300 mi/h for 3 h then due west at 250 mi/h. If x represents the number of hours the plane is flying due west, determine for what values of x the plane will be more than 3700 mi from it's original point.

*March 8, 2011*

**statistics**

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies are...

*March 7, 2011*

**statistics**

Part 1) A physical therapists wishes to determine whether an exercise program increases flexibility. He measures the flexibility (in inches) of 12 randomly selected subjects both before and after an intensive eight-week training program and obtains the following data: Before: ...

*March 7, 2011*

**Statistics**

Part 1) Exposure to dust at work can lead to lung disease later in life. In a study of 115 drill and blast workers involved in tunnel construction the mean dust exposure was 18.0 mg-yr/m^3 with a standard deviation of 7.8 mg-yr/m^3 (sample 1). Another study of 220 outdoor ...

*March 7, 2011*

**business ethics**

Ethics systems table

*March 6, 2011*

**ENG**

Know

*March 6, 2011*

**math**

If a hot dog vendor offers 18 different condiments; how many condiment combinations are there?

*March 6, 2011*