Sunday

December 21, 2014

December 21, 2014

Total # Posts: 304

**Physics**

As part of a safety investigation, two 1200kg cars traveling at 24m/s are crashed into different barriers. Find the average force exerted on the car that hits a concrete barrier and takes 0.16s to stop.
*December 7, 2014*

**Math**

Seth had a bag with 4 green, 5 yellow, and 6 blue marbles in it. If Seth draws a yellow marble and does not replace it, what is the probability that the second marble he draws is yellow?
*November 5, 2014*

**Math**

My locker combination has three digits. None of the digits are 0. What is the probability that the first digit of my locker combination is less than 3?
*November 5, 2014*

**Algebra **

What are two numbers that add to 615 but multiply to -90000? I'm trying to factor the quadratic x^2+615x-90000
*October 23, 2014*

**Physics **

An artillery shell is fired at an angle of 67.4◦ above the horizontal ground with an initial speed of 1560 m/s. The acceleration of gravity is 9.8 m/s2 . Find the total time of flight of the shell, neglecting air resistance. Find its horizontal range, neglecting air ...
*October 23, 2014*

**physics**

98. On which of these hills does the ball roll down with increasing speed and decreasing acceleration along the path? (Use this example if you wish to explain to someone the difference between speed and acceleration.) 99. If you drop an object, its acceleration toward the ...
*June 11, 2014*

**algebra**

Determine the value of each expression 25% of 200
*April 3, 2014*

**English**

How could you use the words feel and turn as a linking verb?
*January 14, 2014*

**5th grade math help**

make the mixed number an IMPROPER FRACTION,and multiply using 2/3 reciprocal being 3/2 multiply simplify see if you can simplify again
*January 13, 2014*

**physics**

A vertical scale on a spring balance reads from 0 to 220N . The scale has a length of 15.0cm from the 0 to 220N reading. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.45Hz . Part A Ignoring the mass of the spring, what is the mass m of ...
*December 10, 2013*

**Physics**

The equation of motion for an oscillator in vertical SHM is given by y=(0.60m)sin[(130rad/s)t]. Part A What is the amplitude of this motion? Part B What is the frequency of this motion? Part C What is the period of this motion?
*December 10, 2013*

**Materials Transport**

You have a kiln where theinterior is a cube with an edge length of 30 cm. The walls of the kiln are made of an insulating refactory, and are 10 cm thick. The thermal conductivity of the refractory is .06 W/mK. The interior of the kiln is at a temperature of 1250 degrees C, and...
*November 26, 2013*

**Statistics**

of 500 randomly selected people in new york city, 210 people had O+ blood. a) "42 percent of the people in NYC have O+ blood" Is the statement descriptive statistics or inferential statistics?
*November 15, 2013*

**physics**

A 72.5 kg skier is going straight down a 31.1o slope. Each ski has a contact area with the snow of 0.137 m2. Calculate the pressure that the snow exerts on each ski.
*November 12, 2013*

**College anatomy**

It was observed that blood glucose levels were falling in an individual. This event would be sensed by (a) cells in the (b) of the pancreas, causing them to release the hormone (c). This series of events would be part of an (d) loop/mechanism, serving as a self-adjusting ...
*November 11, 2013*

**chemistry **

Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 616 mmHg. (R=0.082 L-atm/K mol)
*November 10, 2013*

**chemistry **

Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 616 mmHg. (R=0.082 L-atm/K mol)
*November 10, 2013*

**chemistry **

Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 616 mmHg. (R=0.082 L-atm/K mol)
*November 10, 2013*

**physics**

A merry-go-round makes 23 revolutions in a 2.8min ride. Part A What is its average angular speed in rad/s?
*November 5, 2013*

**physics**

The driver of a car sets the cruise control and ties the steering wheel so that the car travels at a uniform speed of 14m/s in a circle with a diameter of 100m . Part A Through what angular distance does the car move in 4.00min ?
*November 5, 2013*

**physics**

A baseball player pops a pitch straight up. The ball (mass 230g ) was traveling horizontally at 36.0m/s just before contact with the bat, and 21.0m/s just after contact. Part A Determine the magnitude of the impulse delivered to the ball by the bat. Part B Determine the ...
*October 29, 2013*

**physics**

How much power must you exert to horizontally drag a 21.0kg table 15.0m across a brick floor in 20.0s at constant velocity, assuming the coefficient of kinetic friction between the table and floor is 0.500?
*October 24, 2013*

**physics**

The acceleration due to the moon's gravity at its surface is less than what it is here on the surface of the earth. The computed value of 1.6 m/s2 is consistent with what the Apollo Program astronauts observed during their explorations there. Imagine an astronaut holding a...
*October 2, 2013*

