Thursday

March 5, 2015

March 5, 2015

Total # Posts: 517

**Chemistry**

how much heat is absorbed when 63.7 grams of water at 100 degrees Celsius is converted to steam at 100 degrees Celsius? -I need help figuring out how to do this.
*March 4, 2015*

**Physics**

Two blocks are connected by a string on a pulley. One block is on an incline, and the other is hanging. The smooth inclined surface makes an angle of 35 ∘ with the horizontal, and the block on the incline has a mass of 5.7 kg. The mass of the hanging block is m = 4.0kg...
*February 25, 2015*

**PHYSICS**

A hypothetical planet has a mass 1.55 times that of Earth, but the same radius. What is g near its surface?
*February 20, 2015*

**math**

Emma os using connecting cubes to make a rectangular model with a height of one connecting cube. With her cubes she can make the model in exactly 3 different ways. If Emma has more than 12 but fewer than 17 cubes how many cubes does she have
*February 19, 2015*

**math**

Hey someone use 192 beads to make a necklace and bracelet it takes 5 times as many beads to make the necklace that the bracelet how much beads it take to make the necklace
*February 12, 2015*

**physics**

A rifle bullet is fired at an angle of 28.3° below the horizontal with an initial velocity of 177 m/s from the top of a cliff 52.2 m high. How far from the base of the cliff does it strike the level ground below?
*January 6, 2015*

**math**

At a local high school,560 out of 1060 students voted to support a community fund drive. What percent of the students did not support the fund drive? 47% is this the correct answer?
*December 19, 2014*

**physics**

A 590 kg racing car completes one lap in 14.3 seconds around a circular track with a radios of 45.0 meters. The car moves at constant speed. (A) what is the acceleration of the car? (B) what force must the track exert on the tires to produse this acceleration?
*December 11, 2014*

**math**

A ball is thrown vertically upward with an initial velocity of 5 ft/sec from a height of 20 feet. Which function models its motion? i literally am lost and have no idea how to this problem. if i could have help with the steps on how to do the problem and to get the correct ...
*November 21, 2014*

**algebra**

When Charlotte planted her tomato plant, it grew 3 inches in one week. After 5 weeks, the tomato plant was 23 inches tall. Assume the relationship is linear. Find and interpret the rate of change and the initial value.
*November 17, 2014*

**physics**

Tony Hawk skates down a ramp. If he is moving at 5.4 m/s at the bottom of the ramp and has a mass of 82 kg, how tall was the ramp?
*November 4, 2014*

**physics**

How fast will a roller coaster, with a mass of 1200 kg, be moving at the bottom of an 18 meter tall hill?
*November 4, 2014*

**physics**

Bobo jumps out of a plane 2,000 m in the air. If Bobo has a mass of 100 kg, how much kinetic energy will he have after falling for 200 m? Assume no air resistance.
*November 4, 2014*

**physics**

A team of sled rides has a mass of 180 kg. If they have 8,000 J of kinetic energy at the bottom of the hill, how tall was the hill they just tackled?
*November 4, 2014*

**physics**

Find the height of a cliff if the 87.6 kg cliff diver hits the water at 15.5 m/s.
*November 4, 2014*

**Fractions**

Fiona and camila took a load of peaches to the farmers market. During the first hour , they sold 1/2 of the peaches plus 1/2 of a peach. In the second hour, they sold 1/3 of the remaining peaches plus 1/3 of a peach. In the third hour , they sold 1/4 of what was left and 3/4 ...
*October 26, 2014*

**please check my english**

Here's all the answers for CA students D,B,D,C,A,D Thanks me later!!!! 100%
*October 13, 2014*

**english**

why is sasha in trouble in the story "a problem"
*October 10, 2014*

**physics**

A home run is hit such a way that the baseball just clears a wall 26 m high located 118 m from home plate. The ball is hit at an angle of 37 ◦ to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1 m above the ground. What is the ...
*October 6, 2014*

**German**

Hello, I require help with my German Next week I'll be starting taking additional lessons to help me with my coursework, but for now, I would be immensly grateful for your help. I've managed to do most of my tasks by myself, however there are some that are just too ...
*September 29, 2014*

