Sunday

March 29, 2015

March 29, 2015

Total # Posts: 683

**Chemistry**

In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 72.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C. Assuming the solution has a heat capacity of 4.18 J/°C&...
*February 19, 2015*

**Organic Chemistry**

Gas Chromatography: The internal standard technique is used. A volatile component which does not interfere with the GC analysis (i.e. it gives a separate peak) is added to the sample which is then analyzed. For example, 10.0 mg of D was added to 50.0 mg of the mixture of A, B...
*February 15, 2015*

**math**

Tickets to a concert cost $12 for kids and $15 for adults. A total of 300 tickets were sold and total receipts were $4140. How many were adult tickets and how many kids?
*February 4, 2015*

**PHYSICS**

A ball is shot upwards with an initial speed of 31 m/s. While it is in the air it experiences a constant downwards acceleration of 10 m/s2. Find its velocity 1, 2, 3, and 4 seconds after being released.
*February 4, 2015*

**history help **

12. __________ and _________ first attracted settlers to the West.
*November 18, 2014*

**Genetics**

Sorry, one codon is composed of three nucleotides that code for one amino acid. Therefore, a protein of 375 amino acids would have a coding region on the mRNA strand with 375*3 nucleotides.
*November 16, 2014*

**Genetics**

I'm sorry, MULTIPLIED by 3
*November 16, 2014*

**Genetics**

One codon is composed of three amino acids, so the coding region would be 375 divided by 3. Your welcome:)
*November 16, 2014*

**Physics**

For the situation: "A moving crate slides to a halt on a rough surface" Does temperature increase, decrease, or not change? Are work and heat positive, negative, or zero? Does thermal energy increase, decrease, or not change? My answer key says temperature increases...
*November 16, 2014*

**Physics**

An 8.46 kg block drops straight down from a height of 0.90 m, striking a platform spring having a force constant of 9.90 102 N/m. Find the maximum compression of the spring
*November 11, 2014*

**PHYSICS**

Why does air pressure decrease with increasing altitude? (SELECT ALL THAT APPLY) The weight of the air above is smaller The weight of the air below is smaller Less air above pushes down There is more air below to push up more strongly Cold air is less dense Hot air rises
*October 29, 2014*

**PHYSICS**

Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75X 10^3 kg/m^3 at the bottom of a 12.5 m deep lake
*October 29, 2014*

**Physics**

Why does air pressure decrease with increasing altitude? a) The weight of the air above is smaller b) The weight of the air below is smaller c) Less air above pushes down d) There is more air below to push up more strongly e) Colder air is less dense f)Hot air rises
*October 28, 2014*

**Physics**

In a huge oil tanker, salt water has flooded an oil tank to a depth of h2 = 4.50 m. On top of the water is a layer of oil h1 = 7.55 m deep, as in the cross-sectional view of the tank as shown in the figure. The oil has a density of 0.700 g/cm3. Find the pressure at the bottom...
*October 28, 2014*

**Physics**

Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75 103 kg/m3 at the bottom of a 12.5-m-deep lake
*October 28, 2014*

**BIOLOGY**

Which of the following is/are true about where electrons end up? The last molecule of the ETC in the mitochondrian donates electrons to water and releases oxygen The last molecule of the ETC in the mitochondrion donates electrons to oxygen and makes water NADH and FADH2 ...
*October 22, 2014*

**BIOLOGY**

Fermentation: (Select all that are true) Uses pyruvate to accept electrons Uses pyruvate to donate electrons Regenerates NADH Regenerates NAD+ Directly makes ATP Allows glycolysis to continue in the cytoplasm making ATP Allows oxidative phosphorylation to continue int he ...
*October 22, 2014*

**Physics**

How would you set this up? A 250-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 28° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
*October 21, 2014*

**Chemistry **

2NaN(3) > 2 Na +3N(2) What mass of sodium azide must be reacted to inflate and air bag to 70.0 L at STP?
*October 19, 2014*

**Physics**

A 55-kg soccer player jumps vertically upwards and heads the 0.45-kg ball as it is descending vertically with a speed of 29 m/s. If the ball is in contact with the player's head for 16 ms, what is the average acceleration of the ball? (Note that the force of gravity may be...
*October 3, 2014*

**Physics**

A 2.87 kg object initially moving in the positive x-direction with a velocity of +4.87 m/s collides with and sticks to a 1.96 kg object initially moving in the negative y-direction with a velocity of -2.55 m/s. Find the final components of velocity of the composite object. (...
*October 2, 2014*