**Stats**

For X ∼ Poi(λ), show that E(X) = λ and V ar(X) = λ. (Hint: Find E[X(X − 1)] = E(X2 ) − E(X).)
*September 30, 2013*

**Stats**

The Geometric distribution is used when we want to ﬁnd the probability of performing a sequence of trials with X “failures” before the ﬁrst “success”, where a “success” occurs with some probability p. We can denote such a random ...
*September 30, 2013*

**human resources**

What is the difference between executive pay and non executive pay and controversies are associated with the disparity between them?
*August 3, 2013*

**math**

can anyone try this one
*May 4, 2013*

**math **

Find the area of the segment of the circle. Leave your answer in terms of pi. there is a circle with a shaded area that has a 90 degree triangle in it and a 3 next to one soide of the triangle
*May 4, 2013*

**social studies**

thank you so much but i found the answer
*April 21, 2013*

**social studies**

Why did pilgrims travel? a. to fight a holy war b. to organize followers c.to pay tribute to a king d. to visit holy places
*April 21, 2013*

**Calculus please help !**

Find the coordinates of the center of the ellipse represented by 4x^2 + 9y^2 – 18y – 27 = 0. For 2x^2 + xy + 2y^2 = 1, find , the angle of rotation about the origin, to the nearest degree. Find the distance between points at (–1, 6) and (5, –2). Identify ...
*April 12, 2013*

**Pre-calculus HELP PLEASE !**

(2/9, -1 2/4) ? d=10 ellipse ?
*April 12, 2013*

**Pre-calculus HELP PLEASE !**

Find the coordinates of the center of the ellipse represented by 4x^2 + 9y^2 – 18y – 27 = 0. For 2x^2 + xy + 2y^2 = 1, find , the angle of rotation about the origin, to the nearest degree. Find the distance between points at (–1, 6) and (5, –2). Identify ...
*April 12, 2013*

**Algebra**

Two questions I need help with. Find the indicated partial sum using the information given. 1. a3=4/9, a7=9/64, S6 Determine wheater the infinite geometric series has a finite sum 2. 6+ 3+ 3/2 + 3/4 +.... 3. -49 + (-7) + (- 1/7) +...
*April 8, 2013*

**Help! Algebra **

Find the common ratio r and the value of A1 with the information given. 1. A3=324 A7=64 2. A4=32/3 A8=54
*April 8, 2013*

**Math**

If the floor plan of a new building is shown the building cost $35.00 a saqure foot to construct you need to obtain insurance for the new building .how much insure?
*April 5, 2013*

** Reiny please help!Algebra **

I need help with these! I got B for 1. C for 2. and D for 3. Thanks for the help! 1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.) –8R1 +R2 -&...
*March 28, 2013*

**Algebra multiple choice! **

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in ...
*March 28, 2013*

**Algebra help!**

1.) Solve the system by triangularizing the augmented matrix and using back substitution. -x-y+z=1 x-y-4z=-7 4x+y+z=6 2.) Perform the indicated row operation, then write the new matrix. -4 4 | 4 9 -6 | 5 -2R1+ R2 ---> R2 3.) Solve the system by triangularizing the augmented...
*March 28, 2013*

**Pre-calculus; urgent ! Please help !**

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write the equation –2x + 6y = 7 in ...
*February 26, 2013*

**Calculus please help !**

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write the equation –2x + 6y = 7 in ...
*February 26, 2013*

**Math ! Please Help !**

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write the equation –2x + 6y = 7 in ...
*February 26, 2013*

**Thermodynamics**

The initial state consists of a closed system containing one mole of super-heated liquid water at 115°C and 1 atmosphere pressure. The immediate surroundings are also at 115°C and 1 atmosphere pressure. The change in state is described as this one mole of super-heated ...
*February 23, 2013*

**Calculus please help !**

Find the inner product of a and b if a= (3, 0, –1) and b= (4, –2, 5), and state whether the vectors are perpendicular.
*February 20, 2013*

**Math ! Please Help !**

Find the inner product of a and b if a= (3, 0, –1) and b= (4, –2, 5), and state whether the vectors are perpendicular.
*February 20, 2013*

**Pre-calculus; urgent ! Please help !**

Find the inner product of a and b if a= (3, 0, –1) and b= (4, –2, 5), and state whether the vectors are perpendicular.
*February 20, 2013*

**Math**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...
*February 20, 2013*

**Calculus**

oh my goodness, that was so helpful! Thankyou :) i think i got them all!
*February 20, 2013*

**Calculus**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...
*February 20, 2013*

**Math**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...
*February 20, 2013*

**Pre-calculus**

1. A triangular prism has vertices at A(2, 0, 0), B(2, 1, 3), C(2, 2, 0), D(0, 0, 0), E(0, 1, 3), and F(0, 2, 0). Which image point has the coordinates (1, 4, 3) after a translation using the vector 1, 2, 3? 2. What point represents a reflection of B over the xy-plane? B'...
*February 20, 2013*