**physics**

A motorcycle has a constant speed of 21.6 m/s as it passes over the top of a hill whose radius of curvature is 100 m. The mass of the motorcycle and driver is 392 kg. Find the magnitude of (a) the centripetal force and (b) the normal force that acts on the cycle.
*September 28, 2014*

**physic**

A ball is launched horizontally at 5 m/s from the top of a 45 m tall building. A man stands at rest 6 m from the base of the building. If there is a 0.3 s reaction time for the man to start moving once he sees the ball launched, find the magnitude of the man's acceleration...
*September 28, 2014*

**Physics**

Suppose that the swimmer in the figure below has a swimming speed relative to the water of 0.45 m/s, while the speed of the current is 2.0 m/s. If it takes the swimmer 160 s to cross the river, how wide is the river?
*September 24, 2014*

**spanish**

un ____ es una escuela secundaria
*September 4, 2014*

**physics**

hill that has a 37.7 % grade is one that rises 37.7 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal?
*August 21, 2014*

**physics**

A highway is to be built between two towns, one of which lies 47.0 km south and 69.0 km west of the other. (a) What is the shortest length of highway that can be built between the two towns, and (b) at what angle would this highway be directed, as a positive angle with respect...
*August 21, 2014*

**algebra**

There were a total of 2000 tickets sold at a recent sporting event on Saturday. The cost of an adult ticket was $4.00 and a child's ticket was $2.00. The total amount of money collected was $6400.00. How many adult and child tickets were sold at the game?
*August 18, 2014*

**English**

Hi, I need help with MLA citing. This is just an example paragraph but please tell me if Im citing correctly : Tom was sad. Howard states," Tom leaned over the table with disappointment" (Howard 23).
*July 29, 2014*

**Math**

How do I graph a slope of 2/3 passing through the point of (-3,-4). Please help. I was given this answer, but I am unsure if it is correct **Since the slope is 2/3, go right up 3 and up 2 and plot another point.
*July 28, 2014*

**Physics -- check answer please**

correct
*July 28, 2014*

**Math**

How do I write an equation for (-3,-8) that has a slope of -2? So far this is what I came up with. y=mx+b m=-2 y=-2x+b -8=-2x-3
*July 28, 2014*

**Math**

Find the slope of 8x+4y=7 in parallel and perpendicular lines. Please help me figure this out? Still need help
*July 28, 2014*

**Math**

Find the slope of 8x+4y=7 in parallel and perpendicular lines. Please help me figure this out?
*July 28, 2014*

**Math**

How do I find the slope of the line in simple form? 4x+5y=3
*July 28, 2014*

**Math**

I wanted to see if I was solving this problem correctly. A line passes through the point (-3,-8)and has a slope of -2.Write an equation for this line. y=mx+b m=-2 y=-2x+b -8=-2(-3)+b
*July 28, 2014*

**Math**

How do I graph a slope of 2/3 passing through the point of (-3,-4). Please help
*July 28, 2014*

**Math**

How do I find the points, so that O can graph it. y=1/4x+4
*July 27, 2014*

**Calculus**

For f(x)=2(x+5)^3 +7 Find and classify the extreme values, determine where the function is increasing and decreasing, where it is concave up and concave down, and any points of inflection. I understand this is using the first and second derivative tests, but I can't find ...
*July 22, 2014*

**calculus**

Find a point c satisfying the conclusion of the Mean Value Theorem for the function f(x)= x^1/3 on the interval [1,8] I got f'(c)= 1/7 but am not sure where to go from there.
*July 22, 2014*

**Calc**

A cup of coffee at 90 degrees celsius is put into a 30 degree celsius room when t =0 . The coffee's temperature, f (t ) , is changing at a rate given by f '(t )=-8(0 .8) t degrees celsius per minute, where t is in minutes. Estimate the coffee's temperature when t =...
*July 21, 2014*

**Calc**

Nevermind! Solved it. Sorry guys. :)
*July 21, 2014*

**Calc**

t 0 5 10 r(t)0 90 0 A shop is open 9 AM - 7 PM. The function r(t), gives the rate at which customers arrive (in people/hour) at time t, where t measures time in hours since 9 AM. Suppose that the salespeople can serve customers at a rate of 75 people per hour. At 4 hrs after ...
*July 21, 2014*

