Tuesday

July 28, 2015

July 28, 2015

Total # Posts: 559

**chemistry **

Arrange the following aqueous solutions in order of decreasing freezing points (lowest to highest temperature): 0.10 m Na3PO4, 0.35 m NaCl, 0.20 m MgCl, 0.15 m C6H12O6 and 0.15 m CH3COOH.
*July 20, 2015*

**Physics**

M1 = 45.0 kg is a spherical mass at the origin. M2 = 16.6 kg is also a spherical mass, and is located on the x-axis at x = 78.0 m. At what value of x would a third mass M3 = 15.5 kg experience no net gravitational force due to M1 and M2?
*July 11, 2015*

**PHYSICS**

Can you please make a solution for this problem so i could understand it better...
*June 20, 2015*

**PHYSICS**

A and B run around a circular track whose cicumference is 150m. when they run is opposite directions they meet every 5 seconds, but when they run in the same direction from the some point they are together every 25 seconds. what are their rates? ans. 18m/s and 12m/s can you ...
*June 20, 2015*

**science**

how physical/mechanical and chemical weathering different?
*May 18, 2015*

**science**

how are they different?
*May 18, 2015*

**science**

can someone help me?
*May 18, 2015*

**science **

how are physical/mechanical and chemical weathering alike?
*May 18, 2015*

**PLEASE HELP ME!!**

someone please help me figure out this problem, and btw i am not asking for answers as others say... i am asking how to figure it out or for hints. :)
*May 17, 2015*

**PLEASE HELP ME!!**

UGH THIS PROBLEM IS KILLING ME!!!!!!!!!
*May 17, 2015*

** PLEASE HELP ME!!**

Last year, the Widget Corporation had $650,000 in sales. This year, sales are down 4%. How much did the Widget Corporation sell this year?
*May 17, 2015*

**math**

thank you so much!
*May 17, 2015*

**math**

is it 1.0335 and then round up?
*May 17, 2015*

**math**

would you do 7.95*0.13?
*May 17, 2015*

**math**

ok but i dont know how to do this...
*May 17, 2015*

**math**

70
*May 17, 2015*

**math**

would it be 65.95?
*May 17, 2015*

**math**

what do you mean though?
*May 17, 2015*

**math**

so can i round to 95 dollars .30????
*May 17, 2015*

**math**

wait, so would you do 100-30=70 and then round up????
*May 17, 2015*

**math**

do you do 0.30*94.95????
*May 17, 2015*

**math**

. A jacket costs $94.95. It is on sale for 30% off. Estimate the sale price.
*May 17, 2015*

**math**

do 0.06*12.95=0.777
*May 17, 2015*

**math**

. Estimate the sales tax and final cost of a book that costs $12.95 with a sales tax of 6%.
*May 17, 2015*

**math**

this problem is esay and simple, all you do is that you kinda just round up to the nearest decimal, so 0.09*112,000=10,080
*May 17, 2015*

**math**

A real estate agent receives a 9% commission for every house sold. Suppose she sold a house for $112,000. Estimate her commission.
*May 17, 2015*

**Stats**

From previous records a shipping company knows that the cost to deliver a small package within 24 hours is $15.50. The company charges $17.95 for shipping, but guarantees to refund the full charge if the delivery is not made within 24 hours. If the company fails to deliver ...
*May 5, 2015*

**Physics**

a 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 3.54-s interval
*April 20, 2015*

**Calculus I **

Hello, The pressure P and volume V of an expanding gas are related by the formula PVb=C, where b and C are constants (this holds in adiabatic expansion, without heat gain or loss). Find dPdt if b=1.6, P=12kPa, V=80cm2, and dVdt=20cm3/min. Thus far, I got d(PV)/dt= p(dv/dt) + V...
*April 10, 2015*

**Physics **

a 12 kg physics book flies through the air with a momentum of 20kg m/s. what is its speed?
*April 6, 2015*

**Physics**

Yes the original mass was 20.0kg my mistake. According to my calculations the answer will be -6m/s.
*April 6, 2015*

**Physics**

A 2.0kg object initially at rest explodes breaking into two pieces of mass 5.0kg and 15.0kg. If the 15.0kg piece moves with a speed 2m/s what is the speed of the 5.0kg piece? A. -6 m/s B. 15 m/s C. -5 m/s D. 20 m/s
*April 6, 2015*

**BOB**

A sphere of radius 20 cm and mass 1.80 kg starts from rest and rolls without slipping down a 30.0 degree incline...
*March 10, 2015*

**science**

1.40g each of CO, H2O, and H2 are sealed in a 1.41−L vessel and brought to equilibrium at 600 K. CO(g)+H2O(g)⇌CO2(g)+H2(g)KC=23.2 How many grams of CO2 will be present in the equilibrium mixture?
*March 10, 2015*

**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*

**math**

you need to find 12% of what the bill is
*March 24, 2014*