**Pre-calculus**

Jana hit a golf ball with an initial velocity of 102 feet per second at an angle of 67° with the horizontal. After 2 seconds, how far has the ball traveled horizontally?
*February 19, 2013*

**Math**

What is 2.49 divided by 89?(BTW im not cheating im just having trouble checking my answers
*February 12, 2013*

**sience**

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
*February 6, 2013*

**business**

describe how a manager would use the critical-incident appraisal method for assessing an employee?
*February 5, 2013*

**Algebra **

I need some help figuring these. Compute each product and simplify the result. I dont have the squareroot sign so put that meaning thats where it goes with the number after it. 1. (0.3 Squareroot of 5)^2 2. (2+ squareroot of 5)^2 3. (5+4Squareroot of 10)(1-2 squareroot of 10) ...
*January 18, 2013*

**Algebra **

Rationalize each expression by building perfect nth root factors for each denominator. Assume all variables represent positive quantities. I don’t understand how to compute these. Also I don’t have the square root sign so I typed it out where it would be and the ...
*January 18, 2013*

**Algebra**

I need some help figuring these. Compute each product and simplify the result. I dont have the squareroot sign so put that meaning thats where it goes with the number after it. 1. (0.3 Squareroot of 5)^2 2. (2+ squareroot of 5)^2 3. (5+4Squareroot of 10)(1-2 squareroot of 10) ...
*January 18, 2013*

**english**

When I called the college, they said they were still accepting applications.
*December 14, 2012*

**Math, need help asap**

The ramp shown below is used to move crates of fruit to loading docks of different heights. When the horizontal distance AB is 12 meters, the height of the loading dock, BC, is 4 meters. What is the height of the loading dock DE? 12 m 8 m 9 m 15 m
*December 14, 2012*

**Statistics**

FALSE... Sorry Math Guru. Conditions for a regression analysis are We have n observations on an explanatory variable x and a response variable y. Our goal is to study or predict the behavior of y for given values of x. For any fixed value of x, the response varies according to...
*November 6, 2012*

**Physics**

A 69 kg swimmer free-falls off a 10.0 m diving platform. The diver comes to a stop 2.7 m below the water's surface. What is the magnitude of the force exerted by the water on the swimmer. (assume a positive direction is up) I calculated the force on the diver before they ...
*October 24, 2012*

**Physics**

A 69 kg swimmer free-falls off a 10.0 m diving platform. The diver comes to a stop 2.7 m below the water's surface. What is the magnitude of the force exerted by the water on the swimmer. (assume a positive direction is up) I calculated the force on the diver before they ...
*October 24, 2012*

**physics**

The maximum speed of a child on a swing is 4.90 m/s. The child's height above the ground is 0.525 m at the lowest point in his motion. How high above the ground is he at his highest point?
*October 10, 2012*

**7th grade health question**

1. eat nutrient dense food 2. a 3. b 4. d (pee goes through the urethra 5. a
*October 10, 2012*

**AP Environmental Science**

Consider the following heats, copper: 0.384J/g degrees, glass:0.502J/g degrees, water: 4.18J/g degrees, and lead:0.159J/g. Which substance once warmed, would be more likely to maintain its heat and keep you warm through a long party on a cold night?
*October 10, 2012*

**math**

how do u reduce 8 gal 9pt
*October 7, 2012*

**Biology**

some proteins (such as HBB) can vary quite a bit from species to species. others (ex., tubulin) vary little from species to species? Why?
*September 27, 2012*

**Physics**

Bob, Im not getting the same answer when i do plug in the H into finding the height of the apples and oranges
*September 16, 2012*

**Physics**

Wes and Lindsay stand on the roof of a building. Wes leans over the edge and drops an apple. Lindsay waits, 1.25s afrer Wes releases his fruit and throws an orange straight down at 28 m/s. Both pieces of fruit hit the ground simultaneously. Calculate the common height from ...
*September 16, 2012*

**Scirnce/ math**

If a pinecone was thrown from a height of 45 meters and hit the ground 4.5 seconds later, how fast was the pinecone traveling
*September 9, 2012*

**Chemistry**

How do you figure out how mch oxygen gas escaped when Potassium Chlorate is decomposed in a reation? Also what mass of Potassium Chlorate was decomposed in the experiment? I conducted the experiement but don't know how to do this.
*September 3, 2012*

**cild care**

its not c or b
*July 23, 2012*

**algebra**

if 2k - 4 = 8, then k is what
*July 16, 2012*

**math**

Ben rolls a standard number cube (sides labeled with numbers 1 through 6). Find the probability that Ben rolls a number greater than 2 or an even number.
*July 3, 2012*