**Psycology**

Sara is 30 years old and came from a two-parent, low-income household in an urban environment. She has reached a turning point at which she has begun to appreciate her current bidirectional life stage in conjunction with heredity and the circumstances of her environment. Sara ...
*August 25, 2014*

**Statistics**

Six homes are randomly surveyed from a group of fifteen homes. How many different random samples are possible
*August 14, 2014*

**math**

A building is 17 ft high, what is the lenght the ladder must be to extend 3 ft higher than wall
*July 13, 2014*

**HCA 311 Health Care Financing & Information System**

Ms. Sue, No, I did not know that. How do I show you my text?
*June 15, 2014*

**HCA 311 Health Care Financing & Information System**

Using the example of “From the Front Lines” in Chapter 6 of your text, calculate the break even for the number of procedures. Use an electronic spreadsheet to show how you computed the break even and embed the spreadsheet in your paper. Discuss the impact of the ...
*June 15, 2014*

**Biomechanics**

Take a metal coat hanger and straighten it. Hold a 10 inch straight section so it points up in the air. Holding the bottom still and using the other hand to bend it to the side, move the end 1 inch then release it. What happens? Repeat this with 2 inches, 3 inches, etc, until ...
*June 14, 2014*

**Math**

You have 2 hundred feet of fencing to use for building a rectangular dog pen. find the dimensions of the pan having the greatest possible area
*June 4, 2014*

**Math**

what are all of the possible rational roots for x to the third power- x squared-x +8=0?
*June 3, 2014*

**Mathematics, simplify**

5ac+10ab-25ad
*May 5, 2014*

**math**

No it can not
*April 29, 2014*

**chemistry**

1.00 of an aqueous solution contains 1.52g of a compound used in antifreeze. If the osmotic pressure of this solution at 20.0 degree C is 448 torr, calculate the molar mass of the antifreeze compound
*April 28, 2014*

**chemistry**

what is the boiling point of 0.212 m lactose in water?
*April 28, 2014*

**chemistry**

calculate the vapor pressure of a solution 0.53 mol of cholestrol in 4.1 molof toluene at 32 degree C. pure toluene has a vapor pressure of 41 torr at 32 degree C
*April 28, 2014*

**MATH**

A movie theater ticket booth opens at 10 am. There are four tellers who divide the customers evenly. The tellers have served 16 customers so far this morning. which expression represents the unknown number of customers each teller will serve? Let c represent the additional ...
*April 22, 2014*

**Bio 20**

When blood enters a vein from a venule, the blood pressure A) remains constant because of the heart's pumping action B) increases because of the size of the vein C) increases because of stretch receptor stimulation D) decreases because of the size of the vein Please help!!!!!
*February 21, 2014*

**Math**

what angle in radians corresponds to 3 rotations around the unit circle
*February 18, 2014*

**Math**

Is there a formula used to find the surface area of a prism? For ex. A triangular prism
*February 18, 2014*

**precal**

A kite flier wondered how high her kite was flying. She used a protractor to measure an angle of 36 degrees from level ground to the kite string. If she used a full 140-yard spool of string, how high, in feet, was the kite? (Disregard the string sag and the height of the ...
*February 14, 2014*

**Pre-Cal **

A Ferris wheel is 40 meters in diameter and boarded from a platform that is 5 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes one full revolution every 7 minutes. You make two complete ...
*February 14, 2014*

**physics**

a 95-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is: (A) accelerating upward with an acceleration of 1.8 m/s^2 (answer 1.1 * 10^3 N) (B) moving upward at a constant speed (answer 931 N) (C) accelerating downward with an ...
*January 31, 2014*

**physics **

a 15-g bullet is fired from a rifle. it takes 2.50 * 10^-3s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 715 m/s. assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet. (answer ...
*January 31, 2014*

**physics **

a boat has a mass of 6800 kg. its engine generate a drive force of 4100 N, due west, while the wind exerts a force of 8000 N, due east, and the water exerts a resistive force of 1200 N due east. what is the magnitude and direction of the boats accelerations? (answer 0.309 m/s^...
*January 31, 2014*

**science**

1.Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? -a solar eclipse -a lunar eclipse -a total lunar eclipse -a penumbra 2.Which of the following statements about a lunar eclipse is true? -A lunar eclipse can occur when the ...
*January 15, 2014*

**science**

What mass of AgN03 would you dissolve in water to get 1g of silver?
*January 13, 2014*

**Chemistry**

thanks!
*January 13, 2014*

**Chemistry**

What mass of AgN03 would you dissolve in water to get 1g of silver?
*January 13, 2014*