**Calc**

q 0 125 250 375 500 625 750 C'(q) 27 35 41 45 43 46 51 Give fixed cost = 8800 and cost of producing 250 units is 17425, how much would the total cost increase if production were increased one unit, to 251 units?
*July 21, 2014*

**History**

Why should Uncle Toms Cabin be a part of the US History curriculum? Please explain!
*July 19, 2014*

**History**

Can you please tell me what chapters you found that information from so I can state it?
*July 19, 2014*

**History**

Yes but I cant put it into words.
*July 19, 2014*

**History**

In Uncle Tom's Cabin, (the book) did blacks have a racial caste system? Please explain
*July 19, 2014*

**calculus**

What is the derivative of y=sin^3(x)+sin(x^3) ?
*July 17, 2014*

**Chemistry**

What kind of compound is table salt and how does it dissolve in water? Would salt dissolve in vegetable oil? Why or Why not?
*May 13, 2014*

**Chemistry**

Predict which compound will have the higher boiling point and explain how you made your choice by including intermolecular forces. 1. H2O or CH2O 2. CS2 or CH4
*May 12, 2014*

**Chemistry**

Iodine 131 is a radioactive isotope. After 4.00 days, 70.8% of a sample of 131I remains.What is the half life of 131I?
*April 26, 2014*

**Chemistry**

The density of solution of sulfuric acid is 1.29 g/cm3, and it is 38.1% acid by mass. What is the mass, in grams, of 25.0 mL of sulfuric acid?
*April 24, 2014*

**Statistics**

The ABC Self-Concept Inventory has a split- half reliability coefficient of 0.90 and the XYZ Self-Concept Inventory has a Spearman- Brown reliability coefficient of 0.90. And if all factors are equal, which instrument would be chose to use?
*April 22, 2014*

**Math**

Which expression is equivalent to 9(4+r)?
*April 22, 2014*

**statistics**

If an instrument requires some professional judgments in scoring, then the manual should also include information on a. Interrater RELIABILITY b. Corrections of the reliability coefficients using the Spearman-Brown formula c, Both KR 20s and KR 21s d. Test retest reliability ...
*April 21, 2014*

**Social Studies (History)**

How can Fred Korematsu be compared to Homer Plessy?
*April 21, 2014*

**Social Studies (History)**

What were three effects of World War 2
*April 21, 2014*

**Social Studies (History)**

I think that those countries wanted Dictators because they weren't powerful enough to make their own decisions.
*April 21, 2014*

**Social Studies (History)**

Why did Germany, Japan, Italy, and Soviet Union all move to dictatorship?
*April 21, 2014*

**chem**

Wow, I feel stupid...I need some sleep. Thanks so much!!
*April 15, 2014*

**chem**

Ok then, I got 750.81 torr. I know that Partial pressure = total pressure x the mole fraction Does this mean that I have to find moles of O2 and H2?
*April 15, 2014*

**chem**

I got .988atm, but what do I do with the temp?
*April 15, 2014*

**chem**

A sample of oxygen gas was collected via water displacement. Since the oxygen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 26.4 °C is 725 torr, what is the partial pressure of oxygen? The vapor ...
*April 15, 2014*

**chemistry**

What is the density (in grams per liter) of a gas at STP if 4.16 L of the gas in a bulb at 43.7 °C, and 737.9 mm Hg weighs 0.262 g?
*April 13, 2014*

**Chemistry**

(NH4)2S is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.200 M (NH4)2S solution. [NH4] = M [S] = M
*April 3, 2014*

**science**

Agreed. D fault-block mountains
*March 24, 2014*

**chemistry**

Knowing the concentration of a solution allows us to find all of the following except A. the mass of a solute. B. the mass of the solvent. C. the volume of the solvent. D. the concentration of a solution when conditions change.
*March 19, 2014*

**Earth science**

incorrect , the answer is C, The ability of the atmosphere to capture and recycle energy emitted by the Earth surface is the defining characteristic of the greenhouse effect. The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by ...
*March 13, 2014*

**Algebra**

Neil gets in an elevator at the 30th floor and it begins to move downward at a speed of 8 feet per second. After 12 seconds the elevator is 240 feet above ground. a. Let y= the height in feet of the elevator 'x' secinds after Neil got in. Write an equation to show the ...
*March 4, 2014*

