Wednesday

September 28, 2016
Total # Posts: 344

**Physics**

A dentist's drill starts from rest. After 3.30 s of constant angular acceleration it turns at a rate of 2.1 104 rev/min. (a) Find the drill's angular acceleration. rad/s2 (b) Determine the angle (in radians) through which the drill rotates during this period. rad

*October 6, 2011*

**critical thinking (just explain the question plz)**

can u explain this question for me or rephrase it because i dont understand what it means by fact-based subject matter or value-based subject matter. Does your hypothesis test fact-based subject matter or value-based subject matter? Briefly explain.?

*October 5, 2011*

**Physics**

A 2.4 kg object attached to a horizontal string moves with constant speed in a circle of radius R on a frictionless horizontal surface. The kinetic energy of the object is 95 J and the tension in the string is 315 N. Find R.

*October 4, 2011*

**Physics**

A 79.0-kg fullback running east with a speed of 4.00 m/s is tackled by a 93.0-kg opponent running north with a speed of 3.00 m/s. (a) Why does the tackle constitute a perfectly inelastic collision? (b) Calculate the velocity of the players immediately after the tackle. ...

*October 4, 2011*

**Physics**

Question Part Points Submissions Used A 45.0-kg girl is standing on a 160-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.44 m/s to the right...

*October 4, 2011*

**Physics**

The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 22.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average force on the ...

*October 4, 2011*

**Physics**

A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0037 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 2.7 102 ft/s, find the average force ...

*October 4, 2011*

**critical thinking please help**

True or false: It is the case that if an argument is inductively correct then the conclusion is factually correct as well

*October 4, 2011*

**cell bio**

Sketch a transition phase diagram with two curves; one for C18:0 and a second for C18.1. Label X and Y. Add a third curve for what you might predict would happen if a nonionic detergent like Triton X-100 were present in the C18:0 preparation

*October 2, 2011*

**cell bio**

NTP hydrolysis is used in two ways to drive directionality of the targeting and translocation phases of secretion. What are the principles of these two mechanisms?

*October 2, 2011*

**Calculus**

f'= 2x+5 F'(1) is 7

*October 2, 2011*

**Chemistry**

I'm adding NaOH

*September 29, 2011*

**Chemistry**

Calculate the volume of 2 M acetic acid needed to prepare 50 ml of 0.1 M acetate buffer.

*September 29, 2011*

**Physics**

When a 3.00-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.07 cm. (a) What is the force constant of the spring? N/m (b) If the 3.00-kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on ...

*September 27, 2011*

**economics please help**

Use the supply and demand model to explain what happens to the equilibrium price and the equilibrium quantity for frozen yogurt in the following cases. d.There is a sudden increase in the price of milk. im confused with this one.

*September 27, 2011*

**economics**

Can you please exlain to me if I'm wrong not just correct me. ps. Ceteris paribusor the following markets, show whether change causes a shift in supply curve, a shift in demand curve, a movement along the supply curve, and/or a movement along the demand curve. a.housing ...

*September 26, 2011*

**Math**

(1/25)^1/2 i know the answer is 0.02 but how do you find it in a fraction without using a calc?

*September 25, 2011*

**Math, Please Help!!!**

Foil.

*September 19, 2011*

**organic chemistry**

b,e,g

*September 18, 2011*

**physics**

A eye pupil of 1 cm diameter can resolve about what angle in radians? First of all I don't understand what they mean by resolve. Resolve the light coming into the eye?

*August 31, 2011*

**physics**

the equation that I think I need is P = P0 + ρgh where P is 1 atm and P0 is 1/3 atm but I get a height of 3.06 x10^-4 meters which seems like a vvery small amount

*August 15, 2011*

**physics**

suppose you were able to blow air out of your mouth at one third of an atmosphere pressure. How tall a column of water could your mouth air pressure push up a straw? I know atm pressure is 1 atm but I'm really confused about how to go about this problem. thanks!