**math**

20x100=2000 2000/80=25 So the answer would be 25
*January 9, 2014*

**Pre Calc**

How many pounds of dog food worth $.80 per pound must be mixed with dog food worth $.65 per pound to make a mixture of 60 pounds worth $.70 per pound?
*January 9, 2014*

**Pre Calc**

Thank you!
*January 9, 2014*

**Pre Calc**

the units digit of a 2 digit number is 4 less than the tens digit. the number it names is 3 less than 9 times the sum of the digits what is the number?
*January 9, 2014*

**Physics **

A 2 kg object is moving 6 m/s. It compresses a spring 1 meter that has a spring constant of 8 N/m
*November 18, 2013*

**chemistry**

2 questions, I'm Having trouble figuring out how to calculate the moles of a solute in a solution based on the molarity and the volume. Here is what I'm working with. 1) "Use molarity of the stock solution of aspirin/Fe(No3)3(aq) (0.0044mol) and the total volume ...
*November 6, 2013*

**chemistry**

What is the formula for predicting the grams of Aspirin produced from reacting Salicylic Acid and Acetic Anhydride?
*November 5, 2013*

**chemistry**

Thank you, I was stumped!
*November 5, 2013*

**chemistry**

What is the formula for predicting the grams of Aspirin produced from reacting Salicylic Acid and Acetic Anhydride?
*November 5, 2013*

**Math**

I am part of a whole. I am less than one-half but greater than four tenths. I am a decimal with the digit 2 in my hundredths place. What number am I?
*October 16, 2013*

**Chemistry**

A solution contains an unknown amount of dissolved magnesium. Addition of 3.38×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in this solution?
*October 3, 2013*

**math**

The equation 2wcubed. Do you cube w first then multiply by 2 or do you multiply w times 2 first and then cube the sum?
*September 10, 2013*

**Physics 210**

A football kicker is trying to make a field goal from 42.0m. If he kicks at 35∘ above the horizontal, what minimum speed is needed to clear the 3.10m high crossbar?
*September 10, 2013*

**literature**

what is scope malala
*September 9, 2013*

**Math 7th grade**

Thanks! Great help! :)
*September 4, 2013*

**Math 7th grade**

Write a mixed number for each time period. Be sure each fraction is in lowest terms. 8:00am to 9:20 am Not sure how to set up
*September 4, 2013*

**Math**

If the number of male students and female students in each of 3 classes is equal, and the average number of males in each class is 30, What is the total number of students in all 3 classes? *My answer is 180, but I'm not sure.
*August 13, 2013*

**Math**

You are driving at 35.8 m/s when you see a roadblock 100 meters ahead. If you break at a safe deceleration rate of about -4.5m/s^2, how fast will you be going when you reach the roadblock?
*June 3, 2013*

**Algebra 2**

How do you simplify?: -4x/x-x^2
*May 27, 2013*

**Eng B**

A is wrong
*May 1, 2013*

**math 5th**

Estimate teh area of the circle and use 22/7 for pie. Teh circle shows line all teh way accross measruing 28cm. Find area. Can some one explain how
*April 24, 2013*

**chemistry**

how many liters are occupied by 0.908 mol of nitrogen at 108 degrees C and 0.858 atm pressure?
*April 23, 2013*

**geometry**

For a cone, if the radius was quadrupled and the slant height was reduced to one sixth of its original size, what would be the formula to find the modified surface area?
*April 15, 2013*

**Statistics**

1 should be ¼ so it should be drawn 25 times 2 should be ½ so it should be drawn 50 times 5 should be ¼ so it should be drawn 25 times Avg=10/4=2.5 S2=(2.25+.25+.25+6.25)/4=9/4=.25 so S=1.5 ES=100(2.5)=250 SE=√100 (1.5)=15 A. number of 2's B. Sum...
*March 28, 2013*

**pre calculus**

find the average rate of change of f(x)=x^3-5x+3: a. from -6 to -3 b. from -1 to 2 c. from 2 to 8 I am so lost, can someone please show me how to do this?
*March 27, 2013*

**math**

use the rational zero theorem to find all the real zeros of the polynomial function. use the zeros to factor f over the real numbers: f(x)=4x^4+9x^3+30x^2+63x+14 I cant even find sample problems to help me figure this out. help me please?
*March 27, 2013*

**Trig **

How do I use the unit circle to evaluate tan(-3pi/4)
*March 25, 2013*

**math**

A large cylinder has a volume of about 5,400 cubic cm. A small cylinder is similar in shape to the larger cylinder with a scae factor of 2/3.Which measurement is closest to the volume of a cylinder. f)1600cubic cm g)2400 cubic cm h)2700 cubic cm j)3600 cubic cm The answer is ...
*March 19, 2013*