**Math**

okay so im doing homework and dont understand how to do it the question is -2 2/3+ d/6= 2/3 the little slash things are fraction things
*May 20, 2012*

**Calculus**

idk what tht is hehe
*May 20, 2012*

**Geometry**

(1)Is a trapezoid a square? false (2) if all sides of a quadilateralare congruent,the quadilateral is a rhombis? true or false
*April 8, 2012*

**math**

Preform the operation and write in standard form: (8+20i)/(2i)
*April 3, 2012*

**APWH**

thesis: How did the World Wars of the 20th century demonstrate the application of “total war?”
*March 29, 2012*

**APWH**

thesis: How did the World Wars of the 20th century demonstrate the application of “total war?”
*March 29, 2012*

**chemistry**

I understand you are supposed to separate into half reactions and balance using H20 H+ and e- however, when i start doing that I get confused halfway through. this is as far as I have gotten: 4e- + 7H+ + Cr2O72- = 2Cr3+ +7H20 2Sn2+ = 2Sn4+ +4e- then cancel electrons...is this ...
*March 22, 2012*

**chemistry**

When the following reaction is balanced in acid solution, the coefficient of H+(aq) will be: Cr2O72-(aq) + Sn2+(aq) --> Cr3+(aq) + Sn4+(aq)
*March 22, 2012*

**algebra**

triangle 1 is 6,16,32 triangle 2 is 9,24 h they are similar how do i find h?
*March 12, 2012*

**koko**

how did you come up with 29? Need help bad please anyone
*March 6, 2012*

**Math help**

If a trend line had the equation: y=x+9 what y value would you expect to obtain when x is 20??
*March 6, 2012*

**math**

what are the odds in favor of randomly drawing the letter m from the letters in the word remember? would it be 2 out of 8 would you simplify it to 1 out of 4??? help
*March 6, 2012*

**Language Arts EnglishIII**

Identify the pronoun in the sentence below. Also identify the class and noun function of the pronoun using the abbreviations from the chart. For intensive pronouns, put NONE for noun function. Due to the large storm approaching, three students, Jamie, Lisa, and I, were allowed...
*March 1, 2012*

**Calculus**

integrate: (square root of (y^2 -121))/y dy, y>11. I got (12(square root of (y^2-121))/12 -sec^-1 (y/12) +C but it's not right. I'm not sure where I am going wrong.
*February 23, 2012*

**math**

sin^2x+sin^2tan^2x=tan^2x
*February 20, 2012*

**chemistry**

When 26 mL of a 120 mL stock solution containing 3.23 M CaF2 is diluted to 35 mL, how many moles of F- are in the new solution
*February 16, 2012*

**chemistry**

When 26 mL of a 120 mL stock solution containing 3.23 M CaF2 is diluted to 35 mL, how many moles of F- are in the new solution
*February 16, 2012*

**Chemistry/Engineering**

A 25 gram sample of CT is vaporized and used to fill a 5 L container. If the pressure in the container is 1.2 atm at 27 degrees Celsius, what is the molecular weight of CT in grams per mole? I used PV=nRT and found n=.2437 mol, but how do I got to grams per mole? CT is a made-...
*February 14, 2012*

**Chemistry**

At what temperature would 1.3 m NaCl freeze, given that the van't Hoff factor for NaCl is 1.9? Kf for water is 1.86 deg C/m.
*February 5, 2012*

**Chemistry**

At a certain temperature, the solubility of N_2 gas in water at 2.38 atm is 56.0 mg of N_2 gas/100 g of water. Calculate the solubility of N_2 gas in water, at the same temperature, if the partial pressure of N_2 gas over the solution is increased from 2.38 atm to 5.00 atm.
*February 4, 2012*

**Calculus**

Find the volume of the solid whose base is the region bounded by y=x^2 and the line y=0 and whose cross sections perpendicular to the base and parallel to the x-axis are semicircles.
*January 29, 2012*

**Calculus**

I use this to check my answers. I apologize for not realizing that I should have proven to you that I was doing them by myself at first.
*January 29, 2012*

**Calculus**

Find the volume of the solid formed when the region bounded by y=3x^2 and y=36-x^2 is revolved about the x-axis.
*January 29, 2012*

**Calculus**

Let R be the region bounded by y=x^2, x=1, and y=0. Use the shell method to find the volume of the solid generated when R is revolved about the line x=-11.
*January 29, 2012*

**Calculus**

Let R be the region bounded by y=x^2, x=1, and y=0. Use the shell method to find the volume of the solid generated when R is revolved about the line y=-2.
*January 29, 2012*