*August 15, 2011*

**math/physics**

The ratio of the mass of your body (50 kg) to a dollar bill(1 gram) is? body: 50 kg= 50,000 g 50000/1 so the ratio is 50,000? (That seems like too much to me)

*August 14, 2011*

**Physics**

Clap your hands and estimate the energy and power released as sound waves. I know Kinetic energy= 1/2*m*v^2 and Power is KE/t but how do I find the velocity of the sound wave made from clapping my hands? and for the mass do I use the mass of my hands? thanks

*August 13, 2011*

**mat**

harvest cereal comes in boxes of different sizes.the regular box holds 7/8 pounds.the small box holds 2/3 as much. How much cereal does the small box hold?

*May 2, 2011*

**physics**

A skier of mass 72 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 65 m up a 30° slope (assumed frictionless) at a constant speed of 2.7 m/s? (b) What power must a motor have to perform this task?

*March 20, 2011*

**chemistry**

What is my theoretical yield of iron II chloride if I start with 34 grams of iron II bromide?

*March 13, 2011*

**physics**

Find the height from which you would have to drop a ball so that it would have a speed of 6.6 m/s just before it hits the ground.

*March 11, 2011*

**physics**

A projectile is launched with a speed of 41 m/s at an angle of 55° above the horizontal. Use conservation of energy to find the maximum height reached by the projectile during its flight.

*March 11, 2011*

**physics**

A sledge loaded with bricks has a total mass of 18.9 kg and is pulled at constant speed by a rope inclined at 19.3° above the horizontal. The sledge moves a distance of 19.8 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0...

*March 9, 2011*

**physics**

A child and sled with a combined mass of 50.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 3.40 m/s at the bottom, what is the height of the hill?

*March 9, 2011*

**physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.5 m/s as in the figure below. If his speed is 27.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.

*March 9, 2011*

**4th grade math**

I dont know

*March 7, 2011*

**heart**

how long does it take to design, test, and get FDA approval of an artificial heart valve?

*February 21, 2011*

**Relative Acidities**

Rank the given compounds on their relative acidity. Here was the order I thought it was but it turned out to be wrong. (i based it based off of sp being most acidic and sp3 being least acidic) STRONGEST HC(triple bond)C-CH3 H2C=CH2 CH3NH2 H2O CH4--> WEAKEST and then I ...

*February 16, 2011*

**ochem**

list from strongest acid to weakest acid HC(triple bond)CCH3 H2C=CH2 H3CNH2 CH4 H2O i thought the order went HC(triple)CCH3 H3CNH2 H2O H2C=CH2 CH4 but it comes out as wrong and i dont know why >

*February 14, 2011*

**Biology- DNA**

What is needed to synthesize DNA? -a DNA strand -a primer and is that it?

*February 7, 2011*

**Complex Numbers**

Oh thank you so much i forgot that when you that the square root of a negative you get the complex #

*January 31, 2011*

**Complex Numbers**

How do I go about finding the solutions to the following x^2-6x+25=0 I know the answer is 3-4i and 3+4i however, I do not know how to go about finding the these solutions Thanks :)

*January 31, 2011*

**Math**

of the 43 presidents 15 were elected to 2 terms. what fraction of us presidents were elected two terms? HELP! I have been at this one for over two hours and I can't come up with the answer.

*January 9, 2011*

**bio**

according to Stephens, when are learning behaviors expected to evolve?

*December 17, 2010*

**math**

find the slope and y-intercept of the line in the given equation: y=6/7x-4

*December 16, 2010*

**math**

Thank you.

*December 16, 2010*

**math**

Given the linear equation y=-3/2x+1, find the y-coordinates of the points (-4), (-2), and (6). Please show all of your work. Plot those points and graph the linear equation.

*December 16, 2010*

**bio**

What is the grandmother effect in humans? what is the grandfather effect?

*December 15, 2010*

**bio**

what is the sociobiology controbersy?

*December 15, 2010*

**Calculus**

What's the practical domain and range of this volume function: 4x^3-39x^2+93.5x

*December 15, 2010*

**math**

solve v=(1/3)t+12

*December 12, 2010*

**bio**

what is prey flushing?

*December 9, 2010*

**bio**

what is the edge effect? (as part of group living)

*December 9, 2010*

**science- chemistry**

How much energy in kilojoules is needed to heat 5.00 g of ice from -10.0 C to 30.0 C ?