**science**

mac-hine 622-4463
*March 14, 2013*

**Chem**

if 15 g of nitrogen reacts with 15 g of hydrogen, 10.5 g of ammonia is produced. what is the percent yeild of this reaction?
*March 7, 2013*

**Algebra**

Oh! So it'll be: 5*7=35 35+50=85 Will save 85 dollars after the seventh month. Thanks.
*March 3, 2013*

**Algebra**

355
*March 3, 2013*

**Algebra**

After one month at a new job you decide to save $50. Each month you plan to increase your savings by five dollars. a.)Write an explicit formula to model the amount you will save each month. b.)How much will you save in the seventh month?
*March 3, 2013*

**english 3**

In the 1920s, there was a boom in? consumerism. religion. world travel I believe it is world travel???
*March 1, 2013*

**Algebra 2**

4.)A diamond is purchased for $3500. Its value increases 5% each year. Find the value of the diamond after six years.
*February 25, 2013*

**Physics**

A 2.1 kg mass is connected to a spring with spring constant k= 180 N/m and unstretched length 16 cm. The pair are mounted on a frictionless air table, with the free end of the spring attached to a frictionless pivot. The mass is set into circular motion at 1.3 m/s. Find the ...
*February 21, 2013*

**Trig **

A pendulum swings through an angle of 22 degrees each second. If the pendulum is 30 inches long, how far does its tip move each second?
*February 20, 2013*

**Algebra**

how do I solve (16)^3 +48(16)^2
*February 13, 2013*

**math**

I am a 2-digit number over 50. When you put me in groups of 7, two are left over. The sum of my digits is 11. What number am I?
*February 5, 2013*

**math**

complete the table for the equation y=x+6
*January 24, 2013*

**math-algebra 1**

At 8am, Minnie Mouse leaves home driving 35 mph. A half hour later Mickey Mouse drives 50 mph to catch up to her. If Mickey Mouse is delayed 15 minutes with a flat tire, at what time will he catch up to Minnie Mouse
*January 15, 2013*

**7th Grade Literature**

scope malala
*December 11, 2012*

**physics**

A coil spring is extended by 4.4 cm when it supports a 1.00- N weight. If an identical spring is joined to the end of the first one, what is the extension of the combined spring when it supports the same 1.00- N weight? Assume the spring masses to be negligible
*December 4, 2012*

**Physics**

A physics student wants to build a spring gun that when aimed horizontally will give a 35.0- g ball an initial acceleration of 'g' by releasing a spring that has been compressed 18.0 cm. What is the velocity of the ball as it emerges from the gun?
*December 4, 2012*

**Chemistry**

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 2.7 5.2 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 246 kg. Calculate the pressure in pascals exerted by the shelf ...
*December 1, 2012*

**physics**

A train travels at a constant speed around a curve of radius 225 m. A ceiling lamp at the end of a light cord swings out to an angle of 20.0º throughout the turn. Draw a free body diagram? What is the speed of the train?
*November 20, 2012*

**Pre-calc**

Evaluate the trigonometric functions by memory or by contruscting appropriate triangles for the given special angles. (a) csc 30deg (b) sin pi/4
*November 20, 2012*

**Physics **

A 21.1 g ball of clay is thrown horizontally at + 38.7 m/s toward a 1.2 kg block sitting at rest on a frictionless surface. The clay hits and sticks to the block. A. What is the speed of the block and clay right after the collision? m/s B. Use the block's initial and final...
*November 7, 2012*

**English**

What grammatical structure is the italicized portion of the sentence? 1. (Headed by a senior), the group drew up rules for School Spirit Week. - nominative absolute 2. My most valuable coin, (one from Spain), is worth more than $100.00. - prepositional phrase with a gerund 3. ...
*November 4, 2012*

**English**

It is impossible to have an indirect object without a subject, transitive verb, and a(n) _____. noun preposition direct object intransitive verb
*November 4, 2012*

**physics**

An archer shoots an arrow horizontally at a target 13m away. The arrow is aimed directly at the center of the target, but it hits 57cm lower. What is the initial velocity?
*October 23, 2012*

**Physics**

An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale reads 265 N. Chris’s...
*October 22, 2012*

**Chemistry**

If there were 197g of sulfuric acid in your car battery, how many grams of baking soda would you need to completely neutralize the acid. Here is the balanced equation: H2SO4(aq) + NaHCO3(s)....NaSO4(aq) + 2CO2(g) + 2H20(l)
*October 21, 2012*

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