**Maths**

WhAt is x 3x9^x=81
*December 1, 2013*

**Chemistry**

Assume that the normal blood buffer contains 0.00080 M carbonic acid and 0.0085 M hydrogen carbonate, the pKa = 6.35 for carbonic acid and the volume of blood in the body is 7.00 L. The blood pH, due to disruption is now 7.20. What is the ratio of [HCO3−]/[H2CO3] now ...
*November 11, 2013*

**Chemistry**

If you need to prepare 250.0 mL of a pH 5.00 buffer that has a total buffer concentration of acetic acid + sodium acetate of 0.050M, how many moles of each will you need to prepare the solution? Given solutions of acetic acid and sodium acetate with concentrations of 0.10M and...
*November 11, 2013*

**Math**

How do you factor 12v^2-25v-7?
*November 6, 2013*

**Chemistry**

How many lone pairs are in a chlorite ion (CLO2)- ?
*October 14, 2013*

**Chemistry**

What would be the speed of the following particles if they had the same wavelength as a photon of green light (λ = 500.0 nm)? Proton (mass = 1.673*10^(-24)g) =_____ neutron (mass = 1.675*10(-24)g) =_____ electron (mass = 9.109*10^(-28)g) =_____ alpha particle (mass = 6....
*October 10, 2013*

**Chemistry**

for both? and then add them?
*October 10, 2013*

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?
*October 10, 2013*

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?
*October 10, 2013*

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?
*October 9, 2013*

**Physics -URGENT-**

A 55 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.4 m/s^2, determine the magnitude of the acceleration of the boy toward the girl in m/s^2
*October 6, 2013*

**PHYSICS**

55 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.4 m/s 2 , determine the magnitude of the acceleration of the boy toward the girl in m/s^2
*October 6, 2013*

**Language Arts**

i have info about when it was invented and where it got its name from
*September 30, 2013*

**Language Arts**

yes I have some info on the history of the alphabet already.
*September 30, 2013*

**Language Arts**

can you help with a thesis statement about the history?
*September 30, 2013*

**Language Arts**

I am going to start with the history/ origin of the alphabet. Then I am going to talk about how it influences communication. What would be another point to sum that up?
*September 30, 2013*

**Language Arts**

I want to also incorporate the history
*September 30, 2013*

**Language Arts**

Its an informative speech on the alphabet.I want to talk about how the alphabet is essential in our daily lives and how everything in some form is based on knowing and understanding of the alphabet.
*September 30, 2013*

**Language Arts**

3 main points for a speech on the alphabet
*September 30, 2013*

**math**

suppose that an employee ears $28,000 in the first year on the job. Each year thereafter, the employee receives a %3 raise. Find the total amount that the employee earned in all 20 years.
*September 24, 2013*

**social studies**

which of the following groups benefitted the least from the prosperity of the second industrial revolution? a .textile workers b. railroad workers c. factory workers d. famers
*September 9, 2013*

**Physics**

I'm sorry, yes that is what I meant, but the difficulty I'm having is solving for z. I get it to a certain point and then I get stuck.
*September 4, 2013*

**Physics**

Consider the equation v = 1/8zxt2. The dimensions of the variables v, x, and t are [L]/[T], [L], and [T], respectively. The numerical factor 8 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the same dimensions? (Use ...
*September 4, 2013*

**physics**

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is L = 81.0 m. In part (a) the person is looking at the base of the antenna, and his line of sight makes an angle of &...
*September 4, 2013*

**Biomechanics**

What will be the vertical velocity at take off for a high jumper in order for them to clear a height of 2m?
*July 31, 2013*

**math find the max/min**

f(x) = x2 + 2x - 9
*July 21, 2013*

**math**

What is the solution of the equation |2-x | =3
*June 3, 2013*

**Pre-calculus**

As you drive down a mountain, you see a sign that says there is a 6 degree grade over the next 5 miles. What is the change in elevation over that 5 mile stretch?
*May 22, 2013*

**math URGENT thx**

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2
*May 22, 2013*

**math**

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2
*May 21, 2013*

**Math**

The AC voltage coming out of a standard wall plug in the United States can be expressed as the function V(t) = 120sin(120*pi*t), where t represents time (in seconds) and V is the voltage. We will let t be greater than or equal to 0 for simplicity. A. Make an accurate sketch of...
*May 6, 2013*

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