*December 7, 2010*

**Spanish 1**

Use the cues below to write sentences with the verb GUSTAR. MODELO: comida italiana/Vilma = A Vilma le gusta la comida italiana. 1) quien/los animales 3) quienes/la musica

*November 29, 2010*

**Spanish 1**

A spanish exchange student is trying to figure out what his friends like to eat. Provide the correct pronoun forms to complete his sentences below.: ____ gusta la comida china. A Patricia y a Juan ____ gusta la comida mexicana. ¿A vosotros ____ gusta la comida italian? ...

*November 29, 2010*

**bio**

what is an example of a naturally fragmented habitat, and a habitat that has been fragmented by human land use?

*November 29, 2010*

**ecology**

what is the atlantic pahtway? and why does its path through upstate New York raise special conservation concerns for woodlands and wetlands on the south side of Lake Ontario?

*November 29, 2010*

**math**

3a+8=15-(9a-9)

*November 3, 2010*

**world history**

I was wondering how to spell Ida Peeiffer I mean like this lady couldn't even find it on the internet how crazy is that.

*November 1, 2010*

**math**

Use Descarte's rule of signs to discuss the possibilities for the roots of the equation. Do not solve the equation -5r^(4)+6r^(3)+9r-15=0

*October 26, 2010*

**math**

Use the rational zero theorem, Descartes rule of signs, and the theorem on bounds as aids in finding all real and imaginary roots to the following equation: 4x^(3)-17x^(2)+16=0

*October 25, 2010*

**math**

solve the equation for all real and imaginary solutions (x-3/2)^2-2(x-3/2)+26=0

*October 21, 2010*

**math**

Find all real solutions: sqrt(x+10)+ sqrt(x-1)=11

*October 21, 2010*

**chemistry**

If the decomposition of 3.785 g iron (III) chloride yields 1.302 g iron and 2.483 g chlorine, how many grams of iron and chlorine are produced when 2.175 g iron (III) chloride decomposes?

*September 29, 2010*

**Math, I have partial answer..**

Find the vertex for f(X)=-x^2+8x+6 I came up with (4,22)but i'm not sure. If so, what is the line of symmetry?

*September 24, 2010*

**word problem**

Thank you, Ms. Sue....I had the right concept but was stuck in the last part... Allie

*September 24, 2010*

**Math word problem**

The hypotenuse of a right triangle is 22 m long. The length of one leg is 10 m less than the other. Find the lengths of the legs. I have so far let one leg be x the other leg will be x-10 x^2 +(x-10)^2=22^2 x^2+x^2-20x+100=484

*September 24, 2010*

**health**

What are the ethicl considerations in obtaining a persons DNA?

*September 21, 2010*

**Math, plz help**

How do I write a quadratic equation having the given numbers as solutions of -9 and 3

*September 17, 2010*

**Math**

This question is in my FLVS test.... and i have NO idea. O_O"

*August 20, 2010*

**Chemistry **

The reaction below shows the corrosion process of iron. Calculate E°cell for the corrosion process and state whether you would predict that this is a spontaneous or nonspontaneous process. 2 Fe (s) + O2 (g) + 4 H+ (aq) → 2 Fe2+ (aq) + 2 H2O (l)

*August 8, 2010*

**Chemistry **

Calculate ΔG at 298 K for the electrochemical cell consisting of Au metal in a 0.00500 M Au(NO3)3 solution and Cu metal in a 0.950 M Cu(NO3)2 solution.

*August 8, 2010*

**Critical Thinking 205**

Thank you I didn't ask the question right. Which one of the 3 is the best?

*May 8, 2010*

**Critical Thinking 205**

which one of these make an argument the best? Which one of these is the weakest? Or how are the terms used in arguments? Here are the terms - Valid/ Invalid, -Sound/ Unsound, -Strong/ Weak

*May 8, 2010*

**chemistry**

how much heat dows a 23.0g ice cube absorb as its temp increases from -17.4deg C to 0.0deg C?

*April 29, 2010*

**AP Chemistry **

I came up with 6.67 x 10^-3 g solute/ 100g solvent. Based on the information in the problem, does this seem about right?

*April 21, 2010*

**AP Chemistry **

The question asked... Calculate the solubility of calcium sulfate in grams solute per 100 grams solvent. Assume that the volume occupied by the solute in the solution in negligibly small. I solved and got 4.9 x 10 ^-3 mol/L... how do I put this in grams solute per 100 grams ...

*April 21, 2010*

**Math**

Answer to question 2 about credit card debt in the US is RIGHT SKEWED.

*April 15, 2010*

**Math**

a ladder 10 ft long rests against a vertical wal. if the bottom of the ladder slides away from the wall at a rate of 0.7 ft/s, how fast&...

*March 29, 2010*

**chemistry**

Assume you are performing the calibration step of Experiment 8 and you begin with 50 g of water at 20 oC and 50 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...

*March 10, 2010*

**chemistry**

The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.500C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol . How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 263.0 grams of diethyl ether to raise the ...

*January 31, 2010*

**chemistry**

The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.500C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol . How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 263.0 grams of diethyl ether to raise the ...

*January 31, 2010*

**physics**

A mass is hung from a beam of weight 2.0 N and length 81 cm. The tension and angle of the cable supporting the beam is 5.0 N at an angle of 40° from the horizontal. Using torques produced calculate the value of the unknown mass.

*November 24, 2009*

**Chemistry**

About twenty radioisotopes with ultra-long half-lives, from 82 million years (244- Plutonium) to 6 million billion years (50-Vanadium) are found in the earth’s crust, yet no radioisotopes with half-lives less than 70 million years (146- Samarium) are found. Why not? Use ...

*November 16, 2009*

**chemistry**

Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each Al atom has a radius of 1.43 angstroms, what is the length of a side of the unit cell?

*October 20, 2009*

**History**

After the Treaty of Paris, what policy changes did Britain make for the colonies?

*September 2, 2009*

**math**

Find the slope, x-intercept, and y-intercept for the line 9 x + 10 y + 16 = 0 I found y to be -1.6, the slope to be -.9 and x to be wither 0/9 or -16 but it said i got x wrong

*September 1, 2009*

**science**

a person who deals with the atmosphere and its phenomena, including weather and climate.

*September 1, 2009*

**math**

1. The equation, in general form, of the line that passes through the point (3,4) and is perpendicular to the line 5 x + 5 y + 9 = 0 is Ax + By + C = 0, where a=? b=? c=? 2.The equation of the line that goes through the points ( -9 ,-6 ) and ( -6 ,-3 ) can be written in ...

*August 30, 2009*

**physics**

omg i had the same question jason says your right he found the answer in the text book

*June 3, 2009*

**Reimbursement Methodologies**

You're the new director of a hospital health information management department. The chief financial officer has hired you for your expertise in health care reimbursement and needs to know how your department can help with reimburement. List the mot impotant functions of ...

*May 25, 2009*

**reading**

brother is to mother as fly is to

*May 12, 2009*

**Types of Business writing**

write an email of 6-10 sentences based on the scenario described here. Your boss has asked you to set up a meeting with a client for next week thursday. He wants to meet at the Miami Beach resort on Collins ave. He is taking along an assistant manager to share his ideas for ...

*April 10, 2009*

**math**

810,000

*March 25, 2009*

**Rounding (math)**

780,000

*March 25, 2009*

**algebra**

Reduce to lowest terms 3x-6/x^2-4x+4 perform operation w^2-1/(w-1)2 times w-1/w^2+2w+1 Find LCD and convert rational express. to equivalent rat. exp. with LCD as the denominator: 4/a-6 , 5/6-a

*February 2, 2009*

**social studies**

how old was john adams when he first went to school a)4 b)5 c)6 d)7

*January 8, 2009*

**socail studies**

ok this is the question jefferson believed that the creation of a national bank was a)unconstitutional b)faction c)democratic republicans d)federalist

*January 7, 2009*

**socail studies**

how old was john adams when he first went to school

*January 7, 2009*

**socal studies**

what was hamilton and his supporters called

*January 7, 2009*

**pre-calc**

what does this simplify to: f(x)=x/(x+4)^(1/5)-2

*January 4, 2009*

**pre-calc**

how would you solve x^(5/2)(x^(1/2)- 1/x^(1/2))

*November 20, 2008*